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1 Aug 1979

Volume 50, Issue 8, pp. 5093-5557

Page 1 of 4 Pages Next Page | Jump to Page

Deep‐level‐transient spectroscopy: System effects and data analysis

D. S. Day, M. Y. Tsai, B. G. Streetman, and D. V. Lang

J. Appl. Phys. 50, 5093 (1979); http://dx.doi.org/10.1063/1.326665 (6 pages) | Cited 53 times

Online Publication Date: 29 July 2008

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Studies of typical DLTS systems using either the dual‐channel boxcar averager or the lock‐in amplifier techniques are presented. The effects of nonzero gate width for the boxcar averager, phase angle adjustment for the lock‐in amplifier, and response time of a typical commercial capacitance meter are investigated. Errors introduced in the measurements by these effects are calculated for typical cases. Measurements of the gold donor level in silicon are presented, along with calculated corrections. We find the corrections to be minimal in the boxcar‐averager method, but significant in the lock‐in amplifier approach.
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07.05.Hd Data acquisition: hardware and software
07.05.Kf Data analysis: algorithms and implementation; data management
07.05.Rm Data presentation and visualization: algorithms and implementation
07.07.-a General equipment
78.40.Fy Semiconductors
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping

Measurements of the molecular stopping cross sections of organic ring compounds

R. B. Brown and D. Powers

J. Appl. Phys. 50, 5099 (1979); http://dx.doi.org/10.1063/1.326666 (6 pages) | Cited 5 times

Online Publication Date: 29 July 2008

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The molecular stopping cross sections of the organic ring compounds cyclopentane, cyclohexane, cyclooctane, cyclopentene, cyclohexene, 1,3‐cyclohexadiene, benzene, toulene, phenylacetylene, cyclohexanone, and p‐dioxane have been measured for helium ions with energies from 0.3 to 2.0 MeV. It is found that the ring structure of molecules with less than six CH2 groups in the ring as well as the nature of the bonds involved correlate with deviations from Bragg’s rule as great as 14.7%. Evidence of resonance in the ring structure which correlated with the stopping cross section of the compound benzene is also observed. A qualitative relationship between chemical bond strain and deviations from Bragg’s rule is given.
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34.50.-s Scattering of atoms and molecules
34.90.+q Other topics in atomic and molecular collision processes and interactions (restricted to new topics in section 34)

The functional form of energy‐differential cross sections for carbon using transmission electron energy‐loss spectroscopy

D. M. Maher, D. C. Joy, R. F. Egerton, and P. Mochel

J. Appl. Phys. 50, 5105 (1979); http://dx.doi.org/10.1063/1.326667 (5 pages) | Cited 9 times

Online Publication Date: 29 July 2008

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Measurements have been made of the functional form of the energy‐differential cross sections for carbon, using transmission electron energy‐loss spectroscopy. It is shown that both the characteristic K edge and the background, prior to the K edge, can be represented accurately by functions of the form AE−r, where E is the energy loss and A and r are constants. The values of the exponent in this expression for the K edge have been compared with calculated values derived from a hydrogenic model and good agreement has been obtained.
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34.50.Fa Electronic excitation and ionization of atoms (including beam-foil excitation and ionization)
36.40.-c Atomic and molecular clusters
79.20.Kz Other electron-impact emission phenomena
82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)

Investigation of the production of singly charged ions in a rf quadrupole ion trap

H. A. Schuessler and C. H. Holder

J. Appl. Phys. 50, 5110 (1979); http://dx.doi.org/10.1063/1.326591 (5 pages) | Cited 7 times

Online Publication Date: 29 July 2008

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A three‐dimensional rf quadrupole ion trap has been constructed to study ion production by electron‐impact ionization. Gases and atoms in an atomic beam can be investigated. The method can be extended to the study of photon ionization and of the production of multiply charged ions by a single collision and/or by step‐by‐step ionization. Total electron‐impact ionization cross sections of helium have been measured and are σe(350 eV) =0.26(6) ×10−16 cm2 and σe(500 eV) =0.21(4) ×10−16 cm2. Equations are derived to operate the rf ion trap in the symmetric storage mode.
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07.77.-n Atomic, molecular, and charged-particle sources and detectors
37.20.+j Atomic and molecular beam sources and techniques
34.80.Dp Atomic excitation and ionization
29.27.-a Beams in particle accelerators

Electromagnetic interaction between a conducting cylinder and a solenoid in relative motion

James R. Wait and David A. Hill

J. Appl. Phys. 50, 5115 (1979); http://dx.doi.org/10.1063/1.326668 (5 pages) | Cited 1 time

Online Publication Date: 29 July 2008

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An analysis is presented for the mutual impedance between two solenoids that are coaxial with a conducting cylinder in relative motion. The formulation is based on the first‐order Lorentz transformation and the results obtained are sufficiently general to encompass any such situation that could arise in nondestructive‐testing schemes. A numerical example, relevant to steel‐wire ropes of 2‐cm radius used in mine hoists, indicates that even with relative velocities as high as 10 m/s, the mutual impedance at 10 Hz differs little from that calculated for zero velocity. However, the nonreciprocal effects could be significant for higher velocities and/or for more highly conducting and larger ropes.
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03.50.De Classical electromagnetism, Maxwell equations
41.20.Jb Electromagnetic wave propagation; radiowave propagation
84.40.Az Waveguides, transmission lines, striplines
91.25.-r Geomagnetism and paleomagnetism; geoelectricity

The inverse interior Dirichlet problem

J. P. van der Merwe

J. Appl. Phys. 50, 5120 (1979); http://dx.doi.org/10.1063/1.326669 (7 pages) | Cited 7 times

Online Publication Date: 29 July 2008

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An infinite number of rotationally symmetrical functions Ψ (r,z) can be found which approximate a given function f (z) on the optical axis 0z (r and z being cylindrical polar coordinates). The Ψ (r,z) are given in the form of a finite Fourier‐Bessel series and it is shown how a solution that can be used in electron optical design can be selected by carefully assigning values to the following parameters: the number of terms in the series, the period of the series, and the amount of smoothing introduced. In this way a compromise is established between the quality of the axial approximation, the magnitude of potential gradients to be contended with in zonal regions, and the sizes of apertures allowed. Two‐foil, one‐foil, and open lenses can be modeled, and given axial potential functions can be accommodated which are either (i) analytic, (ii) continuous but with piecewise continuous z derivatives, or (iii) in the form of a set of experimentally determined values. The method requires no matrix inversion, the computer programming is of a simple nature, and memory requirements are modest enough to allow implementation of the program on small desk‐top computers.
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41.20.Cv Electrostatics; Poisson and Laplace equations, boundary-value problems
41.20.Gz Magnetostatics; magnetic shielding, magnetic induction, boundary-value problems
02.60.-x Numerical approximation and analysis
02.70.-c Computational techniques; simulations

Enhanced HCl laser power through the addition of CO2

J. Menard, T. Delaporte, and F. Menard‐Bourcin

J. Appl. Phys. 50, 5127 (1979); http://dx.doi.org/10.1063/1.326670 (3 pages) | Cited 2 times

Online Publication Date: 29 July 2008

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The HCl multiline output power of a TE helical laser is enhanced by adding CO2 to the H2+Cl2 mixture. In single‐line operation, the output powers on the vibration‐rotation lines of the (1→0) band can be increased by a factor of 3 as CO2 is added.
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42.55.Lt Gas lasers including excimer and metal-vapor lasers
42.60.By Design of specific laser systems

Pulse shape and laser‐energy extraction from e‐beam‐pumped KrF

J. H. Jacob, J. C. Hsia, J. A. Mangano, and M. Rokni

J. Appl. Phys. 50, 5130 (1979); http://dx.doi.org/10.1063/1.326646 (5 pages) | Cited 24 times

Online Publication Date: 29 July 2008

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See Also: Erratum

Show Abstract
In this paper, detailed comparisons are made between the numerical predictions of a comprehensive KrF kinetics/laser‐model computer code and the experimental results from an e‐beam‐pumped KrF laser. The code and the experimental laser device are described. The inputs to the code are the measured temporally varying e‐beam energy and current density, the laser mixture, the optical‐cavity output coupling, and the optical gain length. Comparisons include laser output power, laser output pulse shape, and KrF∗ fluorescence from the laser‐cavity sidelight under lasing and nonlasing conditions. Using our numerical model, we have generated a scaling map for the KrF∗ laser.
Show PACS
42.60.By Design of specific laser systems
42.55.Lt Gas lasers including excimer and metal-vapor lasers

Nonradiative recombination in GaAlAs proton‐bombarded stripe‐geometry lasers

R. J. Nelson and D. L. Rode

J. Appl. Phys. 50, 5135 (1979); http://dx.doi.org/10.1063/1.326647 (4 pages) | Cited 10 times

Online Publication Date: 29 July 2008

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Nonradiative recombination processes in GaAlAs double‐heterostructure lasers are examined using luminescence time‐response measurements. Photoluminescence time‐decay data for proton‐bombarded (PB) isotype (p‐type) heterostructures give an effective recombination velocity for the PB region of (7±1) ×105 cm/sec. Electroluminescence decay times of laser devices indicate that the interfacial recombination velocity of the anisotype interface (p‐GaAs/N‐GaAlAs) is 1500±500 cm/sec compared with 400±100 cm/sec for isotype (p‐type) interfaces. The contribution of each important recombination process to the laser threshold current is calculated. For devices in which the PB region penetrates into the active layer, recombination in the PB region and interfacial recombination are the major nonradiative paths.
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42.55.Px Semiconductor lasers; laser diodes
42.60.By Design of specific laser systems

Multiwavelength GaAs rib waveguide directional‐coupler switch with ’’stepped Δβ’’ Schottky electrodes

A. Carenco, L. Menigaux, and Ph. Delpech

J. Appl. Phys. 50, 5139 (1979); http://dx.doi.org/10.1063/1.326648 (3 pages) | Cited 4 times

Online Publication Date: 29 July 2008

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An electro‐optic waveguide directional‐coupler switch has been fabricated in GaAs by liquid‐phase epitaxy, photolithography, chemical etching, and electroplating. The Schottky electrodes, overlaying each single‐mode rib waveguide, are cut midway along the device length to allow the electrical optimization of each switching state (’’stepped Δβ’’ configuration) in a wavelength range (1.0–1.3 μm) useful for optical‐fiber communications. The device exhibits good power isolation for both states (at least 19 dB and up to 32 dB) with reverse driving voltages of less than 30 V, at 1.06, 1.15, and 1.32 μm. Both states have been obtained at 1.06 μm by switching one single voltage, a convenient way in spite of some power penalty to take full advantage of the large potential bandwidth (1 GHz) of the switch.
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42.79.Hp Optical processors, correlators, and modulators
42.79.Gn Optical waveguides and couplers
42.79.Sz Optical communication systems, multiplexers, and demultiplexers
78.20.Jq Electro-optical effects

Illumination and energy deposition in a multibeam laser‐fusion system

A. J. Scannapieco and H. Brysk

J. Appl. Phys. 50, 5142 (1979); http://dx.doi.org/10.1063/1.326649 (8 pages) | Cited 2 times

Online Publication Date: 29 July 2008

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Calculations are presented for multibeam laser‐fusion systems illuminating spherical targets. Both the illumination pattern and the energy deposition on the surface of the target are obtained, with the beam focus in general displaced from the center of the target. The absorptivity (which depends on angle of incidence and polarization) is discussed from experimental and theoretical evidence. Numerical results are displayed for two LASL laser systems. They illustrate the distinction between the symmetry of the illumination and of the energy deposition. They also demonstrate, as a function of the relative size of the target and of the (finite) focal spot, that the absorption can be enhanced by displacing the beam axis from the center of the target.
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42.62.-b Laser applications
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)

Mirror degradation in AlGaAs double‐heterostructure lasers

H. Yonezu, K. Endo, T. Kamejima, T. Torikai, T. Yuasa, and T. Furuse

J. Appl. Phys. 50, 5150 (1979); http://dx.doi.org/10.1063/1.326650 (8 pages) | Cited 18 times

Online Publication Date: 29 July 2008

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Degradation mechanism and the related change in lasing characteristics for a mirror degradation were investigated in AlGaAs double‐heterostructure lasers with uncoated mirror surfaces. In constant optical‐power operation, mirror degradation was classified into three phases. The lasing‐characteristics degradation in the initial stage of phase I was well explained in the excitation‐enhanced oxidation model. Dark‐line defects, originating from mirror surfaces, were found in the final stage of phase III, following phase II with a low degradation rate. The mechanism of the optical‐power dependence was also investigated. Marked improvement in operating life was confirmed by the dielectric film coating and in a new‐structure laser with little excitation in the vicinity of mirror surfaces.
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42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
42.60.By Design of specific laser systems

Stimulated Raman scattering by an intense relativistic electron beam subjected to a rippled electric field

G. Bekefi and R. E. Shefer

J. Appl. Phys. 50, 5158 (1979); http://dx.doi.org/10.1063/1.326651 (7 pages) | Cited 20 times

Online Publication Date: 29 July 2008

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Generation of submillimeter radiation by stimulated Raman scattering in an intense relativistic electron beam subjected to a spatially periodic transverse electric field is examined. The requisite electric field modulation can be obtained by rippling the wall of the conducting drift tube. When the electron beam is subjected to a periodic longitudinal electric field, short‐wavelength plasmons, rather than photons, are generated. The growth rate and other parameters related to this instability are discussed.
Show PACS
42.65.Dr Stimulated Raman scattering; CARS
42.65.Es Stimulated Brillouin and Rayleigh scattering
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
52.35.Mw Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)
52.25.Os Emission, absorption, and scattering of electromagnetic radiation

Channeled‐substrate‐planar‐structure semiconductor lasers with lateral‐evanescent‐field distributed feedback

W. T. Tsang, R. A. Logan, and L. F. Johnson

J. Appl. Phys. 50, 5165 (1979); http://dx.doi.org/10.1063/1.326652 (3 pages) | Cited 5 times

Online Publication Date: 29 July 2008

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GaAs‐AlxGa1−xAs channeled‐substrate‐planar‐structure lasers with lateral‐evanescent‐field distributed feedback are fabricated by using one‐step liquid‐phase epitaxy. The diodes operate stably in single‐transverse (fundamental) and longitudinal modes at room temperature under pulsed operation.
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42.55.Px Semiconductor lasers; laser diodes
42.79.Sz Optical communication systems, multiplexers, and demultiplexers
73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions

Electrical and laser diagnostics of an 80‐kW supersonic cw CO electric laser

E. L. Klosterman and S. R. Byron

J. Appl. Phys. 50, 5168 (1979); http://dx.doi.org/10.1063/1.326653 (8 pages) | Cited 8 times

Online Publication Date: 29 July 2008

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Detailed spatial and time‐dependent measurements of the electrical parameters and the gas properties have been made on a high‐average‐power quasisteady supersonic cw carbon monoxide electron‐beam‐stabilized electric‐discharge laser. The electrical and optical measurements show that there are major changes in the current‐density distribution and in the supersonic flow field due to the high electric‐discharge power input to the gas. A multipin resistor‐ballasted electrode has been used to make the current density much more uniform, resulting in a factor‐of‐2 increase in electrical energy input and in laser power output. Small‐signal gain measurements were made on the J=7 to J=13 rotational lines of the V=7 to V=6 CO vibrational transition at various locations in the electrical discharge. The measured rotational temperature showed that only 12% of the discharge power went into gas heating in the supersonic free‐stream region. The measured small‐signal gain was as high as 0.08 cm−1, the maximum electrical energy density input was 430 J/l amagat, and the maximum laser power density extracted was 120 kW/l.
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42.55.Lt Gas lasers including excimer and metal-vapor lasers
51.50.+v Electrical properties (ionization, breakdown, electron and ion mobility, etc.)
47.27.-i Turbulent flows

Temperature control of multiline oscillation of a TEA CO2 laser

A. Endoh, T. Sato, S. Watanabe, and H. Kashiwagi

J. Appl. Phys. 50, 5176 (1979); http://dx.doi.org/10.1063/1.326654 (3 pages) | Cited 8 times

Online Publication Date: 29 July 2008

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Irtran‐2 and ZnSe were used as temperature‐controlled etalons to generate multiline oscillation of a TEA CO2 laser. Different combinations of multilines of the 10.6‐μm band were obtained with good reproducibility by temperature controlling these etalons in the laser cavity.
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42.55.Lt Gas lasers including excimer and metal-vapor lasers

Experimental aspects of the Born approximation theory for elastic‐wave scattering from flaw

K. D. Lewis and Laszlo Adler

J. Appl. Phys. 50, 5179 (1979); http://dx.doi.org/10.1063/1.326655 (10 pages) | Cited 2 times

Online Publication Date: 29 July 2008

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In order to study ultrasonic‐wave scattering from hidden defects in metals an experimental system was developed to study the relationships between the various parameters of the scattered field and the scattering centers. Experimental results were analyzed based on Born approximation theory recently developed for elastic‐wave scattering [J.E. Gubernatis, E. Domany, and J.A. Krumhansl, J. Appl. Phys. 48, 2804–2811 (1977); 48, 2812 (1977)]. For an incident longitudinal wave the scattered longintudinal and shear waves from various shapes and sizes of ellipsoidal cavities in titanium were analyzed. It appears that the Born approximation theory agrees reasonably well with experiment.
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43.20.Fn Scattering of acoustic waves
62.30.+d Mechanical and elastic waves; vibrations
81.70.-q Methods of materials testing and analysis

The infinite planar baffles problem in acoustic radiation and its experimental verification

B. Delannoy, H. Lasota, C. Bruneel, R. Torguet, and E. Bridoux

J. Appl. Phys. 50, 5189 (1979); http://dx.doi.org/10.1063/1.326656 (7 pages) | Cited 8 times

Online Publication Date: 29 July 2008

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In acoustics, the analysis of pressure distribution in a field of surface sources is most frequently performed using the assumption that the source constitutes a part of an infinite planar rigid baffle (Rayleigh’s approximation). However, in many practical cases of ultrasonic echography, assumption of a soft pressure‐release baffle (the Rayleigh‐Sommerfeld approximation) or of free‐field conditions (the Kirchhoff approximation) seemed to be better matched to real conditions. A theoretical survey of the planar baffles problem is given in this paper, and its practical aspects in acoustic source radiation are discussed. Some experiments, showing the influence of different boundary conditions onto radiation patterns, verify the theoretical predictions.
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43.20.Rz Steady-state radiation from sources, impedance, radiation patterns, boundary element methods
43.38.Ja Loudspeakers and horns, practical sound sources

A velocity interferometer technique to determine shear‐wave particle velocity in shock‐loaded solids

L. C. Chhabildas, H. J. Sutherland, and J. R. Asay

J. Appl. Phys. 50, 5196 (1979); http://dx.doi.org/10.1063/1.326657 (6 pages) | Cited 15 times

Online Publication Date: 29 July 2008

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An optical technique is described which uses velocity interferometers to determine the large particle velocity changes associated with plane shear‐wave propagation. In this technique two velocity interferometers are used to monitor different diffracted laser beams from a surface which undergoes both longitudinal and shear motion. Fringes produced in the interferometer are proportional to a linear combination of both the longitudinal and shear components of the free‐surface velocity. The technique has been used successfully to monitor the free‐surface velocity of a Y‐cut quartz specimen impacted by an X‐cut quartz plate. Although the present shear‐wave velocity profiles are limited to an accuracy of ±10%, the accuracy can be easily increased by an order of magnitude by using longer delay legs and larger diffraction angles.
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46.40.Cd Mechanical wave propagation (including diffraction, scattering, and dispersion)
46.40.Jj Aeroelasticity and hydroelasticity
62.50.-p High-pressure effects in solids and liquids
62.30.+d Mechanical and elastic waves; vibrations

Transient surface heating of metals by CO2 laser pulses with air‐plasma ignition

J. A. McKay and J. T. Schriempf

J. Appl. Phys. 50, 5202 (1979); http://dx.doi.org/10.1063/1.326658 (4 pages) | Cited 3 times

Online Publication Date: 29 July 2008

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The ignition of an air plasma by a laser pulse at the surface of a metal target may yield a large increase in the heat deposition in the target. The target surface temperature during the pulse is determined by the thermal flux from the plasma, rather than the laser‐pulse parameters. The plasma prevents direct observation of the surface temperature. We show how the surface temperature can be calculated using plasma thermal‐coupling models based on thermal conduction from a radially expanding plasma (due to Robin) and on thermal emission from a axially propagating plasma. The two unknown parameters of the models, the thermal‐coupling coefficient and the propagation or expansion speed, can be evaluated with simple measurements of the total heat and spot‐center thermal fluence depositions. The model calculations are applied to an experimental example using a 137‐J 30‐μs CO2 laser pulse. No discrepancy between the calculated peak surface temperatures and the observed absence of surface melting is found. The calculated values of plasma propagation and expansion speed are in fair agreement with the observed plasma development early in the pulse. The models therefore appear to be reliable for calculation of the surface thermal transient.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
79.20.Ds Laser-beam impact phenomena

Self‐generated magnetic field in CO2‐laser‐produced plasma

Y. Kitagawa, Aye Thein, Y. Yamada, M. Yokoyama, and C. Yamanaka

J. Appl. Phys. 50, 5206 (1979); http://dx.doi.org/10.1063/1.326659 (4 pages) | Cited 2 times

Online Publication Date: 29 July 2008

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Measurements have been made of an azimuthal magnetic field spontaneously associated with plasma produced by the irradiation of a CD2 target by an 80‐ns CO2‐laser pulse. The magnetic field diffuses from an initial source into an ambient nitrogen plasma. Extrapolation of measured data to the initial target surface shows a field intensity of ∼0.6 MG. The diffusion coefficient calculated from the ambient plasma parameters is in accordance with direct experimental data. The diffused field is followed by the expanding laser target plasma. For sufficiently high ambient gas pressure, the field direction is reversed.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.70.Ds Electric and magnetic measurements

In situ Auger electron spectroscopy of Si and SiO2 surfaces plasma etched in CF4‐H2 glow discharges

J. W. Coburn

J. Appl. Phys. 50, 5210 (1979); http://dx.doi.org/10.1063/1.326660 (4 pages) | Cited 43 times

Online Publication Date: 29 July 2008

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In situ Auger electron spectroscopy has been combined with in situ etch‐rate measurements, using quartz crystal microbalances, to study the plasma etching of Si and SiO2 surfaces rf biased at −100 V in CF4‐H2 glow discharges. More carbon deposition was observed on the Si surface relative to the SiO2 surface as hydrogen was added to the CF4 plasma. This observation is consistent with a previously suggested model for the large SiO2‐to‐Si etch‐rate ratios observed in CF4‐H2 discharges.
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52.40.Hf Plasma-material interactions; boundary layer effects
79.20.Rf Atomic, molecular, and ion beam impact and interactions with surfaces
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces

Closed‐form solution for transient reflection from a lossy plasma half‐space for TM polarization

Bo?idar V. Stanić and Milo? M. Skorić

J. Appl. Phys. 50, 5214 (1979); http://dx.doi.org/10.1063/1.326661 (5 pages) | Cited 1 time

Online Publication Date: 29 July 2008

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Closed‐form solution for transient reflection from an isotropic cold lossy plasma half‐space for TM‐type polarization is obtained in the form of an infinite power series of a modified Bessel function of the first kind. The delta, unit step, and rectangular pulse excitations were considered. The obtained results are valid for an arbitrary value of the lossy parameter αν=ν/ωp≳0. Numerical results are presented to illustrate the effects of the incident angle and lossy parameter on the reflected waveform. Early time response at the incident angle ϑi=π/4 is related to the time‐domain Brewster angle.
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52.40.Db Electromagnetic (nonlaser) radiation interactions with plasma
52.70.Kz Optical (ultraviolet, visible, infrared) measurements

Cross polarization of EM waves scattered by an isotropic inhomogeneous moving plasma column

Ljiljana R. Cander and Bo?idar V. Stanić

J. Appl. Phys. 50, 5219 (1979); http://dx.doi.org/10.1063/1.326662 (4 pages)

Online Publication Date: 29 July 2008

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Interaction of obliquely incident linearly polarized plane electromagnetic waves with a radially inhomogeneous plasma column of infinite length moving uniformly in the axial direction is treated analytically. It is found that the cross‐polarized field components disappear at the incident angle Φ0=sin−1(vz/c) (vz is the velocity of the moving plasma column and c is the free‐space velocity of light) for the case of an inhomogeneous plasma column with an arbitrary electron density profile. Numerical results for the differential scattering cross sections are obtained for a range of plasma velocities by using the two‐point boundary‐value method.
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52.40.Db Electromagnetic (nonlaser) radiation interactions with plasma
07.60.Fs Polarimeters and ellipsometers

Diagnostics of dense argon plasmas by two‐wavelength optical absorption

M. G. R. Phillips and A. A. Pugatschew

J. Appl. Phys. 50, 5223 (1979); http://dx.doi.org/10.1063/1.326663 (7 pages) | Cited 1 time

Online Publication Date: 29 July 2008

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A diagnostic method using optical absorption at two different wavelengths to determine simultaneously the electron density and temperature in an argon plasma is described. One wavelength is chosen to lie in the continuum, while the other (488 nm) is resonant with a plasma transition. Examples of measurements made in a dense plasma produced by a reflected shock wave are discussed together with the main systematic errors.
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52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.50.Lp Plasma production and heating by shock waves and compression
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