Observations of electron temperature relaxation rates in rare gas afterglow plasmas

Dean, A G; Smith, David; Adams, Nigel G.

doi:10.1088/0022-3700/7/5/016

Cited by 41 publications

(9 citation statements)

References 33 publications

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“…IV B 2, and it will be shown that thermalization times in He-Kr mixtures cannot be appropriately represented by a linear combination of the reciprocals of the thermalization times for pure gases weighted by the corresponding concentrations. For Ne, the present results are in reasonable agreement with other results, except for the experiments of Dean et al 33 and Warman and Sauer. 23 For Ar, the results of Ref.…”

Section: Comparison With Experimental Resultssupporting

confidence: 93%

“…For Kr, the measured ͑ th p͒ value by Dean et al 33 is in excellent agreement with our result for low energy ͑0.1 eV͒. Dean et al 33 also found increasing thermalization time with increasing energy above 0.11 eV, which is in good agreement with present results.…”

Section: Comparison With Experimental Resultssupporting

confidence: 93%

“…This is the usual way the experimental data are presented. 24,27,33 As seen from Fig. 10, energy relaxation at early times cannot be represented by a single exponential function, but rather by a linear combination of a few exponential functions.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

“…21,22 Among the experimental techniques for the determination of thermalization times in rare gases are the measurements of microwave conductivity, 23-29 transient mobility, 11,30 and time delay of recombination luminescence. 31,32 Dean et al 33 used the single Langmuir probe technique in repetitively produced, time-resolved afterglow plasmas. These experiments, having some limitations in each experimental technique used, provide useful results for understanding electron degradation in a medium and for a comparison with theory.…”

Section: Introductionmentioning

confidence: 99%

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Electron thermalization in rare gases and their mixtures

Bronić

Kimura

1996

The Journal of Chemical Physics

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A study of the parallel energy distribution of lost electrons from the central plasma of an electron cyclotron resonance ion source Rev.The time evolution and temperature dependence of electron energy distribution functions ͑EDFs͒ are studied in pure rare gases ͑He, Ne, Ar, Kr, Xe͒ as well as in their mixtures by using solutions of the Boltzmann equation. A clear difference between the gases having the Ramsauer-Townsend ͑RT͒ minimum in the momentum-transfer cross section, ͑RT gases: Ar, Kr, and Xe͒, and those without the RT minimum ͑non-RT gases: He and Ne͒ is pointed out. The influence of the position and the depth of the RT minimum on the EDF and time evolution is studied for three different initial electron energies. A formula proposed for describing thermalization time in a mixture is tested on ͑i͒ a non-RT-non-RT gas mixture, ͑ii͒ a RT-non-RT mixture and ͑iii͒ a RT-RT gas mixture. The linear combination of the reciprocal thermalization times in gas mixture with the component concentrations as weighting factors is found to be valid for gases with a similar energy dependence of the momentum-transfer cross section, m , and also for all rare-gas binary mixtures if the initial electron energy is sufficiently below the RT minimum. Conspicuous deviations from the linear relationship are observed in mixtures of gases whose energy dependence of m ͑or the stopping cross section͒ are different, and theoretical rationales for these findings are provided.

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Section: Comparison With Experimental Resultssupporting

confidence: 93%

Section: Comparison With Experimental Resultssupporting

confidence: 93%

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electron thermalization in rare gases and their mixtures

Bronić

Kimura

1996

The Journal of Chemical Physics

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“…In a series of experiments some years ago, SMITH and co-workers [2-61 carried out detailed studies of rare gas pulsed afterglows, including studies of the relaxation of T, in these media [7,8]. One particular study [7] involved the determination of ambipolar diffusion coefficients (using wall-sampling mass spectrometry) in which unmistakable evidence for the occurrence of diffusion cooling of the electron gas was obtained (see Fig.…”

Section: Introductionmentioning

confidence: 99%

Electron Temperature Relaxation in Afterglow Plasmas: Diffusion Cooling

Trunec

Španěl

Smith

1994

Contrib. Plasma Phys.

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We have carried out a: thorough theoretical analysis of the cooling and heating processes of the electron gas in Ne, Ar and Kr afterglow plasmas. Thus the rate of relaxation of the electron temperature, T,, is seen to be in good agreement with the experimental measurements when spatial gradients of T, in the early afterglow and heating of the electron gas by superelastic collisions between the electrons and metastable atoms are accounted for. At low pressures of the rare gases, pgr the phenomenon of diffusion cooling occurs in which T, relaxes to an equilibrium temperature, T,,, which is less than the gas temperature, T,. This reduction in T,, below is mirrored in a reduction in the ambipolar diffusion coefficient, D,, for the rare gas atomic ions and electrons. Thus the D, can be calculated as a function of p g using the values of T,,, and when this is done, properly accounting for the heating by metastable atoms, the calculated and experimental values of D, in all three rare gas afterglows are seen to be in agreement.

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Studies of Ion-Ion Recombination using Flowing Afterglow Plasmas

Smith

Adams

1983

Physics of Ion-Ion and Electron-Ion Collisions

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Observations of electron temperature relaxation rates in rare gas afterglow plasmas

Cited by 41 publications

References 33 publications

Electron thermalization in rare gases and their mixtures

Electron thermalization in rare gases and their mixtures

Electron Temperature Relaxation in Afterglow Plasmas: Diffusion Cooling

Studies of Ion-Ion Recombination using Flowing Afterglow Plasmas

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