La mesure de l’énergie moyenne nécessaire pour créer une paire d’ions dans certains liquides isolants

Mathieu, Jacques; Blanc, D.; Caminade, Pierre; Patau, J.P.

doi:10.1051/jcp/1967641679

Cited by 13 publications

(10 citation statements)

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“…According to our simulations, with the same values of initial parameters as those used for the escape probability at zero external field, a secondorder dependence, viz. 0.03 + 2.06 × 10 -3 E -1.72 × 10 -6 E 2 , where E is the strength of the external field in kilovolts per centimeter, gives an excellent agreement with the experimental data in n-hexane 37,41 up to the highest available field strength (160 kV/cm).…”

Section: Resultssupporting

confidence: 69%

“…Other parameters, such as R 0 , E 0 , and L can be adjusted a little, but not a great deal without wholesale disagreement with experiments. 20,22,23,30,37,39 This aspect has been verified by extensive Monte Carlo simulations. 19 Figure 7 shows the escape probability from geminate recombination in n-hexane as a function of temperature over the interval 290-370 K, as obtained from the free-ion yield measurement by Schmidt and Allen using low-LET irradiation and the clearing field technique.…”

Section: Resultsmentioning

confidence: 65%

“…37 For higher fields, the functions g 1 (r) and g 2 (r) would be required to compare the calculations with experiment. 37 Earlier calculations 29,38 did not consider the field effect on the ETDD and at least in one case 29 overestimated the escape probability at very high fields.…”

Section: Resultsmentioning

confidence: 99%

“…For example, it has been known that an altogether unreasonable track model at low LET can give good agreement with experiment by parametric adjustment. 37 Therefore, our aim has been to present a theoretical model for the ETDD which captures the essential physics of the problem correctly, while paying due attention to experimental agreement. In this respect, it should be pointed out that only the parameter k, the ratio of inelastic to elastic collision probabilities, is truly adjustable.…”

Section: Resultsmentioning

confidence: 99%

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Monte Carlo Simulation of Electron Thermalization Distribution in Liquid Hydrocarbons: Effects of Inverse Collisions and of an External Electric Field

Rassolov

Mozumder

2001

J. Phys. Chem. B

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A Monte Carlo simulation has been developed for electron thermalization in a liquid hydrocarbon taking n-hexane as a paradigm. For the first time, both the effect of the geminate cation and that of an external electric field have been included in the predicted electron thermalization distance distribution (ETDD). Also for the first time, both energy losing (direct) and energy gaining (inverse) collisions of the epithermal electron are included in a manner that ensures the equality of their rates, averaged over the Maxwellian distribution, in the long-time limit. Parametric values have been rationalized from the experimental data. Comparison with a free-ion yield experiment in n-hexane at 300 K indicates that about one-third of total epithermal collisions involve the energy exchange of quanta related to intermolecular motion. These energy exchange collisions partition between energy losing to energy gaining processes approximately as 3:2 in the initial stage of thermalization. The important features of the ETDD are displacement from the origin and an exponential tail for which rationalization has been provided. Distortion of the ETDD by an external field does not affect the free-ion yield in the first order; in the second order, an effect quadratic in the field may be seen.

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Section: Resultssupporting

confidence: 69%

Section: Resultsmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Monte Carlo Simulation of Electron Thermalization Distribution in Liquid Hydrocarbons: Effects of Inverse Collisions and of an External Electric Field

Rassolov

Mozumder

2001

J. Phys. Chem. B

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“…The presence of an external electric field can cause the decrease in I 3 in some liquids 4,12,13 and polymers. 5,14,15 These experimental results have been interpreted in terms of the Ore gap model or Spur model.…”

Section: Resultsmentioning

confidence: 99%

The buildup of the electric field during positron annihilation lifetime spectroscopy measurement

et al. 2001

J. Polym. Sci. B Polym. Phys.

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Positron annihilation lifetime spectra were measured on pure polystyrene (PS) and PS samples whose film surfaces were coated with gold, graphite (GR‐PS), or MoS2. The results showed the longest lifetime remained constant with measured time in all experimental samples, whereas the corresponding intensity decreased with time at different rates. The experimental phenomena were associated with the buildup of an electric field inside the polymer during extended positron annihilation lifetime spectroscopy (PALS) measurement. The decrease in the rate was attributed to the presence of conductive film causing the neutrality between positive charges and negative charges, thereby reducing the buildup of the electric field. Additionally, we also performed PALS measurement on GR‐PS under different experimental conditions, such as the conductive film being grounded or not grounded or the presence of an external electric field. These results further indicated that the buildup of the electric field was responsible for the decrease in the intensity with time. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 39: 332–336, 2001

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Effect of an external electric field on the positronium formation in the positron spur

Mogensen¹

1975

Appl. Phys.

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La mesure de l’énergie moyenne nécessaire pour créer une paire d’ions dans certains liquides isolants

Cited by 13 publications

References 0 publications

Monte Carlo Simulation of Electron Thermalization Distribution in Liquid Hydrocarbons: Effects of Inverse Collisions and of an External Electric Field

Monte Carlo Simulation of Electron Thermalization Distribution in Liquid Hydrocarbons: Effects of Inverse Collisions and of an External Electric Field

The buildup of the electric field during positron annihilation lifetime spectroscopy measurement

Effect of an external electric field on the positronium formation in the positron spur

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