dorsal/arxiv
View SchemaEffect of CH$_{4}$ addition on excess electron mobility in liquid Kr
| Authors | A. F. Borghesani, M. Folegani, P. L. Frabetti, L. Piemontese |
|---|---|
| Categories | |
| ArXiv ID | physics/0202018 |
| URL | https://arxiv.org/abs/physics/0202018 |
| DOI | 10.1063/1.1502251 |
Abstract
The excess electrons mobility $\mu$ has been measured recently in liquid mixtures of Kr and CH$_{4}$ as a function of the electric field up to $E\approx 10^{4} V/cm $ and of the CH$_{4}$ concentration $x$ up to $x \approx 10 % ,$ at temperatures $T\approx 130 K,$ fairly close to the normal boiling point of Kr $(T_{b}\approx 120 K)$(folegani). We present here new data which extend the previous set in the region of low electric field. The experimental results are interpreted in terms of a kinetic model previously proposed to explain the concentration dependent behavior of $\mu$ in liquid Ar--Kr and Ar--Xe mixtures. The main result is that CH$_{4}$ is more effective in enhancing energy--transfer rather than momentum--transfer in comparison with mixtures of liquified noble gases. The field dependence of $\mu$ is quite complicate. In particular, at intermediate values of the field, there appears to be a crossover between two different electric--field dependent behaviors of $\mu.$ The electric field strength at crossover is well correlated with the concentration of CH$_{4}.$ This fact suggests that different excitations of the molecular solute might be involved in the momentum-- and energy--transfer processes for different values of the mean electron energy.
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"abstract": "The excess electrons mobility $\\mu$ has been measured recently in liquid\nmixtures of Kr and CH$_{4}$ as a function of the electric field up to $E\\approx\n10^{4} V/cm $ and of the CH$_{4}$ concentration $x$ up to $x \\approx 10 % ,$ at\ntemperatures $T\\approx 130 K,$ fairly close to the normal boiling point of Kr\n$(T_{b}\\approx 120 K)$(folegani). We present here new data which extend the\nprevious set in the region of low electric field. The experimental results are\ninterpreted in terms of a kinetic model previously proposed to explain the\nconcentration dependent behavior of $\\mu$ in liquid Ar--Kr and Ar--Xe mixtures.\nThe main result is that CH$_{4}$ is more effective in enhancing\nenergy--transfer rather than momentum--transfer in comparison with mixtures of\nliquified noble gases. The field dependence of $\\mu$ is quite complicate. In\nparticular, at intermediate values of the field, there appears to be a\ncrossover between two different electric--field dependent behaviors of $\\mu.$\nThe electric field strength at crossover is well correlated with the\nconcentration of CH$_{4}.$ This fact suggests that different excitations of the\nmolecular solute might be involved in the momentum-- and energy--transfer\nprocesses for different values of the mean electron energy.",
"arxiv_id": "physics/0202018",
"authors": [
"A. F. Borghesani",
"M. Folegani",
"P. L. Frabetti",
"L. Piemontese"
],
"categories": [
"physics.atom-ph",
"physics.chem-ph"
],
"doi": "10.1063/1.1502251",
"title": "Effect of CH$_{4}$ addition on excess electron mobility in liquid Kr",
"url": "https://arxiv.org/abs/physics/0202018"
},
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