Effect of CH$_{4}$ addition on excess electron mobility in liquid Kr
| Autor: | P. L. Frabetti, M. Folegani, A. F. Borghesani, L. Piemontese |
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| Jazyk: | angličtina |
| Rok vydání: | 2002 |
| Předmět: |
Physics
Chemical Physics (physics.chem-ph) Electron mobility Field (physics) Atomic Physics (physics.atom-ph) General Physics and Astronomy Field dependence FOS: Physical sciences Electron Approx Physics - Atomic Physics Momentum Boiling point Electric field Physics - Chemical Physics Physical and Theoretical Chemistry Atomic physics |
| Popis: | 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. Comment: 17, pages,7 figures, RevTeX4, submitted to J.Chem.Phys |
| Databáze: | OpenAIRE |
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