REFERENCE INTERACTION SITE MODEL POLARON THEORY OF ELECTRON-MOBILITY IN FLUIDS

被引:37
作者
HSU, D [1 ]
CHANDLER, D [1 ]
机构
[1] UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720
关键词
D O I
10.1063/1.458646
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The reference interaction site model (RISM)-polaron model of excess electrons in liquids is extended to treat the competition between attractive and repulsive branches of electron-liquid atom pseudopotentials. For certain choices of parameters, a delicate cancellation occurs leading to unusually large values of electron mobility over a narrow range of liquid densities. This behavior has also been observed in experiment. The RISM-polaron theory is used to interpret these experiments. It is shown that because of the topological disorder of a liquid, attractive interactions alone lead to electron localization and no anomalously large mobilities. Similarly, repulsions by themselves do not produce the anomaly. The cancellation that can occur is a manifestation of the quantum nature of electronic states in an annealed random system. Comparison of the present results with those that might follow from a classical percolation model suggests that the latter does not provide a correct description of electron mobilities in liquids. The cancellation is different but analogous to the Ramsauer-Townsend effect. © 1990 American Institute of Physics.
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页码:5075 / 5083
页数:9
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