The effect of temperature and pressure on excess electron mobility in n-hexane, 2,2,4-trimethylpentane, and tetramethylsilane

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Abstract
Measurements of excess electron mobility are reported for liquid n‐hexane, 2,2,4‐trimethylpentane, and tetramethylsilane for pressures from 1 to 2500 bar and for temperatures from 18 to 120 °C. For tetramethylsilane, a liquid that exhibits a high electron mobility, the mobility at constant density is proportional to T−0.9 between 25 and 100 °C. The results are compared with the Basak–Cohen deformation potential theory. For n‐hexane, where the mobility is low, Arrhenius behavior is observed. The isochoric activation energy increases with density. The results in this case are consistent with both the two‐state and hopping models. In 2,2,4‐trimethylpentane the mobility increases with increasing pressure at room temperature and decreases at high temperature. At 2500 bar and at intermediate temperatures (70–80 °C) the mobility is approximately constant.