Negative ion photodetachment and the electron effective mass in liquids
Negative ion photodetachment and the electron effective mass in liquids
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负离子光脱离和液体中的电子有效质量
DOI：
10.1063/1.445524
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发表时间：
1983
影响因子：
4.4
通讯作者：
J. Baird
中科院分区：
文献类型：
--
作者：
J. Baird
气相中的负离子的电子光剥离截面与相同离子的光剥离截面进行比较，当它溶解在支持“自由”电子传播的液体中。阈值附近的这两个横截面的振幅的比率被发现依赖于液体的导带中的电子的有效质量m*。我们将这个结果应用于O−2的电子光剥离。根据电子的自由质量m，我们发现液态氩在87 K（m*=0.26 m），2，2-二甲基丁烷在296 K（m*=0.27 m），2，2，4-三甲基戊烷在296 K（m*=0.27 m），四甲基硅烷在296 K（m*=0.27 m）。在200 K下，四甲基硅烷中的有效质量降低到m*=0.21 m。在液态氩的情况下，这里计算的有效质量同意定性的值，可以从测量的电子迁移率和激子光谱估计。
The electron photodetachment cross section for a negative ion in the gas phase is compared with the photodetachment cross section for the same ion when it is dissolved in a liquid supporting ‘‘free’’ electron propagation. The ratio of the amplitudes of these two cross sections near threshold is found to depend upon the effective mass m* of an electron in the conduction band of the liquid. We apply this result to electron photodetachment from O−2. In terms of the electron’s free mass m, we find for liquid argon at 87 K (m*=0.26 m), 2,2‐dimethylbutane at 296 K (m*=0.27 m), 2,2,4‐trimethylpentane at 296 K (m*=0.27 m), and tetramethylsilane at 296 K (m*=0.27 m). At 200 K, the effective mass in tetramethylsilane decreases to m*=0.21 m. In the case of liquid argon, the effective mass calculated herein agrees qualitatively with values which can be estimated from measurements of the electron mobility and exciton spectrum.