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Electron-stimulated Desorption Of Lithium Ions From Lithium Halide Thin Films

机译:电子刺激下卤化锂薄膜中锂离子的解吸

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Electron-stimulated desorption of positive lithium ions from thin layers of lithium halides deposited onto Si(111) are investigated by the time-of-flight technique. The determined values of isotope effect of the lithium (~6Li~+/~7Li~+) are 1.60 ± 0.04, 1.466 ± 0.007, 1.282 ± 0.004, 1.36 ± 0.01 and 1.33 ± 0.01 for LiH, LiF, LiCl, LiBr and Lil, respectively. The observed most probable kinetic energies of ~7Li~+ are 1.0, 1.9,1.1, 0.9 and 0.9 eV for LiH, LiF, LiCl, LiBr and LiI, respectively, and seem to be independent of the halide component mass. The values of lithium ion emission yield, lithium kinetic energy and lithium isotope effect suggest that the lattice relaxation is only important in the lithium ion desorption process from the LiH system. In view of possible mechanisms and processes involved into lithium ion desorption the obtained results indicate that for LiH, LiCl, LiBr and Lil the ions desorb in a rather classical way. However, for LiF, ion desorption has a more quantum character and the modified wave packet squeezing model has to be taken into account.
机译:通过飞行时间技术研究了正电子锂离子从沉积在Si(111)上的卤化锂薄层中的电子激发脱附。对于LiH,LiF,LiCl,LiBr和Lil,锂(〜6Li〜+ / ~~ 7Li〜+)的同位素效应的确定值为1.60±0.04、1.466±0.007、1.282±0.004、1.36±0.01和1.33±0.01 , 分别。对于LiH,LiF,LiCl,LiBr和LiI,观测到的〜7Li〜+的最可能动能分别为1.0、1.9、1.1、0.9和0.9eV,并且似乎与卤化物的成分无关。锂离子发射产率,锂动能和锂同位素效应的值表明,晶格弛豫仅在LiH系统的锂离子解吸过程中很重要。考虑到涉及锂离子解吸的可能机理和过程,获得的结果表明,对于LiH,LiCl,LiBr和Lil,离子以相当经典的方式解吸。但是,对于LiF,离子解吸具有更多的量子特征,因此必须考虑改进的波包压缩模型。

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