ROLE OF F-CENTER DIFFUSION IN THE ELECTRON-STIMULATED DESORPTION OF METAL ATOMS FROM ALKALI-HALIDES
ROLE OF F-CENTER DIFFUSION IN THE ELECTRON-STIMULATED DESORPTION OF METAL ATOMS FROM ALKALI-HALIDES
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DOI：
10.1103/physrevlett.57.1781
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发表时间：
1986-10-06
影响因子：
8.6
通讯作者：
TOLK, NH
中科院分区：
文献类型：
--
作者：
LOUBRIEL, GM;GREEN, TA;TOLK, NH
通过对脉冲电子辐照过程中LiF基态中性锂脱附的时间历程的测量，得到了锂脱附机理的新模型。结果表明，电子束产生的向体相F心表面的缓慢扩散是锂脱附大部分时间历程的速率控制因素，而不是金属从表面的热蒸发。比较了理论和实验的时间依赖关系，得到了F心扩散常数及其扩散激活能的值。
Measurements of the time history of ground-state neutral-lithium desorption from LiF during pulsed electron irradiation have resulted in a new model for the lithium desorption mechanism. We show that the slow diffusion to the surface of bulk F centers created by the electron beam is the rate-controlling factor responsible for most of the time history of the lithium desorption rather than the thermal evaporation of the metal from the surface. Comparison between theoretical and experimental time dependences yields values for the F-center diffusion constant and its activation energy for diffusion.