Time-resolved two-photon photoemission from Cu(100): Energy dependence of electron relaxation.
Time-resolved two-photon photoemission from Cu(100): Energy dependence of electron relaxation.
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DOI：
10.1103/physrevb.50.8957
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发表时间：
1994-09
期刊：
影响因子：
--
通讯作者：
Schmuttenmaer;Aeschlimann;Elsayed-Ali;Miller;Mantell;Cao;Gao
中科院分区：
文献类型：
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作者：
Schmuttenmaer;Aeschlimann;Elsayed-Ali;Miller;Mantell;Cao;Gao
本文用时间分辨双光子光电子能谱方法测量了单晶Cu（100）表面光激发电子弛豫时间与激发能的关系。的弛豫寿命的激发电子被发现迅速减少的量的费米能级以上的激发能量，我们比较的费米液体理论的基础上计算的测量寿命。结果表明与理论定性一致，并表明由于运输的电子远离表面，并进入散装的影响是重要的。
A time-domain measurement of the relaxation time of photoexcited electrons as a function of excitation energy at a single-crystal Cu(100) surface has been made with time-resolved two-photon photoemission. The relaxation lifetime of the excited electrons is found to decrease rapidly with the amount of excitation energy above the Fermi level, and we compare the measured lifetimes with a calculation based on Fermi-liquid theory. The results reveal a qualitative agreement with the theory, and indicate that effects due to transport of the electrons away from the surface and into the bulk are important.