Differences between thermal and laser-induced diffusion.
Differences between thermal and laser-induced diffusion.
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热诱导扩散和激光诱导扩散之间的差异
DOI：
10.1103/physrevlett.114.146104
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发表时间：
2015
影响因子：
8.6
通讯作者：
Karina Morgenstern
中科院分区：
文献类型：
--
作者：
Christopher Zaum;Kastur M. Meyer-auf-der-Heide;Michael Mehlhorn;Steve McDonough;William F. Schneider;Karina Morgenstern
采用飞秒激光激发与低温扫描隧道显微镜相结合的方法，研究了CO在Cu（111）上扩散过程中的远程相互作用。热扩散和激光驱动的扩散都显示出与邻近分子距离的振荡能量依赖。令人惊讶的是，相位是颠倒的；也就是说，在热扩散最困难的距离，激光驱动的扩散最容易，反之亦然。我们解释了这种意想不到的行为，负离子在扩散过程中的瞬态稳定，证实了初步计算。
A combination of femtosecond laser excitation with a low-temperature scanning tunneling microscope is used to study long-range interaction during diffusion of CO on Cu(111). Both thermal and laser-driven diffusion show an oscillatory energy dependence on the distance to neighboring molecules. Surprisingly, the phase is inverted; i.e., at distances at which thermal diffusion is most difficult, it is easiest for laser-driven diffusion and vice versa. We explain this unexpected behavior by a transient stabilization of the negative ion during diffusion as corroborated byab initiocalculations.