Spin correlation in O(2) chemisorption on Ni(111).
Spin correlation in O(2) chemisorption on Ni(111).
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Ni(111) 上 O(2) 化学吸附的自旋相关性。
DOI：
10.1103/physrevlett.114.016101
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发表时间：
2015
影响因子：
8.6
通讯作者：
Y. Yamauchi
中科院分区：
文献类型：
--
作者：
M. Kurahashi;Y. Yamauchi
分子氧（O（2））是一种顺磁性线性分子，但其电子自旋如何影响化学吸附概率仍不清楚。本文介绍了第一个自旋和自旋分辨的O（2）化学吸附实验，该实验是用一个自旋旋转态选择的O（2）束和磁化的Ni（111）表面进行的。结果表明，当O（2）的自旋方向与Ni衬底的多数自旋方向反平行时，O（2）的粘附几率较高。自旋依赖性在低平移能量下变得更加显著，并且在热能下超过40%。这种强的自旋效应表明，入射的O（2）分子即使在解离势垒的位置也保持高的自旋极化。
Molecular oxygen (O(2)) is a paramagnetic linear molecule, yet how its electron spin affects the chemisorption probability remains unclear. We here present the first spin- and alignment-resolved O(2) chemisorption experiment conducted with a single spin-rotational state-selected O(2) beam and a magnetized Ni(111) surface. The results show that the O(2) sticking probability is higher when its spin is oriented antiparallel to the majority spin direction of the Ni substrate. The spin dependence becomes more significant at low translational energy, and amounts to over 40% at thermal energy. This strong spin effect suggests that incident O(2) molecules keep high spin polarizations even at the position of the dissociation barrier.