Circular Dichroism and Spin Polarization in Photoemission from Adsorbates and Non-Magnetic Solids
Circular Dichroism and Spin Polarization in Photoemission from Adsorbates and Non-Magnetic Solids
复制标题
吸附物和非磁性固体光电发射中的圆二色性和自旋偏振
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
G. Schönhense
中科院分区：
文献类型：
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作者：
G. Schönhense
自旋分辨技术在光电子发射目前吸引了广泛的兴趣，因为它们可以提供一个详细的洞察到电子结构的具体方面和动力学的光激发过程。最近在非磁性系统领域的实验工作进行了审查，重点是利用光子和/或电子自旋所获得的信息的互补性。圆二色性（CDAD）在光电子角分布中的验证是一个很有前途的成果。它是通过末态分波的干涉而产生的，没有自旋-轨道相互作用。每个对准或定向的目标（分子吸附物，单晶）原则上应该在圆偏振光的光电发射中显示出这种效应。光电子发射中的电子自旋极化（ESP）是由圆偏振光诱导的，是自旋轨道相互作用的直接结果。因此，这种类型的光谱提供了一种独特的方法来确定高Z材料的电子带的对称性。这两个类别的最近的例子进行了讨论。
Spin-resolving techniques in photoemission are presently attracting wide interest because they can provide a detailed insight into specific aspects of electronic structure and the dynamics of the photoexcitation process. Recent experimental work in the field of non-magnetic systems is reviewed with emphasis on the complementary nature of the information gained by exploiting the photon- and/or electron-spin. A very promising achievement is the verification of circular dichroism (CDAD) in the angular distribution of photoelectrons. It arises without spin-orbit interaction through an interference of final-state partial waves. Every aligned or oriented target (molecular adsorbates, single crystals) should in principle show this effect in photoemission with circularly polarized light. Electron-spin polarization (ESP) in photoemission is induced by circularly polarized light as a direct consequence of spin-orbit interaction. This type of spectroscopy thus provides a unique method for determining the symmetries of electronic bands of high-Z materials. Recent examples of both categories are discussed.