Electron dichroism - new data and an experimental cross-check
Electron dichroism - new data and an experimental cross-check
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电子二色性 - 新数据和实验交叉检查
DOI：
10.1088/0953-4075/30/23/014
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
J. Kessler
中科院分区：
文献类型：
--
作者：
C. Nolting;S. Mayer;J. Kessler
在0.5-10.0 eV的电子能量范围内，研究了极化电子束通过手性分子蒸气的自旋相关衰减。为了获得关于自旋-轨道相互作用在电子二向色性(ED)中的作用的信息，使用了几个含有至少一个高原子序数的目标分子。结果表明，对于具有一个重原子的完全不同的物质，ED具有相同的数量级，而具有两个重原子的分子不一定表现出更强的ED。一些结果表明，能级随重原子Z的增大而增大。在某些情况下，传输不对称性在总截面发生共振的能量处达到最大值。在第二个实验中，研究表明，未极化的电子束在通过溴樟脑蒸气时，会发生纵向极化。正如理论预测的那样，这种偏振值和测量的传输不对称性彼此对应。
The spin-dependent attenuation of polarized electron beams transmitted through the vapour of chiral molecules was investigated in the electron energy range 0.5 - 10.0 eV. Several target molecules containing at least one atom of high atomic number were used in order to gain information about the role of the spin - orbit interaction in electron dichroism (ED). The results show that for quite different substances with one heavy atom the ED is of the same order of magnitude and that molecules with two heavy atoms do not necessarily show stronger ED. Some of the results indicate that the ED grows with increasing Z of the heavy atom. In some cases the transmission asymmetry reaches its largest values at those energies where resonances in the total cross section occur. In a second experiment it has been shown that an unpolarized electron beam, when transmitted through the vapour of bromocamphor, becomes longitudinally polarized. The value of this polarization and the measured transmission asymmetry correspond to each other, as predicted by theory.