Photoelectron circular dichroism of the randomly oriented chiral molecules glyceraldehyde and lactic acid
Photoelectron circular dichroism of the randomly oriented chiral molecules glyceraldehyde and lactic acid
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DOI：
10.1063/1.480581
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发表时间：
2000-01-01
影响因子：
4.4
通讯作者：
Powis, I
中科院分区：
文献类型：
--
作者：
Powis, I
研究表明，左旋和右旋圆偏振光与手性分子的不同相互作用会导致给定对映体光电离产生的光电子的不同角分布，即使目标分子是随机取向的。数值计算证明了 C3H6O3 结构异构体乳酸和甘油醛（包括后者的两种不同构象）的这种效应的大小。这些生物分子的价电子角分布 (CDAD) 的圆二色性在接近阈值时最为明显，但当电子动能接近 20 eV 及以上时往往会消失。 CDAD 信号的预计范围通常为微分截面的 10% 至 40%，有时甚至超过 60%。 (C) 2000 年美国物理研究所。 [S0021-9606(00)51201-X]。
The differing interaction of left and right circularly polarized light with chiral molecules is shown to lead to different angular distributions of the photoelectrons created by photoionization of a given enantiomer, even when the target molecules are randomly oriented. Numerical calculations are presented to demonstrate the magnitude of this effect for the C3H6O3 structural isomers lactic acid and glyceraldehyde, including two different conformations of the latter. Circular dichroism in the angular distributions (CDAD) of the valence electrons of these biomolecules is most pronounced close to threshold, but tends to vanish as the electron kinetic energy approaches 20 eV and above. CDAD signals are predicted to range, typically, from 10% to 40% and sometimes to more than 60% of the differential cross section. (C) 2000 American Institute of Physics. [S0021- 9606(00)51201-X].