Laser Mass Spectrometry with Circularly Polarized Light: Circular Dichroism of Molecular Ions
Laser Mass Spectrometry with Circularly Polarized Light: Circular Dichroism of Molecular Ions
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DOI：
10.1002/cphc.201200614
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发表时间：
2012-12-21
期刊：
影响因子：
2.9
通讯作者：
Boesl, Ulrich
中科院分区：
文献类型：
--
作者：
Loge, Christoph;Boesl, Ulrich
在最近的共振增强激光电离实验中，几个研究小组发现不同分子系统的分子和碎片离子的圆二色性之间存在很大差异。在3-甲基环戊酮（3-MCP）的情况下，我们归因于这种效果的大的圆二色性的分子离子。在这里介绍的工作中，这种效果在3-MCP研究离子光谱，通过改变中性中间激发态参与共振增强多光子电离（REMPI）和通过执行REMPI诱导的测量圆二色性在不同的激光脉冲能量。事实证明，在离子基态的结构变化的动力学强烈影响所观察到的离子圆二色性。
In recent experiments of resonance-enhanced laser ionization, large differences between circular dichroism measured for molecular and fragment ions were found by several research groups for different molecular systems. In the case of 3-methylcyclopentanone (3-MCP) we attributed this effect to a large circular dichroism of the molecular ion. In the work presented here, this effect in 3-MCP is studied by ion spectroscopy, by varying the neutral intermediate excited state involved in resonance enhanced multiphoton ionization (REMPI) and by performing REMPI-induced measurements of circular dichroism at different laser pulse energies. It turns out that the dynamics of structural changes in the ionic ground state strongly influences the observed ionic circular dichroism.