Observation and Exploitation of Spin–Orbit Excited Dipole-Bound States in Ion–Molecule Clusters
Observation and Exploitation of Spin–Orbit Excited Dipole-Bound States in Ion–Molecule Clusters
复制标题
离子分子簇中自旋轨道激发偶极束缚态的观察和利用
DOI：
10.1021/acs.jpclett.1c03309
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Xue-Bin Wang
中科院分区：
文献类型：
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作者：
Wenjin Cao;Hanhui Zhang;Qinqin Yuan;Xiaoguo Zhou;Steven R. Kass;Xue-Bin Wang
本文报道了用波长分辨的“碘标记”负离子光电子能谱技术对精氨酸-碘络合物（Arg·I-）的自旋轨道激发偶极束缚态（DBS）的观测结果。所观察到的DBS与两性离子构象中中性Arg·I络合物的自旋轨道激发的I（2 P1/2）能级结合，并基于I（2 P1/2）DBS到I（2 P3/2）中性基态的自旋轨道电子自脱离引起的共振增强来鉴定。DBS结合能与中性Arg·I异构体和互变异构体的偶极矩相关。因此，这项工作展示了一种新的和通用的光谱方法来识别离子分子簇构象的基础上，他们可区分的偶极矩。
We report an observation of spin–orbit excited dipole-bound states (DBSs) in arginine–iodide complexes (Arg·I–) by using temperature-dependent, wavelength-resolved “iodide-tagging” negative ion photoelectron spectroscopy. The observed DBSs are bound to the spin–orbit excited I(2P1/2) level of the neutral Arg·I complex in zwitterionic conformations and identified based on the resonant enhancement due to spin–orbit electronic autodetachment from the I(2P1/2) DBS to the I(2P3/2) neutral ground state. The observed DBS binding energies are correlated to the dipole moments of neutral Arg·I isomers and tautomers. This work thus demonstrates a new and generic spectroscopic approach to identify ion–molecule cluster conformations based on their distinguishable dipole moments.