Electronic Spectroscopy and Photoionization of LiMg
Electronic Spectroscopy and Photoionization of LiMg
复制标题
LiMg 的电子能谱和光电离
DOI：
10.1021/acs.jpca.1c01656
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Heaven, Michael C.
中科院分区：
文献类型：
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作者：
Persinger, Thomas D.;Han, Jiande;Heaven, Michael C.
从其键合特性和激光冷却至超冷温度的潜力的角度来看，由与碱土金属键合的碱金属组成的二聚体引起了人们的兴趣。对其中许多物质进行了实验和理论研究，但 LiMg 和 LiMg+ 阳离子的光谱数据很少。在这项研究中，提出了 LiMg 的旋转分辨电子光谱。基态被确认为X12Σ+，并且首次报道了低位电子激发态的观测结果。对近紫外光谱范围内的转变的重新检查表明，之前的波段分配应该进行修改。使用双色激光激发技术确定电离能为 4.7695(4) eV。该值比之前报告的实验估计值低 1.2 eV。获得了 LiMg+ 的振动分辨光谱，产生的分子常数与电离时键的显着强化一致。
Dimers consisting of an alkali metal bound to an alkaline earth metal are of interest from the perspectives of their bonding characteristics and their potential for being laser cooled to ultracold temperatures. There have been experimental and theoretical studies of many of these species, but spectroscopic data for LiMg and the LiMg+cation are sparse. In this study, rotationally resolved electronic spectra for LiMg are presented. The ground state is confirmed to be X12Σ+and observations of low-lying electronically excited states are reported for the first time. Reexamination of transitions in the near-UV spectral range indicates that previous band assignments should be revised. Two-color laser excitation techniques were used to determine an ionization energy of 4.7695(4) eV. This value is 1.2 eV below the previously reported experimental estimate. Vibrationally resolved spectra were obtained for LiMg+, yielding molecular constants that were consistent with a substantial strengthening of the bond on ionization.