Optical cycling in charged complexes with Ra–N bonds

Chemical Physics Letters(2024)

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摘要
The extension of laser cooling and trapping techniques to polyatomic molecular ions would have advanced scientific applications such as search of physics outside of the Standard Model, ultracold chemistry etc. We apply the Fock space relativistic coupled cluster method to study low-lying electronic states of molecular ions with Ra–N bonds, namely RaNCH+, RaNH3+ and RaNCCH3+. Prospects of laser cooling of these species are estimated, and the peculiarities of unpaired-electron distributions are analyzed from the point of view of the molecular electronic structure. RaNH3+ and RaNCCH3+ are the first symmetric top molecular ions expected to be suitable for direct laser cooling.
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关键词
Molecular cations,Optical cycling center,Laser cooling,Radioactive molecules
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