Vibrational spectroscopy of H2He+ and D2He+
نویسندگان
چکیده
Vibrational modes of the relatively strongly bound H2He+ molecular ion and its deuterated congener D2He+ are investigated by low-resolution multi-photon photodissociation spectroscopy, using a combination 4 K cryogenic ion-trap machine free-electron-laser FELIX. The band origins obtained fully explained accurate variational calculations rovibrational states based on three-dimensional potential energy surface Koner et al. (2019). Results from second-order vibrational perturbation theory, linear H–H–He equilibrium structure, agree well with those for energies up to about 1300 cm−1. This suggests that may either be considered as triatomic molecules degenerate bending mode, or Van der Waals complexes hindered rotation He around H2+ D2+ subunits. show in close dissociation limits, 1794 1852 cm−1 para- ortho-H2He+, respectively, angular internal motion becomes delocalized. experiments corroborate structure ions identify bright IR-active HH-stretch fundamental at 1840 DD-stretch 1309 cm−1, both an uncertainty 0.5%, good agreement calculations. also confirm H2+–He bend stretch fundamentals calculated 632 732 D2+–He 473 641 respectively.
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ژورنال
عنوان ژورنال: Journal of Molecular Spectroscopy
سال: 2021
ISSN: ['0022-2852', '1096-083X']
DOI: https://doi.org/10.1016/j.jms.2021.111423