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• W3100291369 endingPage "184315" @default.
• W3100291369 startingPage "184315" @default.
• W3100291369 abstract "We calculate the potential energy curves, the permanent dipole moment curves, and the lifetimes of the ground and excited vibrational states of the heteronuclear alkali dimers XY (X, Y = Li, Na, K, Rb, Cs) in the X1Σ+ electronic state using the coupled cluster with singles doubles and triples method. All-electron quadruple-ζ basis sets with additional core functions are used for Li and Na, and small-core relativistic effective core potentials with quadruple-ζ quality basis sets are used for K, Rb, and Cs. The inclusion of the coupled cluster non-perturbative triple excitations is shown to be crucial for obtaining the accurate potential energy curves. A large one-electron basis set with additional core functions is needed for the accurate prediction of permanent dipole moments. The dissociation energies are overestimated by only 14 cm−1 for LiNa and by no more than 114 cm−1 for the other molecules. The discrepancies between the experimental and calculated harmonic vibrational frequencies are less than 1.7 cm−1, and the discrepancies for the anharmonic correction are less than 0.1 cm−1. We show that correlation between atomic electronegativity differences and permanent dipole moment of heteronuclear alkali dimers is not perfect. To obtain the vibrational energies and wave functions the vibrational Schrödinger equation is solved with the B-spline basis set method. The transition dipole moments between all vibrational states, the Einstein coefficients, and the lifetimes of the vibrational states are calculated. We analyze the decay rates of the vibrational states in terms of spontaneous emission, and stimulated emission and absorption induced by black body radiation. In all studied heteronuclear alkali dimers the ground vibrational states have much longer lifetimes than any excited states." @default.
• W3100291369 created "2020-11-23" @default.
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• W3100291369 date "2014-05-14" @default.
• W3100291369 modified "2023-09-24" @default.
• W3100291369 title "Accurate potential energy, dipole moment curves, and lifetimes of vibrational states of heteronuclear alkali dimers" @default.
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• W3100291369 doi "https://doi.org/10.1063/1.4875038" @default.
• W3100291369 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24832278" @default.
• W3100291369 hasPublicationYear "2014" @default.
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