Quasibound states in long-range alkali dimers: Grid method calculations

Olivier Dulieu*, Ronnie Kosloff, Françoise Masnou-Seeuws, Goran Pichler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

A local minimum is found in the 0g+ long range potential curves of the K2 and Rb2 alkali dimers. This well-of magnitude 42 cm-1 for K2 and 93cm-1 for Rb2 - is located above the first ns +n2P3/2 dissociation limit and metastable states could be populated using laser light blue detuned compared to the resonance line. To compute the previously unknown energies and lifetimes of these quasibound states, two grid methods are employed. One method is based on diagonalizing a Fourier grid Hamiltonian, the other uses a propagation technique in imaginary time to filter out vibrational eigenfunctions. Equivalent results are given by both methods. Then the lifetimes are extracted from the correlation function obtained by propagation in real time of these numerical vibrational wave functions. The methods are employed both in adiabatic representation with one electronic potential curve and in diabatic representation with two potential curves. Two quasibound states are found for K2, and three for Rb2 above seven stable bound states. Their lifetimes vary from 20 ps to 3 ns.

Original languageEnglish
Pages (from-to)10633-10642
Number of pages10
JournalJournal of Chemical Physics
Volume107
Issue number24
DOIs
StatePublished - 22 Dec 1997

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