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Indexed by:期刊论文

Date of Publication:2017-12-01

Journal:LASER PHYSICS LETTERS

Included Journals:SCIE

Volume:14

Issue:12

ISSN No.:1612-2011

Key Words:photoassociation; above-threshold dissociation; wave-packet dynamics

Abstract:Using the quantum wave-packet method, we investigated the photoassociation (PA) processes of H+ + He -> HeH+ in the ground electronic state (X-1 Sigma(+)(g)). Two cases are considered where the target vibrational state selected is v = 4 and 8, respectively. It is found (for the first time) that above-threshold dissociation (ATD) occurs alongside the PA process (PA-ATD). ATD dissociation can be the major loss mechanism for the PA process. Compared with the direct dissociation from a given vibrational state and continuum-continuum transitions to the same final energy, the overall PA-ATD process is enhanced in comparison to individual contributions due to correlations. The one-photon dissociation from the target vibrational state, the ATD signals from two-photon dissociation and the higher-order (three-and four-photon) dissociations are the results of different mechanisms.