Above-threshold dissociation occurring during photoassociation. (23rd November 2017)

• Record Type: Journal Article
• Authors: Han, Yong-Chang
• Is Part Of: Laser physics letters. Volume 14:Number 12(2017:Dec.)
• Publication Date: 2017-11-23
• Subjects: photoassociation -- above-threshold dissociation -- wave-packet dynamics; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/aa9317
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: Using the quantum wave-packet method, we investigated the photoassociation (PA) processes of H + + He → HeH + in the ground electronic state (X 1 Σ 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.