Photodissociation as a probe of the H3+ avoided crossing seam. (5th August 2019)

• Record Type: Journal Article
• Authors: Urbain, X.; Dochain, A.; Marion, R.; Launoy, T.; Loreau, J.
• Is Part Of: Philosophical transactions. Volume 377:Number 2154(2019)
• Publication Date: 2019-08-05
• Subjects: photodissociation -- charge transfer -- non-adiabatic interactions; Physical sciences -- Periodicals; Engineering -- Periodicals; Mathematics -- Periodicals; 500
• DOI: 10.1098/rsta.2018.0399
• Languages: English
• ISSNs: 1364-503X

Abstract

Abstract : Experiments are conducted to investigate the role of the avoided crossing seam in the photodissociation of H3 + . Three-dimensional imaging of dissociation products is used to determine the kinetic energy release and branching ratio among the fragmentation channels. Vibrational distributions are measured by dissociative charge transfer of H + 2 products. It is found that the photodissociation of hot H3 + in the near-ultraviolet produces cold H + 2, but hot H2 . Modelling the wavepacket dynamics along the repulsive potential energy surface accounts for the repopulation of the ground potential energy surface. The role of the avoided crossing seam is emphasized and its importance for the astrophysically relevant charge transfer reactions underlined. This article is part of a discussion meeting issue 'Advances in hydrogen molecular ions: H3 +, H5 + and beyond'.