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Dissociation of H2+ prepared in different rovibronic states by keV collisions with rare gases

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>9/10/1987
<mark>Journal</mark>International Journal of Mass Spectrometry and Ion Processes
Issue number1
Number of pages20
Pages (from-to)81-100
Publication StatusPublished
<mark>Original language</mark>English


Translational energy spectra for H+ ions produced by the keV collision-induced dissociation of H2+ on rare gases were recorded on a reversed-geometry mass spectrometer. Results were obtained for various vibrational populations of the precursor H2+ (1sσg) state formed by electron impact. Experimental kinetic energy distributions are compared with a 1sσg → 2pσu Franck-Condon calculation. A new dissociative mechanism involving vibrational excitation of H2+ (1sσg) to quasi-bound states, and subsequent predissociation, is proposed to explain the formation of H+ fragments with centre of mass kinetic energy release less than 0.3 eV.