Journal
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
Volume 195, Issue -, Pages 332-336Publisher
ELSEVIER
DOI: 10.1016/j.elspec.2014.05.003
Keywords
Coulomb imaging; Molecular geometry; Concerted break up; Stepwise break up; Femtosecond laser; Molecular deformation
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We study the break up of OCS in intense femtosecond laser radiation using the FEMPULS technique to vary the laser pulse duration from 7 fs to 200 fs. Newton and Dalitz plots show the progression of molecular deformation and break up for OCS3+ and OCS4+. For increasing pulse length, the concerted three body dissociation exhibits increasing bending, and the amount of stepwise dissociation decreases. For the longest pulses however the stepwise process increases again. Both phenomena can be interpreted in terms of the effect of the laser field on lower charge states and the behaviour of a wave packet on a saddle point potential. The experiment illustrates the ability of the Coulomb imaging method to track molecular geometry and dynamics and indicates a new path to laser control of molecular parameters. (C) 2014 Elsevier B.V. All rights reserved.
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