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Photoelectron-photoion coincidence momentum imaging for dissociative ionization in intense laser fields

Hosaka, Koichi; Itakura, Ryuji; Yokoyama, Keiichi ; Yamanouchi, Kaoru*; Yokoyama, Atsushi

When molecules are exposed to intense laser fields, dissociative ionization is efficiently induced and several decomposition pathways competes. The present study aims at revealing the correlation between the electronic states just after ionization and the following dissociation process. The photoelectron-photoion coincidence momentum imaging (PEPICO-MI) technique enables us to detect photoelectrons and photoions produced in a single event simultaneously. We applied PEPICO-MI to dissociative ionization of ethanol (C$$_{2}$$H$$_{5}$$OH), whose branching ratio varies as a function of the laser pulse duration. When ethanol molecules are irradiated with a short laser pulse, photoelectron images strongly depend on the correlated product ions.

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