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Dissociative ionization of ethanol in intense UV laser fields observed by photoelectron-photoion coincidence momentum imaging

Ikuta, Tomoya; Itakura, Ryuji; Hosaka, Koichi*; Akagi, Hiroshi; Yamanouchi, Kaoru*; Kannari, Fumihiko*; Yokoyama, Atsushi

When ethanol molecules are irradiated with an intense UV pulse (400 nm, 100 fs, 15$$sim$$33 TW/cm$$^{2}$$), channel-specific photoelectron momentum images correlated with C$$_{2}$$H$$_{5}$$OH$$^{+}$$, C$$_{2}$$H$$_{4}$$OH$$^{+}$$, CH$$_{2}$$OH$$^{+}$$, and C$$_{2}$$H$$_{5}$$$$^{+}$$ show different features, suggesting that different electronic and vibrational state distributions are prepared upon the ionization for the respective product ion channels. Basically, the electronic ground state and the first electronically excited state are prepared upon the ionization, and then the subsequent interaction between the ion and the laser field takes place, leading to the respective reaction channels.

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