Momentum correlation between photoelectrons and fragment ions in dissociative ionization of methanol in intense laser fields

Fukahori, Shinichi*; Nakano, Motoyoshi; Yamanouchi, Kaoru*; Itakura, Ryuji

We investigate the mechanism of the electronic excitation of singly charged methanol cation in dissociative ionization of methanol cation in intense laser fields based on photoelectron-photoion coincidence momentum imaging. From three independent experimental results such as (1) channel specific photoelectron spectra, (2) energy correlation of photoelectrons and fragment ions and (3) angular correlation of electron emission and fragment recoil, two types of ionization and electronic excitation pathways are revealed.