Polarization dependence of ionization dynamics of ethanol in intense laser fields

Akagi, Hiroshi; Otobe, Tomohito; Itakura, Ryuji; Hosaka, Koichi*; Yamanouchi, Kaoru; Yokoyama, Atsushi

In the present work, ethanol molecules are irradiated with a circularly polarized intense laser field [I=(1.10.2) 10 W/cm, 800 nm], and the produced electron and ion are measured in coincidence. The channel-specific photoelectron spectra correlated with the C-C and C-O dissociation channels show the series of distinctive above-threshold ionization (ATI) peaks, which are similar to those correlated with the parent ion production and C-H dissociation channels. These features imply that the electronic ground state of the parent ion is initially prepared at the moment of the ionization. On the other hand, for the linear polarization, the ATI series is less pronounced, and a diffuse structure become a dominant, which means that the electronically excited states of the parent ion are produced directly on the ionization. Based on the theoretical prediction, we will discuss the polarization dependence of the ionization dynamics.