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Report No.

Dissociative ionization of ethanol in circularly-polarized intense laser fields

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

When a molecule is exposed to circularly-polarized laser fields, dissociation processes following ionization proceed differently from the case of linearly polarization. In the present work, ethanol molecules are irradiated with a circularly-polarized intense laser field (I = 1.4$$times$$10$$^{13}$$ W/cm$$^{2}$$, $$lambda$$ $$sim$$800 nm), and the produced electron and ion are measured in coincidence. The relative yields of C$$_{2}$$H$$_{4}$$OH$$^{+}$$, CH$$_{2}$$OH$$^{+}$$, and C$$_{2}$$H$$_{5}$$C$$^{+}$$ with respect to the parent ion are 0.36, 0.31, and 0.01, which correspond to only 0.5, 0.4, and 0.2 of those for the linear polarization with similar laser field intensity (1.7$$times$$10$$^{13}$$ W/cm$$^{2}$$), showing that the polarization change from linear to circular significantly suppresses the C-H, C-C, and C-O dissociation processes.



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