Research Abstract


Coherent vibrations in methanol cation probed by periodic H3+ ejection after double ionization

2018年3月4日 Communications Chemistry 1 : 7 doi: 10.1038/s42004-017-0006-7 (2018)
メタノールジカチオンから放出されたH3+の収量の38 fs 毎の周期的な増加 | 拡大する


Toshiaki Ando, Akihiro Shimamoto, Shun Miura, Atsushi Iwasaki, Katsunori Nakai and Kaoru Yamanouchi

Corresponding Author

山内 薫

When hydrocarbon molecules are exposed to an intense laser field, triatomic hydrogen molecular ion, H3+, is ejected. Here we describe pump–probe measurements of the ejection of H3+ from methanol dication with high temporal resolution using intense few-cycle laser pulses and find a long-lasting periodic increase in the yield of H3+.We show that H3+ ejection is the lowest energy decomposition channel and that its yield is enhanced each time when the vibrational wave packet coming back to the inner turning point of methanol cation is projected onto the dication potential energy surface. We also show that the time-resolved measurement of the yield of H3+ is an efficient tool not only for probing ultrafast nuclear dynamics of hydrocarbon cations but also for deriving vibrational frequencies of hydrocarbon cations with high precision.