Uenishi Ryuta, Horio Takuya, Suzuki Toshinori
Department of Chemistry, Graduate School of Science , Kyoto University , Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502 , Japan.
J Phys Chem A. 2019 Aug 15;123(32):6848-6853. doi: 10.1021/acs.jpca.9b05179. Epub 2019 Jul 31.
Ultrafast electronic relaxation following 9.3 eV photoexcitation of gaseous acetone was investigated with time-resolved photoelectron imaging spectroscopy. An intense photoionization signal due to a transition from the 4A(π,π*) state to the D(π) cationic state diminishes within 50 fs, owing to vibrational wave packet motion leaving our observation energy window. Additional photoionization signals were assigned to transitions from Rydberg states with principal quantum numbers of 3-8 to the D(n) cationic state, created by strong vibronic couplings with the bright 4A(π,π*) state. The deactivation processes of the 4A(π,π*) and Rydberg states are discussed based on their decay profiles obtained from a time-energy map of photoelectron kinetic energy distributions.
