Identification of four rotamers of 3-methoxystyrene

by REMPI and MATI spectroscopy

Prof. TZENG, Wen-Bih (曾文碧)

Institute of Atomic and Molecular Sciences, Academia Sinica,

Taipei, 10617, Taiwan

台湾中央研究院 原子與分子科學研究所

地点: 物理学院西楼412会议室

时间： 2015年6月24日 (星期三)下午15:00-16:30

We report the vibronic and cation spectra of four rotamers of m-methoxystyrene, recorded by using the two-color resonant two-photon ionization and mass-analyzed threshold ionization techniques. The excitation energies of the S1 ← S0 electronic transition are found to be 32 767, 32 907, 33 222, and 33 281 cm?1; and the corresponding adiabatic ionization energies are 65 391, 64 977, 65 114, and 64 525 cm?1 for these isomeric species. Most of the observed active vibrations in the electronically excited S1 and cationic ground D0 states involve in-plane ring deformation and substituent-sensitive bending motions. It is found that the relative orientation of the methoxyl with respect to the vinyl group does not influence the vibrational frequencies of the ring-substituent bending modes.

联 系 人 吴成印 (62754986)