Ultrafast excited-state dynamics of 2,4-dimethylpyrrole

文献情報

出版日 2017-10-23

DOI 10.1039/C7CP06292C

インパクトファクター 3.676

著者

Zhichao Chen, Zhigang He, Kaijun Yuan

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要旨

The ultrafast excited-state dynamics of 2,4-dimethylpyrrole following excitation at wavelengths in the range of 255.8–199.7 nm are studied using the time-resolved photoelectron imaging method. It is found that excitation at longer wavelengths (255.8, 250.0, 246.0 and 242.0 nm) results in population of the S1(1πσ*) state, which decays out of the photoionization window in less than 30 fs. At 237.7 nm, the second 1πσ* state is excited, which decays in about 130 fs. At shorter pump wavelengths (231.8, 224.8, 217.5 and 199.7 nm), the assignments are less clear-cut. We tentatively assign the initially photoexcited states to the 1π3p Rydberg states, which decay in about 60 fs, with internal conversion to the S1(1πσ*) state as one of the decay channels. The lifetimes of these 1π3p Rydberg states vary little with the pump wavelengths in this wavelength range.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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