Spectroscopic observation of vibrational Feshbach resonances in near-threshold photoexcitation of X-•CH3NO2 (X- = I- and Br-)

被引：41

作者：

Dessent, CEH

Kim, J

Johnson, MA ^{[1
]}

机构：

[1] Univ York, Dept Chem, York YO10 5DD, N Yorkshire, England

[2] Yale Univ, Sterling Chem Lab, New Haven, CT 06520 USA

来源：

FARADAY DISCUSSIONS | 2000年 / 115卷

关键词：

D O I：

10.1039/a909550k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report the observation of resonance structure in the absorption and X-/NO2- photofragment action spectra of the X- . CH3NO2 (X- = I- and Br-) complexes in the region above the electron detachment threshold. The resonance structure corresponds to peaks which appear at the onsets for vibrational excitation of the -NO2 wag, scissors, and stretch modes of neutral CH3NO2, the modes which most strongly distort upon electron capture into its pi* lowest unoccupied molecular orbital. We attribute the peaks to excitation of vibrational Feshbach resonances of the CH3NO2- transient negative ion, where near-threshold excitation of X- . CH3NO2 spectroscopically accesses states of the free electron-CH3NO2 system.

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收藏

页码：395 / 406

页数：12

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