硝基甲烷阴离子的低能光电子成像光谱：电子亲和能、振动特征、各向异性及偶极束缚态

Low-energy photoelectron imaging spectroscopy of nitromethane anions: Electron affinity, vibrational features, anisotropies, and the dipole-bound state.

作者信息

Adams Christopher L, Schneider Holger, Ervin Kent M, Weber J Mathias

机构信息

JILA, NIST, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, USA.

出版信息

J Chem Phys. 2009 Feb 21;130(7):074307. doi: 10.1063/1.3076892.

DOI:10.1063/1.3076892

PMID:19239294

Abstract

We present low-energy velocity map photoelectron imaging results for nitromethane anions. The photoelectron spectrum is interpreted with the aid of ab initio theory and Franck-Condon factor calculations. We obtain a new value for the adiabatic electron affinity of nitromethane of (172+/-6) meV and observe the dipole-bound state of nitromethane. The photoelectron angular distributions of the observed features are discussed in the context of threshold laws for photodetachment.

摘要

我们展示了硝基甲烷阴离子的低能速度映射光电子成像结果。借助从头算理论和弗兰克 - 康登因子计算对光电子能谱进行了解释。我们得到了硝基甲烷绝热电子亲和势的新值为(172±6)毫电子伏特，并观测到了硝基甲烷的偶极束缚态。在光剥离阈值定律的背景下讨论了所观测特征的光电子角分布。