Prabhudesai Vaibhav S, Nandi Dhananjay, Kelkar Aditya H, Krishnakumar E
Tata Institute of Fundamental Research, Colaba, Mumbai, India.
J Chem Phys. 2008 Apr 21;128(15):154309. doi: 10.1063/1.2899330.
Dissociative electron attachment (DEA) cross sections for simple organic molecules, namely, acetic acid, propanoic acid, methanol, ethanol, and n-propyl amine are measured in a crossed beam experiment. We find that the H(-) ion formation is the dominant channel of DEA for these molecules and takes place at relatively higher energies (>4 eV) through the core excited resonances. Comparison of the cross sections of the H(-) channel from these molecules with those from NH(3), H(2)O, and CH(4) shows the presence of functional group dependence in the DEA process. We analyze this new phenomenon in the context of the results reported on other organic molecules. This discovery of functional group dependence has important implications such as control in electron induced chemistry and understanding radiation induced damage in biological systems.
在交叉束实验中测量了简单有机分子（即乙酸、丙酸、甲醇、乙醇和正丙胺）的解离电子附着（DEA）截面。我们发现，H(-)离子的形成是这些分子DEA的主要通道，并且通过核心激发共振在相对较高的能量（>4 eV）下发生。将这些分子的H(-)通道截面与NH(3)、H(2)O和CH(4)的截面进行比较，结果表明DEA过程中存在官能团依赖性。我们根据其他有机分子的报道结果来分析这一新现象。官能团依赖性的这一发现具有重要意义，例如在电子诱导化学中的控制以及对生物系统中辐射诱导损伤的理解。
