二溴甲烷的同步辐射光电离研究

Photoinization Studies of Dibromomethane Using Synchrotron Radiation

采用５０～２００ｎｍ同步辐射光，对ＣＨ_２Ｂｒ_２的光电离过程进行了研究。根据测定的母体离子及其碎片离子出现势，得到二溴甲烷的绝热电离势为１０．２３±０．０１ｅＶ，并获得了离子的生成焓、解离能及键能等热力学数据，分析了碎片离子的光解离电离通道。

The photoionization processes of dibromomethane have been investigated in the wavelength range 50～200 nm of synchrotron radiation.Based on the measured appearance potential(PA) of the parent ion.the adiabatic ionization potential(P_1=10.23±0.01 eV) of the dibromomethane was obtained.Furtheremore,the dissociation energies(E_D),the formation enthalpies(E_F),the bond dissociation energies(E_(BD))and the related thermochemical data of the species have been derived from the observed appearance potentials of the ionic fragments,Associating the obtained hats of formation with the previous thermochemical data,the most possible chnnels of dissociative photoionization have been analysed.