卤化氢共振增强多光子电离光谱  

REMPI Spectra of the Hydrogen Halides

作　　者：王华胜[1] KVARAN gúst 

机构地区：[1]冰岛大学理科研究所

出　　处：《物理化学学报》2007年第10期1543-1552,共10页Acta Physico-Chimica Sinica

基　　金：Icelasndic Science Foundation (97529);University of Iceland Research Fund

摘　　要：测定了卤化氢(HCl,HBr和HI)(2+1)共振增强多光子电离(REMPI)光谱,采用模拟计算法分析推导出转动常数、谱带源以及Ω态振动谱带的同位素位移值.得到的HCl数据同Green等人用常规分析法所推导的结果极为吻合.得出8条振动谱带,其中包括V(1Σ+)态,E(1Σ+)的v′=4态以及HBr的5个新谱带,此外还推导出HI的E态v′=1的4个振动谱带光谱参数.观测了V和E态之间因同类相互作用而产生的不规则能级间距、转动参数和同位素位移.讨论了HCl和HBr的E态和V态振动谱带中的转动谱线序列O和S对Q的强度比的变化,提出了双光子激发机理.（2＋1） resonance muhiphoton ionization （REMPI） spectra of HX（X=C1, Br and I） were recorded and analyzed by simulation calculation to derive rotational constants, band origins and isotope shift values for a number of vibrational bands of Ω states. Our data for HCl compared nicely with those derived by Green et al. using conventional analysis methods. New spectroscopic parameters were derived for 8 vibrational bands which were assigned to the V（^1 Σ^＋） state, for v＇=4 of the E（^1 Σ^＋） state as well as for 5 new bands in HBr. New spectroscopic parameters were derived for 4 vibrational bands which are assigned to the V state and for v＇=l of the E state in HI. Anomalies in energy level spacings, rotational parameters and isotope shift values were observed as being largely due to homogeneous interactions between the V and the E states. Variations observed in the intensity ratio of O and S line series to Q line series in vibrational bands of the E and V states for HC1 and HBr were discussed and mechanisms of two photon excitation processes were proposed.

关 键 词：共振加强多光子电离 卤化氢 激光光谱学 微扰 光谱模拟 激发机理 

分 类 号：O641.1[理学—物理化学]