激光偏振特性对丙酮和氧气多光子电离质谱信号的影响  

Different influences of laser polarization on REMPI mass spectroscopy of oxygen and acetone molecules

作　　者：张霞[1] 孔祥和[1] 樊新岩[1] 张树东[1] 王仍[1] 蔡廷栋[1] 

机构地区：[1]曲阜师范大学物理工程学院,曲阜273165

出　　处：《原子与分子物理学报》2005年第3期568-572,共5页Journal of Atomic and Molecular Physics

基　　金：曲阜师范大学博士科研启动基金资助

摘　　要：在极性分子丙酮复合物CH3COCH3·H2O和非极性分子氧气的REMPI谱中,母体离子信号强度与激光偏振方向的关系是不同的。改变532nm激光偏振方向,记录了两种分子母体离子信号强度,实验结果表明,对于氧气分子的母体离子信号强度,激光偏振方向的改变对其没有影响,而对于CH3COCH3·H2O的母体离子信号强度,随偶极矩与激光偏振方向夹角的增加,其母体离子信号强度呈余弦曲线变化,且与夹角余弦的2·1次幂成正比。理论分析显示,CH3COCH3·H2O的REMPI母体离子信号强度应与此夹角的余弦的2次幂成正比。这就说明实验结果和理论分析是相符的。The REMPI mass spectroscopy of O2 and CH3COCH3·H2O displayed that the dependence of their mother ion signal intensity to laser polarization direction is different. In the course of our experiment, change the polarization direction of 532 nm laser and recorder their mother ion signal intensity. The results show that the changes of laser polarization have no influence to mother ion signal intensity of non-polar molecule O2.And for polar molecule CH3COCH3·H2O, its mother ion signal intensity changes with the changes of laser polarization. With the angle a of molecular dipole moment to laser polarization increasing from 0°to 90°, the mother ion signal intensity decreases in according to cosine curve of angle a, and is in direct proportion to coa^2.1α. Theory analysis show that mother ion intensity of CH3COCH3·H2O is direct proportion to co^2.1 α.This indicates that experimental results is well consistent with theory analysis.

关 键 词：REMPI 母体离子 极性分子 偶极矩 

分 类 号：O562[理学—原子与分子物理]