利用亚多普勒偏振光谱法测定6Li2 A1Σ+u-X1Σ+g体系的精确分子常数

Precise Molecular Constants for the 6Li2 A1Sigma+u-X1Sigma+g System by Sub-Doppler Polarization Spectroscopy.

作者信息

Wang X, Yang J, Qi J, Lyyra AM

机构信息

Physics Department, Temple University, Philadelphia, Pennsylvania, 19122

出版信息

J Mol Spectrosc. 1998 Oct;191(2):295-305. doi: 10.1006/jmsp.1998.7645.

DOI:10.1006/jmsp.1998.7645

PMID:9753564

Abstract

We report here new and more accurate molecular constants from sub-Doppler polarization spectroscopy of the A1Sigma+u-X1Sigma+g system of 6Li2 using single mode cw dye lasers. These new constants cover the range of vibrational levels from v" = 0-8 in the ground state and v' = 0-24 in the excited state. New molecular constants and RKR potential energy curves for the A1Sigma+u and X1Sigma+g states are given. The Te value for the A1Sigma+u state is 14068.043(34) cm-1. The analysis indicates that there is a noticeable breakdown of the Born-Oppenheimer approximation for the 6Li2 and 7Li2 isotopomers. Copyright 1998 Academic Press.

摘要

我们在此报告使用单模连续波染料激光器对(^{6}Li_{2})的(A^{1}\Sigma^{+}{u}-X^{1}\Sigma^{+}{g})系统进行亚多普勒偏振光谱分析得到的新的且更精确的分子常数。这些新常数涵盖了基态(v'' = 0 - 8)和激发态(v' = 0 - 24)的振动能级范围。给出了(A^{1}\Sigma^{+}{u})和(X^{1}\Sigma^{+}{g})态的新分子常数及RKR势能曲线。(A^{1}\Sigma^{+}{u})态的(T{e})值为(14068.043(34) cm^{-1})。分析表明，对于(^{6}Li_{2})和(^{7}Li_{2})同位素分子，玻恩 - 奥本海默近似存在明显的失效情况。版权所有1998年学术出版社。