We report here new and more accurate molecular constants from sub-Doppler polarization spectroscopy of the A1 Σ+u-X1 Σ+g system of 6Li2 using single mode cw dye lasers. These new constants cover the range of vibrational levels from ν″ = 0-8 in the ground state and ν′ = 0-24 in the excited state. New molecular constants and RKR potential energy curves for the A1 Σ+u and X1 Σ+g states are given. The Te value for the A1 Σ+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.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry