Precise Molecular Constants for the 6Li2 A1 Σ+u-X1 Σ+g System by Sub-Doppler Polarization Spectroscopy

Xuejun Wang, Jie Yang, Jianbing Qi, A. Marjatta Lyyra

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15 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)295-305
Number of pages11
JournalJournal of molecular spectroscopy
Issue number2
StatePublished - Oct 1998

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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