Transition Dipole Moment ofNa2and Its Variation with Internuclear Distance

Abstract
The electronic transition dipole moment was determined for the transition XΣg+1BΠu1 of Na2 and was found to be 6.8+0.5r D over a range of internuclear distance r of 2.6-5.0 Å. Our results agree with earlier lifetime measurements and are in qualitative agreement with semiquantitative theoretical calculations, but they strongly disagree with the recent work of Callender, Gersten, Leigh, and Yang.