Laser spectroscopic investigation of the van der Waals molecule NaKr84

Publisher Website
Google Scholar
Abstract
The absorption spectrum of the van der Waals molecule NaKr due to the transition X 2Σ→A2Π has been observed with high resolution using a tunable single‐mode cw dye laser and producing the molecules by means of supersonic expansion. About 600 lines due to the most abundant Kr‐isotope Kr84 have been analyzed. The spectroscopic parameters of molecular rotation, of fine structure splitting and of λ‐type doubling have been obtained for the vibrational levels v’=10⋅⋅⋅14 of the A 2Π state and for the level v‘=0 of the X 2Σ state. The experimental positions of the band origins of the vibrational transitions are in satisfactory agreement with the results of model potential calculations. The equilibrium distances of the X 2Σ and of the A 2Π state of NaKr84 have been determined to be 4.919(7) and 3.02(9) Å, respectively. For the well depth we obtain values of (69±4), (790±60), and (750±60) cm−1 for X 2Σ, A 2Π1/2, and A 2Π3/2, respectively.