Laser spectroscopic investigation of the X 2Σ1/2 state of the van der Waals molecule NaAr
作者:G. Aepfelbach、A. Nunnemann、D. Zimmermann
DOI:10.1016/0009-2614(83)80679-4
日期:1983.4
The laser-excitation spectrum of the transition X 2Σ+ → A 2Π of NaAr has been investigated using a supersonic expansion of a mixture of sodium vapor and argon gas for production of the molecules. In comparison to preyous investigations the rotational constants of the vibrational levels ν″ = 2, 3 and 4 of the X 2Σ+ state could in addition be determined. From our results we deduce a value of Re = 5.008(5)
转变的激光激发光谱X 2 Σ + →A 2 NAAR的Π已经使用钠蒸气的混合物的超声膨胀和氩气生产的分子的影响。相比于preyous调查的振动能级ν“= 2,3和X 4的转动常数2 Σ +状态可以另外被确定。从我们的结果,我们推断的值[R ê = 5.008(5)×10 -10米为核间距和的平衡d È = 41.7(δ)厘米-1为X的井深2 Σ +状态。
Direct observation of nonadiabatic transitions in Na+rare-gas differential optical collisions
We study the dynamics in optical collisions of Na with Ne, Ar, Kr, and Xe in a differential scattering experiment. We report the observation of nonadiabatic transitions in the excited collisional quasimolecule based on measurements of the population ratio of the Na(3p)2P1/2 and 2P3/2 fine-structure levels. Comparison with theoretical results shows a generally very good agreement over the range of collision energies (0.01–0.3 eV) scanned in our experiment, using the best available potentials. For the heavier rare-gas systems a strong influence of the BΣ–AΠ crossing on the population ratios is observed. We further extract a universal function for the nonadiabatic transition probability for these systems. In the thermal energy range, our results are in good qualitative agreement with data from gas phase optical collision experiments.