Potential energy curves and spin-orbit coupling of light alkali-heavy rare gas molecules

摘要

The potential energy curves of the X, A, and B states of alkali-rare gas diatomic molecules, MKr and MXe, are investigated for M = Li, Na, K. The molecular spin-orbit coefficients a(R) = 〈~2Π _(1/2)|?_(SO)|~2Π_(1/2)〉 and b(R) = 〈~2Π_(-1/2)|?_(SO)| ~2Σ_(1/2)〉 are calculated as a function the interatomic distance R. We show that a(R) increases and b(R) decreases as R decreases. This effect becomes less and less important as the mass of the alkali increases. A comparison of the rovibrational properties deduced from our calculations with experimental measurements recorded for NaKr and NaXe shows the quality of the calculations.