Oscillator strengths for the Rydberg states of NaHe

The oscillator strengths for Rydberg states of a NaHe molecule are calculated using a semianalytic procedure with the l -coupling effect taken into account (due to the dipole potential of a core). This effect gives rise to nonzero oscillator strengths for transitions forbidden in the atomic model of molecular Rydberg states. The difference between calculations in terms of the atomic model and calculations with consideration of the dipole moment of a core is shown for allowed transitions.