Accurate knowledge of transition dipole moment matrix elements is crucial since important parameters associated with the interaction of light with matter, such as emission and absorption line intensities, lifetimes, and Einstein coefficients, depend on these matrix elements. We report here an experimental study of the Na 5Σ↔AΣ and 6Σ↔AΣ electronic transition dipole moments and their dependence on internuclear distance. We have measured absolute transition dipole matrix elements for ro-vibrational transitions of the Na 5Σ↔AΣ and 6Σ↔AΣ electronic transitions using Autler-Townes and optical-optical double resonance spectroscopy, and we compare the results to ab initio theoretical values [A. Sanli et al., J. Chem. Phys. 143, 104304 (2015)].

In this work we demonstrate optical control of the singlet-triplet probability distribution in the outcome of a collisional process involving lithium dimers and argon atoms. The control is achieved using the Autler-Townes effect to manipulate the spin character of a spin-orbit coupled pair of levels serving as a "gateway" between the singlet and triplet electronic state manifolds.

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This paper reports a high-resolution experimental study and a numerical analysis of the Rb2 6 1 Σ + g ion-pair state. Large number of ro-vibrational term values spanning a wide range of the rotational and vibrational quantum numbers were measured using the optical-optical double resonance technique. The set of term values was simulated with a model of a piece-wise multi-parameter potential energy function based on the generalized splines. This function reproduces the experimental data with reasonable accuracy and in addition allows us to incorporate in the potential function the non-trivial features at longer internuclear range, such as multiple wells, predicted by the ab initio calculations.

This paper reports observations and analysis of the Rb2 31Πg state. A total of 323 rovibrational term values spanning the range of the rotational quantum number J = 7 through 77 and the vibrational quantum number v = 2 through 23 (about 1/3 of the potential well depth) were measured using the optical–optical double resonance technique. The term values are simulated within a model of a piece-wise multi-parameter potential energy function based on the generalized splines. This function not only enables a reproduction of the experimental data with a reasonable quality but also approximates the available ab initio function in its whole range with a uniform accuracy.