Spectroscopic characterization of the X 2Π1/2, B 2Σ1/2, and H 2Σ1/2 states of AlKr

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Abstract
The AlKr van der Waals complex was characterized by laser-induced fluorescence spectroscopy in a supersonic free jet. Rotationally resolved spectra were recorded for eight bands of the AlKr(B 2Σ+←X 2Π1/2) transition and for seven bands of the AlKr(H 2Σ+←X 2Π1/2) transition. Rydberg–Klein–Rees potential-energy curves were determined for the B 2Σ+ and H 2Σ+ states, using vibrational and rotational spectroscopic constants derived from the spectra. The interaction between the X 2Π1/2 ground state and the low-lying repulsive A 2Σ+ state was characterized by analysis of the Λ doubling in the ground state. Equilibrium bond lengths were obtained for the X, B, and H states, and dissociation energies for the B and H states. The fact that the more strongly bound H 2Σ+ state has a larger re value than the B 2Σ+ state was rationalized by postulating an avoided potential curve crossing between the H 2Σ+ state and a repulsive valence 2Σ+ state correlating with Al(3s23d)+Kr.