The study of the 39K 2 Rydberg 1Δ g states by CW optical-optical double-resonance spectroscopy

Abstract

Three intermediate-lying Rydberg 1Δ g states of 39K 2 were studied by CW optical-optical double-resonance (OODR) spectroscopy. The absolute vibrational numbering, the Dunham coefficients, the Rydberg-Klein-Rees (RKR) potential curves, and the Franck-Condon factors (FCF) of three ( nd) 1Δ g - B 1Π u systems are given. The variation with the principal quantum number n of the contribution of the ndδ g Rydberg electron to the binding energy is discussed. In addition, five observed successive ( nd) 1Δ g states included in this work ( n = 8, 9, and 10) and the work of Wang et al. ( J. Chem. Phys., in press) ( n = 6 and 7) are assigned absolute electronic state numbering based on the molecular building-up principle. Furthermore, the dissociation limits, the dissociation energies, and the quantum defects of those ( nd) 1Δ g states are compared with respect to the asymptotic assignments made by Broyer et al. ( Chem. Phys. Lett. 99, 206–212, 1983) and by Kowalczyk et al. ( Z. Phys. D. 13, 231–240, 1989); our work supports the assignment of Broyer et al.