The CX transition in CaKr + and CaAr +

Abstract

An electronic transition in the isolated CaKr + ion with an origin at 14217 cm −1 has been observed in the resonant photodissociation spectrum. A short vibrational progression yields excited state vibrational constants of ω′ e = 60 cm −1 and ω e x′ e = 2.78 cm −1 and a diabatic binding energy of 330 ± 100 cm −1. The excited state in this transition arises from the Ca +3 p 63 d[ 2 D] + Kr[ 1 S] atomic limit and is tentatively assigned as a 2 Σ + state. A single weak hot band feature places the ground state vibrational frequency, ΔG″ 1 2 , at 74 cm −1. The analogous transition in CaAr + has also suffered analysis. The X 2 Σ + ground state of the CaKr + ion is bound by 840 ± 100 cm −1 almost the same as that found for CaAr +, 890 ± 100 cm −1.