New observation of the 6Li7Li33Σg+, 13Δg, and 23Πg states and molecular constants with all 6Li2, 7Li2, and 6Li7Li data

This paper reports our new observation of the 33Σg+(v=3-7), 13Δg (v = 2-4), and 23Πg (v = 2-8) states of 6Li7Li by continuous wave perturbation facilitated optical-optical double resonance spectroscopy. Combining our new experimental term values of 6Li7Li with the available experimental data of 6Li2 and 7Li2, molecular constants and potential energy curves by Rydberg-Klein-Rees and direct-potential-fit techniques have been determined. Born-Oppenheimer breakdown parameters of the Li2 13Δg and 23Πg states are calculated.