The H1Sigma+g (v = 0 and 1) and EF1Sigma+g (v = 28 and 32) States of D2: Term Values and Fluorescence Lifetimes

The extreme ultraviolet-visible double resonant excitation method was applied to the gerade Rydberg states of D2 molecules. Tunable coherent extreme ultraviolet radiation near 103 nm prepared D2 in the B1Sigma+u (v = 7, J) state. Visible laser light subsequently brought them to the H1Sigma+g (v = 0 and 1), EF1Sigma+g (v = 28 and 32), and GK1Sigma+g (v = 2 and 5) states. Our term values for the GK1Sigma+g state were in complete agreement with previous values, while deviations beyond the experimental error were found for the H1Sigma+g (v = 1) and EF1Sigma+g (v = 28 and 32) states. The fluorescence lifetimes, measured under a collision-free environment for the first time, were in reasonable agreement with ab initio calculations. Copyright 1998 Academic Press.