Hyperfine interaction constants of (NO2)-N-14 in 14 500-16 800 cm(-1) energy region

摘要

We observed hyperfine-resolved high-resolution fluorescence excitation spectra of k = 0, N = 1 <- 0 transitions in 82 vibronic bands of the (A) over tilde B-2(2) <- (X) over tilde (2)A(1) system of (NO2)-N-14 in the 14 500-16 800 cm(-1) region by crossing a jet-cooled molecular beam and a single-mode dye laser beam at right angles. We determined hyperfine interaction constants of the lower and upper states for all the observed vibronic bands based on the analysis of the hyperfine structures of k = 0, N = 1 <- 0 transitions. Most of the determined Fermi contact interaction constants were found to be distributed in 0.0013-0.0038 cm(-1), which are intermediate in magnitude between those in lower and higher energy region reported by other groups. A sharp decreasing of the Fermi contact interaction constant was found in 16 20016 600cm(-1), and itmaybe caused by the interaction with the dark (C) over tilde (2)A(2) state. The hyperfine interaction constants are powerful clues to obtain reliable vibronic assignment. We tentatively assigned vibronic bands located at 14 836 cm(-1), 15 586 cm(-1), and 16 322 cm(-1) as the transitions to the intrinsic (0,7,0), (0,8,0), and (0,9,0) vibrational levels of the (C) over tilde B-2(2) state, respectively. Published by AIP Publishing.