January 31, 2018
Journal Article

High-resolution infrared spectroscopy of the asymmetric NO stretch band of jet-cooled nitromethane and assignment of the lowest four torsional states

Abstract

A high-throughput CW slit-jet apparatus coupled to a high-resolution FTIR was used to record the asymmetric NO stretch band of nitromethane. The b-type band, including torsionally excited states with m = 3, has been assigned for Ka" = 10, J" = 20. The ground state combination differences derived from these assigned levels were fit with the RAM36 program to give an RMS deviation of 0.0006 cm-1. The band origin is 1583.0 (+/- 0.1) cm-1 and the torsional level spacing is nearly identical to that in the ground state. The upper state levels are split into multiplets by perturbations. A subset of the available upper state combination differences for m = 0, Ka' = 7, J' = 10 were fit with the same program, but with rather poorer precision (0.01 cm-1) than for the ground state.

Revised: May 23, 2018 | Published: January 31, 2018

Citation

Dawadi M.B., L. Degliumberto, D.S. Perry, H.D. Mettee, and R.L. Sams. 2018. High-resolution infrared spectroscopy of the asymmetric NO stretch band of jet-cooled nitromethane and assignment of the lowest four torsional states. Journal of Molecular Spectroscopy 343. PNNL-SA-127486. doi:10.1016/j.jms.2017.08.001