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 0.0006cm−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 (0.01cm−1) than for the ground state.
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