149 transitions in the v1 band (CN stretch) and the corresponding bending and stretching hot bands of thiocyanate (NCS-) have been measured using velocity modulation spectroscopy with a tunable diode laser. The data were fit to an effective rotation-vibration Hamiltonian, yielding spectroscopic parameters for the (000), (100), (010), (110), (001), and (101) vibrational states. The band origin is v1=2065.9312(13) cm-1 and the equilibrium rotational constant is calculated to be 0.197 438(61 ) cm-1. NCS- was prepared in a NH 3/CS2 discharge, and unlike the recently studied case of NCO-, vibrational excitation in excess of the rotational temperature (650±200 K) was not observed.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry