Velocity modulation diode laser spectroscopy of negative ions: The v 1, v1+v2-v2, v1+v 3-v3 bands of thiocyanate (NCS-)

Mark Polak, Martin Gruebele, Richard J. Saykally

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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.

Original languageEnglish (US)
Pages (from-to)3352-3356
Number of pages5
JournalThe Journal of Chemical Physics
Issue number6
StatePublished - Jan 1 1987
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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