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TAKAYOSHI AMANO, Institute for Astrophysics and Planetary Sciences, Ibaraki University, Mito 310, Japan..
The ground electronic state of NCS radical is a 2i state and is isovalent with NCO. While NCO is one of the free radicals that have been studied very extensively in the microwave, millimeter-wave and visible-UV regions, high-resolution investigation of NCS has been relatively sparse. We studied the millimeter-wave spectrum of this radical in the ground vibrational state several years ago, and determined precise set of the molecular constantsa. Since then we extended our measurements to the excited vibrational states, v2=1 state in particular. The spectrum was found to be complicated due to large Renner-Teller interaction. The and vibronic states are fitted separately using effective Hamiltonians. A more complete global fit including the v2=2 vibronic states is in progress and will be discussed.