Abstract
The rotational spectrum of the linear triatomic radical NCO has been observed by means of a Stark modulated microwave spectrometer. The NCO radical was produced by mixing HNCO with the products of a microwave discharge in CF 4. The observed rotational transitions J = 5 2 ← 3 2 , and 7 2 ← 5 2 in the 2 Π 3 2 state and J = 5 2 ← 3 2 in the 2 Π 1 2 state have been analyzed by using Hougen's formulation for a linear triatomic molecule in a 2Π state. The rotational constant, the centrifugal distortion constant, the Λ-type doubling constant, the hyperfine constants and the dipole moment have been determined. Consideration of the Λ-type doubling constant leads to the conclusion that the upper electronic state perturbing the 2Π state is A ( 2 Σ +) .
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