Abstract
The microwave absorption spectrum of the SiN radical has been detected in a dc glow discharge in a SiCl4 or SiH4/N2 mixture. The three rotational transitions N=2←1, 3←2, and 4←3, have been observed in the frequency region 87 to 175 GHz by using a source-frequency modulation microwave spectrometer. The rotational constant, the centrifugal distortion constant, the spin-rotation coupling constant, and the magnetic hyperfine coupling constants b and c and the electric quadrupole coupling constant of the nitrogen nucleus have been precisely determined. The electronic structure of the SiN molecule has been briefly discussed using the magnetic hyperfine coupling constants and also the quadrupole coupling constant [3.05(23) MHz] of 14N.
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