The A(2Πi)–X(2Σ+) transition of the SiN radical by infrared diode laser spectroscopy

Abstract
The A(2Πi)–X(2Σ+) 1,0 band of SiN has been observed in the 5 μm region by diode laser spectroscopy in a silane/nitrogen electrical discharge plasma. A detailed analysis of about 170 observed lines has led to a v=1 term value for the A state of 1972.443 73(24) cm1 with 2.5 standard deviations in parentheses, which, when combined with optical data, was converted to the equilibrium term value of 993.9(2) cm1. The analysis has clearly confirmed that the spin‐orbit coupling constant in the A state is negative. The Λ‐type doubling constants p and q in the A state have been determined for the first time, and other parameters including the rotational and spin‐orbit coupling constants have been improved in accuracy by a factor of 100.

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