Analysis of the rotational structure of ν1 and ν3 infrared bands of nitrosyl fluoride at 1844.03 and 765.85 cm−1 showed that this molecule is nearly a prolate symmetric top. The following rotational parameters based on symmetric-top theory were found and are expressed in cm−1: for ν1, 2B″=0.7515, 2B′=0.7483, DJ′+DJ″=0.0000275; for ν3, 2B″=0.7521, 2B′=0.7503, DJ′+DJ″=0.00000236. The anharmonic term x33 was found to be −1.06 cm−1 from ν3. The anharmonic term x12 was found to be +1.03 cm−1 from ν1.
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D. W. Magnuson (1952) studied this question.
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