The Infrared Spectrum of Nitrosyl Fluoride. Part II. Rotational Analysis of ν1 and ν3

Abstract

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, D_J′+D_J″=0.000027₅; for ν₃, 2B″=0.7521, 2B′=0.7503, D_J′+D_J″=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.