High-resolution Fourier-transform infrared spectrum of the¹³CH₃F fundamental band of¹³CH₃F

The v₆ vibration-rotational band of¹³CH₃F has been measured in the range 1070-1260 cm^-1 using a Fourier-transform spectrometer with unapodized resolution 0.0027 cm^-1. The wavenumbers of 1262 vibration-rotational transitions to the v₆=1 (E) vibrational state have been assigned and fitted by least squares with the standard deviation of the fit 1.31×10^-4 cm^-1. This made it possible to determine 19 spectroscopical parameters of the v₆=1 state including parameters of the Δk=±2, Δl=∓2 and Δk=±4, Δl=∓2 interactions leading to the A₁-A₂ splittings of many rotational levels with kl=+1 and kl=-2.