First high-resolution study of the ¹³CHD₃ infrared spectrum: Rotational analysis of the ground state and the fundamentals ν₅ and ν₃/v₆

The rotational structure in three fundamental bands ν₃, ν_s, and ν₆ of ¹³CHD₃ has been analyzed. As this study evidently is the first high-resolution investigation on the spectrum of this molecule, the determination of the ground state rotational constants was the necessary first step. The ν₅ band (1290.536 cm^-1) could be treated as an isolated band whereas it was necessary to analyze the bands ν₃ (994.713 cm^-1) and ν₆ (1030.243 cm^-1) simultaneously because of very strong interactions. The total number of assigned lines was 1116. The spectral region 850-1530 cm^-1 was measured on a Fourier transform spectrometer and the ¹³C species was in natural abundance in CHD₃.