The far-infrared spectrum of ¹²C₂HD

Abstract

The infrared spectrum of ¹²C₂HD has been studied using synchrotron radiation at the far-infrared beam line, Canadian Light Source, Saskatoon, Canada. The spectra were recorded at a resolution of 0.00096 cm⁻¹ in the 60 to 360 cm⁻¹ range using a Bruker IFS 125 Fourier transform spectrometer. In total, 821 vibration rotation lines were observed and assigned to the P(J), Q(J) and R(J) transitions of the ν ₅← ν ₄ difference band and associated hot bands with J″ up to 35 and (ν ₄ + ν ₅) up to 3. These new transitions were analysed together with 4518 transitions involving bending states with (ν ₄ + ν ₅) up to 3 available in the literature. The spectroscopic parameters obtained from the fit reproduce 4909 transitions with a standard deviation of 0.00028 cm⁻¹. The ν ₅← ν ₄ bands of ¹³CH¹²CD and ¹²CH¹³CD were also detected and analysed.

Keywords:

• deuterated acetylene
• ¹²C₂HD
• FIR spectrum
• bendings
• high resolution

Acknowledgements

All authors are indebted to Mr. Brant Billinghurst for recording the spectra. G. Di Lonardo and L. Fusina thank the University of Bologna and the MIUR (PRIN Trasferimento di energia e di carica: dalle collisioni ai processi dissipativi). M. Herman thanks the Fonds National de la Recherche Scientifique (F.R.S.-FNRS, contracts FRFC and IISN) and the ‘Action de Recherches Concertées de la Communauté française de Belgique’. A. Predoi-Cross is grateful for research support provided by the Natural Sciences and Engineering Research Council of Canada.