Femto-FT-CEAS investigation of rare acetylene isotopologues (H¹²C¹³CD, D¹²C¹³CH and D¹²C¹³CD)

Abstract

The infrared spectrum of a sample containing ¹³C mono-substituted isotopologues of acetylene, H¹²C¹³CH, H¹²C¹³CD, D¹²C¹³CH and D¹²C¹³CD has been recorded in the 6130−6800 cm^{− 1} region using a femto-Fourier transform-cavity enhanced absorption spectroscopy (femto-FT-CEAS) apparatus. Three bands for both H¹²C¹³CD and D¹²C¹³CH were observed and analysed, namely 2ν₁ − GS and associated hot bands from ν₄ and ν₅. The assignment of the 2ν₁ overtone already reported in the literature [J.L. Hardwick, Z.T. Martin, M.J. Pilkenton, E.N. Wolf, J. Mol. Spectrosc. 243, 10 (2007)] was considerably extended to higher J values. For the D¹²C¹³CD isotopologue, four bands were analysed, ν₁ + ν₂ + ν₃ − GS and associated hot bands from ν ₄ and ν ₅ and 2ν₁ + ν₄ + ν₅ − GS.

Keywords:

• infrared spectrum of acetylene isotopologues
• cavity enhanced spectroscopy
• H12C13CD
• D12C13CH
• D12C13CD

Acknowledgements

The Bologna group acknowledges the financial support of the Ministero dell’Istruzione dell’Università e della Ricerca (PRIN-09 ‘Spettroscopia molecolare per la Ricerca Atmosferica e Astrochimica: Esperimento, Teoria ed Applicazioni’) and the Alma Mater Studiorum Università di Bologna. The Belgian group thanks the ‘Action de Recherches Concertées de la Communauté française de Belgique’ and FNRS/FRIA for financial support.

Notes

^a In cm^{− 1}. For the definition of the band centre ν_C see text.

^b σ (in cm^{− 1}) corresponds to the standard deviation of the fit.