Absorption cross sections of C-13 ethane and propane isotopologues in the 3 mu m region

作者：Loh Alain^*; Wolff Marcus

来源：Journal of Quantitative Spectroscopy and Radiative Transfer, 2017, 203: 517-521.

DOI：10.1016/j.jqsrt.2017.05.012

• Ethane
• Propane
• C-13-isotopologues
• Fourier transform spectroscopy
• Infrared spectra
• Absorption cross section

To the best of our knowledge, we present first-time measurements of the absorption cross sections of C-13 ethane and propane isotopologues in the spectral region around 3000 cm(-1). The spectra of (CCH6)-C-13-C-12, (C2H6)-C-13 and (CC2H8)-C-13-C-12 have been recorded at approximate room temperature and atmospheric pressure for concentrations between 0.325% and 0.750% in nitrogen using an FTIR spectrometer with a resolution of 0.5 cm(-1). For calibration purposes an ethane and a propane spectrum each obtained with a natural isotopologue sample were compared to respective spectra from the Pacific Northwest National Laboratory (PNNL). The spectrum of (CCH6)-C-13-C-12 is shifted between 3.5 cm(-1) and 3.8 cm(-1) towards smaller wavenumbers compared to (C2H6)-C-12. The peaks of (CH6)-C-13-H-2 ethane were shifted between -4.4 cm(-1) and -7.2 cm(-1) relatively to the corresponding C-12 peaks. (CC2H3)-C-13-C-12 shows a wavenumber shift of 2 cm(-1) for the largest central peak at 2965.5 cm(-1) and -6.5 cm(-1) for the second largest peak at 2955 cm(-1). The newly determined cross sections will allow for the first time isotopologue-sensitive spectral analyses of ethane and propane in this spectral region and may be used for applications from atmospheric and planetary research to natural gas exploration.

• 出版日期2017-12