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To the best of our knowledge, we present first-time measurements of the absorption cross sections of 13C ethane and propane isotopologues in the spectral region around 3000cm-1. The spectra of 13C12CH6, 13C2H6 and 13C12C2H8 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...
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