We report, to our knowledge, the first optical detection scheme for short-chained hydrocarbon isotopologues. The sensor system is based on photoacoustic spectroscopy (PAS). Two continuous wave, thermoelectrically cooled, distributed feedback interband cascade lasers (DFB-ICLs) with emission wavelengths around 3.33 and 3.38 μm, respectively, served as light sources. investigations comprised main stable carbon isotopologues of methane (12CH4, 13CH4), ethane (12CH3-12CH3, 13CH3-12CH3,...

To the best of our knowledge, we present first-time measurements absorption cross sections 13C ethane and propane isotopologues in spectral region around 3000 cm-1. The spectra 13C12CH6, 13C2H6 13C12C2H8 have been recorded at approximate room temperature atmospheric pressure for concentrations between 0.325% 0.750% nitrogen using an FTIR spectrometer with a resolution 0.5 For calibration purposes spectrum each obtained natural isotopologue sample were compared to respective from Pacific...

We report, to our knowledge, the first optical detection of main isotopologues short-chained hydrocarbons. The sensor system is based on photoacoustic (also known as optoacoustic) spectroscopy (PAS, OAS). This technique takes advantage fact that absorbed electromagnetic radiation partially transferred into kinetic energy via inelastic molecular collisions. equivalent a temperature increase irradiated volume. If modulated, pressure wave with an amplitude proportional concentration absorbing...