Abstract
Accurate isotopic composition analysis of the greenhouse-gasses emitted in the atmosphere is an important step to mitigate global climate warnings. Optical frequency comb–based spectroscopic techniques have shown ideal performance to accomplish the simultaneous monitoring of the different isotope substituted species of such gases. The capabilities of one such technique, namely, direct comb Vernier spectroscopy, to determine the fractional isotopic ratio composition are discussed. This technique combines interferometric filtering of the comb source in a Fabry–Perot that contains the sample gas, with a high resolution dispersion spectrometer to resolve the spectral content of each interacting frequency inside of the Fabry–Perot. Following this methodology, simultaneous spectra of ro-vibrational transitions of CO and CO molecules are recorded and analyzed with an accurate fitting procedure. Fractional isotopic ratio C/C at 3% of precision is measured for a sample of CO gas, showing the potentialities of the technique for all isotopic-related applications of this important pollutant.
Highlights
Measuring the isotope ratio of chemical substances has a large variety of applications in environmental sciences [1,2,3,4,5]
Biomedical applications benefit from accurate fractional isotopic ratio measurements, in human breath analysis [18,19], where it is possible to detect biomarkers related to specific diseases or metabolic processes, or even in pharmacological research [20]
We report the capabilities of a slightly modified direct frequency comb dispersive spectroscopy (DFCDS) approach, called direct comb Vernier spectroscopy (DCVS) [29,35], to perform fractional ratio isotopic measurements in 12C16O2 and 13C16O2 components of a CO2 gas sample around 5005 cm−1
Summary
Measuring the isotope ratio of chemical substances (carbon, water, chlorine and so on) has a large variety of applications in environmental sciences [1,2,3,4,5]. Biomedical applications benefit from accurate fractional isotopic ratio measurements, in human breath analysis [18,19], where it is possible to detect biomarkers related to specific diseases or metabolic processes, or even in pharmacological research [20]. In very demanding biomedical applications (i.e., breath test for disease diagnosis or metabolic status monitoring), the accuracy and precision level for the R13C/12C isotopic ratio could be lower than 0.5% [24,25]
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