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Title:Measurements doubly-substituted methane isotopologue (13CH3D and 12CH2D2) abudance using frequency stabilized mid-ir cavity ringdown spectroscopy
Author(s):Shen, Linhan
Contributor(s):Okumura, Mitchio; Bui, Thinh Quoc
Subject(s):Spectroscopy in Atmospheric Chemistry
Abstract:In this work, we demonstrated a spectroscopic method of measuring abundances of doubly-substituted methane isotopologues ($^{13}$CH$_{3}$D, $^{12}$CH$_2$D${2}$). In this method, we use a frequency stabilized cavity ringdown spectroscopy (FS-CRDS) technique to measure $\Delta$$^{12}$CH$_2$D${2}$ in naturally abundant methane to sub 0.1$\%$ level within one hour of average. Compare to traditional isotope-ratio mass spectrometer, which requires more than 24 hours of average to achieve comparable precision, this method provides a fast way of measuring clumped isotopologue abundance optically without destroying samples.
Issue Date:2016-06-20
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper/Presentation
Rights Information:Copyright 2016 by the authors
Date Available in IDEALS:2016-08-22

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