Quantum Cascade Laser-Infrared Absorption Spectrometer for Clumped Methane Isotope Thermometry
DCO Instrument
DCO ID 11121/1781-8947-7171-9390-CC
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Overview
equipment for
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description
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Principal investigator Ono purchased key equipment in late 2012 and, as reported at the DCO International Science Meeting in March 2013, made rapid progress in building a prototype system for quantum cascade laser absorption spectroscopy. Preliminary test results are excellent and the initial DCO/Sloan investment will be leveraged by support from the U.S. National Science Foundation, which has recommended funding for the PI’s proposal for further research.
The research lead by the team confirmed earlier measurements by mass-spectrometer that most geologic methane follows expected thermodynamic abundance. They also demonstrated that methane samples from sites supporting active microbial methanogenesis (such as wetlands and cow rumens) and laboratory methanogen cultures carry unique non-statistical 13CH3D abundance. Currently the science team is applying the technique to test the origin of methane in various environments, including sites of serpentinization and marine hydrates
has documentation
- Clumped isotope effects during OH and Cl oxidation of methane
- Clumped isotopologue constraints on the origin of methane at seafloor hot springs
- Deep-biosphere methane production stimulated by geofluids in the Nankai accretionary complex
- Effect of 3-nitrooxypropanol on methane and hydrogen emissions, methane isotopic signature, and ruminal fermentation in dairy cows
- Experimental investigation on the controls of clumped isotopologue and hydrogen isotope ratios in microbial methane
- Exploring deep microbial life in coal-bearing sediment down to ~2.5 km below the ocean floor
- Fractionation of the methane isotopologues 13CH4, 12CH3D, and 13CH3D during aerobic oxidation of methane by Methylococcus capsulatus (Bath)
- Kinetic isotope effects of 12 CH3 D + OH and 13 CH3 D + OH from 278 to 313 K
- Measurement of a Doubly Substituted Methane Isotopologue, 13 CH 3 D, by Tunable Infrared Laser Direct Absorption Spectroscopy
- Nonequilibrium clumped isotope signals in microbial methane