What is it about?
When natural gas (methane) is formed, a certain fraction of it has two heavy isotopes in one molecule. The proportion of such molecules is a measure of temperature, at which the methane was formed. We calibrated this "heavy isotope thermometer" at relevant temperatures.
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Why is it important?
The temperature at which methane was formed can pinpoint the methane's origin; it's thus a helpful tool for geochemistry.
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This page is a summary of: Comparison of Experimental vs Theoretical Abundances of 13CH3D and 12CH2D2 for Isotopically Equilibrated Systems from 1 to 500 °C, ACS Earth and Space Chemistry, October 2019, American Chemical Society (ACS),
DOI: 10.1021/acsearthspacechem.9b00244.
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