EOL Seminar: Accurate Spectroscopy of the Stable and Radioactive Carbon Isotopologues of CO₂

Date: 
Tuesday, November 13, 2018 - 15:30 to 16:30
Location: 
FL2-1022
Contact Name: 
Mike Reeves
Contact Email: 
Contact Phone: 
303-497-1029


Dr. Adam J. Fleisher
Research Chemist
National Institute of Standards and Technology

Achieving high accuracy in molecular spectroscopy requires both precise instrumentation and highly controlled sample conditions. Here we report continuous-wave laser cavity ring-down spectroscopy of 14C, 13C and 12C isotopologues of CO2, laboratory measurements which enable the retrieval of absolute isotopic amounts (14CO2) and amount ratios (13C/12C) within a sample. Leveraging highly accurate experimental measurements and ab ini-tio calculations of transitions intensities, we explore the gas-calibration-free optical sensing of trace isotopologues in both pure CO2 and CO2-in-air, as well as propose a path towards artifact-free scales in carbon isotope analysis with traceability to true invariants of nature.