TY - RPRT TI - Discrete sample introduction module for quantitative and isotopic analysis of methane and other gases by cavity ring-down spectroscopy AU - John Pohlman AU - Michael Casso AU - Cedric Magen AU - Emile M. Bergeron PY - 2021 DO - 10.1021/acs.est.1c01386 UR - https://pubs.usgs.gov/publication/70223676 ID - 70223676 ER -