LINE MIXING EFFECTS OF O$_2$ A-BAND WITH PHOTOACOUSTIC SPECTROSCOPY IN SUPPORT OF REMOTE SENSING
Creators:Bui, Thinh Q.
Rupasinghe, Priyanka M.
Long, David A.
Hodges, Joseph T.
Miller, Charles E.
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Publisher:Ohio State University
To achieve NASA's strategic scientific mission of monitoring global atmospheric CO$_2$ at an unprecedented precision of å±0.25\%, we perform laser based measurements and lineshape studies of the reference atmospheric target O$_2$ A-band at 760nm to meet the precision requirements of current (ACOS/GOSAT/TCCON) and future (OCO-2/OCO-3/ASCENDS) remote sensing applications. We utilize a novel, high precision (å±0.01\% uncertainty) photoacoustic spectrometer (PAS), at high spectral resolution with a large dynamic range, to provide unique measurements of unsaturated lineshapes of the O$_2$ A-band to study line-mixing effects currently unaccounted for in spectroscopic databases like HITRAN. Line mixing effects along with other non-Voigt features (Dicke narrowing, collisional induced absorption) will be captured for remote sensing relevant pressures (0.1atm-5atm) and incorporated into a new spectral line profile. We discuss our progress towards this goal.
Author Institution: California Institute of Technology, Division of Chemistry, MC 127-72, Pasadena, CA 91125; NIST, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070; Jet Propulsion Laboratory, California Institute of Technology, MS 183-901, Pasadena, CA 91109