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Monitoring potential photochemical interference in laser‐induced fluorescence Measurements of atmospheric OH
Author(s) -
Dubey Manvendra K.,
Hanisco Thomas F.,
Wennberg Paul O.,
Anderson James G.
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl03008
Subject(s) - troposphere , laser , analytical chemistry (journal) , interference (communication) , fluorescence , laser induced fluorescence , atmospheric pressure , excitation , pulse repetition frequency , range (aeronautics) , materials science , volumetric flow rate , chemistry , optics , atmospheric sciences , meteorology , physics , environmental chemistry , telecommunications , channel (broadcasting) , radar , electrical engineering , quantum mechanics , computer science , composite material , engineering
In situ laser‐induced fluorescence measurements of atmospheric OH are susceptible to interference from laser generated OH, particularly in the troposphere. To quantify this interference we implement the addition of perfluoropropene, C 3 F 6 , for the chemical removal of OH from the ambient air. The removal rate of OH by C 3 F 6 is determined in the laboratory using the discharge flow technique. Over the temperature range 249 to 296 K the rate constant is (6.0±0.8) × 10 −13 exp[(370±40)/T] cm³ molecule −1 s −1 , independent of pressure. In situ measurements using C 3 F 6 addition are performed in both aircraft‐borne and ground‐based experiments. These studies show that laser excitation of the ²Σ + (v=1)←²Π(v=0) transition (282 nm) at high pulse repetition rates and low peak power can provide reliable and sensitive measurements of tropospheric OH.