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GEOPHYSICAL RESEARCH LETTERS,
VOL. 23, NO. 22,
PAGES 3215–3218,
1996
Monitoring Potential Photochemical Interference in Laser-Induced Fluorescence Measurements of Atmospheric OH
Manvendra K. Dubey
Department of Chemistry, Harvard University, Cambridge, MA
Thomas F. Hanisco
Department of Chemistry, Harvard University, Cambridge, MA
Paul O. Wennberg
Department of Chemistry, Harvard University, Cambridge, MA
James G. Anderson
Department of Chemistry, Harvard University, Cambridge, MA
Abstract
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, C3F6, for the chemical removal of OH from the ambient air. The removal rate of OH by C3F6 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 C3F6 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.
Received 17
July
1996;
accepted 19
September
1996.
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Citation: Dubey, M. K., T. F. Hanisco, P. O. Wennberg, and J. G. Anderson
(1996),
Monitoring Potential Photochemical Interference in Laser-Induced Fluorescence Measurements of Atmospheric OH,
Geophys. Res. Lett.,
23(22),
3215–3218.
Copyright 1996 by the American Geophysical Union.
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