An airborne compatible photofragmentation two-photon laser-induced fluorescence instrument for measuring background tropospheric levels of NO, NO sub x , and NO sub 2

Journal Article · Wed Jun 20 00:00:00 EDT 1990 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JD095iD07p10155· OSTI ID:5456912

Sandholm, S T; Bradshaw, J D; Dorris, K S; Rodgers, M O; Davis, D D ^[1]

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1. Georgia Institute of Technology, Atlanta (USA)

Reported on is a photofragmentation two-photon laser-induced fluorescence (PF/TP-LIF) sensor with a demonstrated capability for making simultaneous measurements of NO/NO{sub x}/NO{sub 2}. This instrumental technique is based on the direct spectroscopic detection of NO via the TP-LIF methodology. The measurement of NO{sub x} (NO + NO{sub 2}), and subsequently NO{sub 2}, is accomplished by the photofragmentation of NO{sub 2} at 353 nm via a XeF excimer laser. The resultant NO photofragment is then quantitatively detected using the TP-LIF technique. The laser photolysis efficiency for NO{sub 2} is typically 60% for NO{sub 2} photolysis cell residence times of less than 0.5 s. The limit of detection (S/N = 2) for the described PF/TP-LIF instrument is 3.5 pptv for NO (2 min integration time) and 10 pptv for NO{sub 2} (6 min integration time). An assessment of chemical interferences in this system revealed no significant problems. The extension of the PF/TP-LIF methodology to the simultaneous detection of multiple N{sub x}O{sub y} species is discussed.

• OSTI ID: 5456912
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 95:D7; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

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