OH and HO2 measurements using laser-induced fluorescence

James H. Mather; Philip S. Stevens; William H. Brune

doi:10.1029/96jd01702

OH and HO₂ measurements using laser-induced fluorescence

James H. Mather, Philip S. Stevens, William H. Brune

Meteorology and Atmospheric Science

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70 Scopus citations

Abstract

During August and September 1993 a laser-induced fluorescence (LIF) instrument was used to observe OH and HO₂ as part of the Tropospheric OH Photochemistry Experiment (TOHPE) in the mountains west of Boulder, Colorado. A prototype version of this instrument has been described previously. Modifications were made to the instrument for TOHPE, including the integration of a new dye laser. The instrument was calibrated by producing known amounts of OH and HO₂ above the instrument inlet. HO₂ was measured on 19 days during TOHPE, while OH was measured on 5 days. Although poor laser performance limited the detection limit to 1 to 2×10⁶ cm^-3 for an integration time of 300 s and a signal-to-noise ratio of 1, OH concentrations were observed to reach 3 to 7×10⁶ cm^-3 near midday. HO₂ typically peaked near 1×10⁸ cm^-3. HO₂ consistently reached its maximum near local noon. Observations made with the LIF instrument are compared with observations made with an ion-assisted technique.

Original language	English (US)
Pages (from-to)	6427-6436
Number of pages	10
Journal	Journal of Geophysical Research Atmospheres
Volume	102
Issue number	5
DOIs	https://doi.org/10.1029/96jd01702
State	Published - Mar 20 1997

All Science Journal Classification (ASJC) codes

Geophysics
Forestry
Oceanography
Aquatic Science
Ecology
Water Science and Technology
Soil Science
Geochemistry and Petrology
Earth-Surface Processes
Atmospheric Science
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science
Palaeontology

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10.1029/96jd01702

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title = "OH and HO2 measurements using laser-induced fluorescence",

abstract = "During August and September 1993 a laser-induced fluorescence (LIF) instrument was used to observe OH and HO2 as part of the Tropospheric OH Photochemistry Experiment (TOHPE) in the mountains west of Boulder, Colorado. A prototype version of this instrument has been described previously. Modifications were made to the instrument for TOHPE, including the integration of a new dye laser. The instrument was calibrated by producing known amounts of OH and HO2 above the instrument inlet. HO2 was measured on 19 days during TOHPE, while OH was measured on 5 days. Although poor laser performance limited the detection limit to 1 to 2×106 cm-3 for an integration time of 300 s and a signal-to-noise ratio of 1, OH concentrations were observed to reach 3 to 7×106 cm-3 near midday. HO2 typically peaked near 1×108 cm-3. HO2 consistently reached its maximum near local noon. Observations made with the LIF instrument are compared with observations made with an ion-assisted technique.",

author = "Mather, \{James H.\} and Stevens, \{Philip S.\} and Brune, \{William H.\}",

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doi = "10.1029/96jd01702",

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T1 - OH and HO2 measurements using laser-induced fluorescence

AU - Mather, James H.

AU - Stevens, Philip S.

AU - Brune, William H.

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N2 - During August and September 1993 a laser-induced fluorescence (LIF) instrument was used to observe OH and HO2 as part of the Tropospheric OH Photochemistry Experiment (TOHPE) in the mountains west of Boulder, Colorado. A prototype version of this instrument has been described previously. Modifications were made to the instrument for TOHPE, including the integration of a new dye laser. The instrument was calibrated by producing known amounts of OH and HO2 above the instrument inlet. HO2 was measured on 19 days during TOHPE, while OH was measured on 5 days. Although poor laser performance limited the detection limit to 1 to 2×106 cm-3 for an integration time of 300 s and a signal-to-noise ratio of 1, OH concentrations were observed to reach 3 to 7×106 cm-3 near midday. HO2 typically peaked near 1×108 cm-3. HO2 consistently reached its maximum near local noon. Observations made with the LIF instrument are compared with observations made with an ion-assisted technique.

AB - During August and September 1993 a laser-induced fluorescence (LIF) instrument was used to observe OH and HO2 as part of the Tropospheric OH Photochemistry Experiment (TOHPE) in the mountains west of Boulder, Colorado. A prototype version of this instrument has been described previously. Modifications were made to the instrument for TOHPE, including the integration of a new dye laser. The instrument was calibrated by producing known amounts of OH and HO2 above the instrument inlet. HO2 was measured on 19 days during TOHPE, while OH was measured on 5 days. Although poor laser performance limited the detection limit to 1 to 2×106 cm-3 for an integration time of 300 s and a signal-to-noise ratio of 1, OH concentrations were observed to reach 3 to 7×106 cm-3 near midday. HO2 typically peaked near 1×108 cm-3. HO2 consistently reached its maximum near local noon. Observations made with the LIF instrument are compared with observations made with an ion-assisted technique.

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OH and HO₂ measurements using laser-induced fluorescence

Abstract

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