A photochemical reactor for studies of atmospheric chemistry

E. J.K. Nilsson; C. Eskebjerg; M. S. Johnson

doi:10.1016/j.atmosenv.2009.02.034

A photochemical reactor for studies of atmospheric chemistry

E. J.K. Nilsson, C. Eskebjerg, M. S. Johnson

University of Copenhagen

Research output: Contribution to journal › Article › peer-review

Abstract

A photochemical reactor for studies of atmospheric kinetics and spectroscopy has been built at the Copenhagen Center for Atmospheric Research. The reactor consists of a vacuum FTIR spectrometer coupled to a 100 L quartz cylinder by multipass optics mounted on electropolished stainless steel end flanges, surrounded by UV-A, UV-C and broadband sun lamps in a temperature-controlled housing. The combination of a quartz vessel and UV-C lamps allows higher concentrations of O(¹D) and OH than can be generated by similar chambers. The reactor is able to produce radical concentrations of ca. 8 × 10¹¹ cm^-3 for OH, 3 × 10⁶ cm^-3 for O(¹D), 3.3 × 10¹⁰ cm^-3 for O(³P) and 1.6 × 10¹² cm^-3 for Cl. The reactor can be operated at pressures from 10^-3 to 10³ mbar and temperatures from 240 to 330 K. As a test of the system we have studied the reaction CHCl₃ + Cl using the relative rate technique and find k_CHCl3+Cl/k_CH4+Cl = 1.03 ± 0.11, in good agreement with the accepted value.

Original language	English
Pages (from-to)	3029-3033
Number of pages	5
Journal	Atmospheric Environment
Volume	43
Issue number	18
DOIs	https://doi.org/10.1016/j.atmosenv.2009.02.034
Publication status	Published - 2009 Jun
Externally published	Yes

Subject classification (UKÄ)

Atom and Molecular Physics and Optics
Other Chemical Engineering

Free keywords

Atmospheric chemistry
Hydroxyl radical
Infrared spectroscopy
Photochemical reactor
Relative rate
Smog chamber

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10.1016/j.atmosenv.2009.02.034

Cite this

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title = "A photochemical reactor for studies of atmospheric chemistry",

abstract = "A photochemical reactor for studies of atmospheric kinetics and spectroscopy has been built at the Copenhagen Center for Atmospheric Research. The reactor consists of a vacuum FTIR spectrometer coupled to a 100 L quartz cylinder by multipass optics mounted on electropolished stainless steel end flanges, surrounded by UV-A, UV-C and broadband sun lamps in a temperature-controlled housing. The combination of a quartz vessel and UV-C lamps allows higher concentrations of O(1D) and OH than can be generated by similar chambers. The reactor is able to produce radical concentrations of ca. 8 × 1011 cm-3 for OH, 3 × 106 cm-3 for O(1D), 3.3 × 1010 cm-3 for O(3P) and 1.6 × 1012 cm-3 for Cl. The reactor can be operated at pressures from 10-3 to 103 mbar and temperatures from 240 to 330 K. As a test of the system we have studied the reaction CHCl3 + Cl using the relative rate technique and find kCHCl3+Cl/kCH4+Cl = 1.03 ± 0.11, in good agreement with the accepted value.",

keywords = "Atmospheric chemistry, Hydroxyl radical, Infrared spectroscopy, Photochemical reactor, Relative rate, Smog chamber",

author = "Nilsson, {E. J.K.} and C. Eskebjerg and Johnson, {M. S.}",

year = "2009",

month = jun,

doi = "10.1016/j.atmosenv.2009.02.034",

language = "English",

volume = "43",

pages = "3029--3033",

journal = "Atmospheric Environment",

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T1 - A photochemical reactor for studies of atmospheric chemistry

AU - Nilsson, E. J.K.

AU - Eskebjerg, C.

AU - Johnson, M. S.

PY - 2009/6

Y1 - 2009/6

N2 - A photochemical reactor for studies of atmospheric kinetics and spectroscopy has been built at the Copenhagen Center for Atmospheric Research. The reactor consists of a vacuum FTIR spectrometer coupled to a 100 L quartz cylinder by multipass optics mounted on electropolished stainless steel end flanges, surrounded by UV-A, UV-C and broadband sun lamps in a temperature-controlled housing. The combination of a quartz vessel and UV-C lamps allows higher concentrations of O(1D) and OH than can be generated by similar chambers. The reactor is able to produce radical concentrations of ca. 8 × 1011 cm-3 for OH, 3 × 106 cm-3 for O(1D), 3.3 × 1010 cm-3 for O(3P) and 1.6 × 1012 cm-3 for Cl. The reactor can be operated at pressures from 10-3 to 103 mbar and temperatures from 240 to 330 K. As a test of the system we have studied the reaction CHCl3 + Cl using the relative rate technique and find kCHCl3+Cl/kCH4+Cl = 1.03 ± 0.11, in good agreement with the accepted value.

AB - A photochemical reactor for studies of atmospheric kinetics and spectroscopy has been built at the Copenhagen Center for Atmospheric Research. The reactor consists of a vacuum FTIR spectrometer coupled to a 100 L quartz cylinder by multipass optics mounted on electropolished stainless steel end flanges, surrounded by UV-A, UV-C and broadband sun lamps in a temperature-controlled housing. The combination of a quartz vessel and UV-C lamps allows higher concentrations of O(1D) and OH than can be generated by similar chambers. The reactor is able to produce radical concentrations of ca. 8 × 1011 cm-3 for OH, 3 × 106 cm-3 for O(1D), 3.3 × 1010 cm-3 for O(3P) and 1.6 × 1012 cm-3 for Cl. The reactor can be operated at pressures from 10-3 to 103 mbar and temperatures from 240 to 330 K. As a test of the system we have studied the reaction CHCl3 + Cl using the relative rate technique and find kCHCl3+Cl/kCH4+Cl = 1.03 ± 0.11, in good agreement with the accepted value.

KW - Atmospheric chemistry

KW - Hydroxyl radical

KW - Infrared spectroscopy

KW - Photochemical reactor

KW - Relative rate

KW - Smog chamber

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DO - 10.1016/j.atmosenv.2009.02.034

M3 - Article

AN - SCOPUS:67349210741

SN - 1352-2310

VL - 43

SP - 3029

EP - 3033

JO - Atmospheric Environment

JF - Atmospheric Environment

IS - 18

ER -

A photochemical reactor for studies of atmospheric chemistry

Abstract

Subject classification (UKÄ)

Free keywords

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