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

Forskningsoutput: Tidskriftsbidrag › Artikel i vetenskaplig tidskrift › Peer review

Sammanfattning

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.

Originalspråk	engelska
Sidor (från-till)	3029-3033
Antal sidor	5
Tidskrift	Atmospheric Environment
Volym	43
Nummer	18
DOI	https://doi.org/10.1016/j.atmosenv.2009.02.034
Status	Published - 2009 juni
Externt publicerad	Ja

Ämnesklassifikation (UKÄ)

Atom- och molekylfysik och optik (Här ingår: Kemisk fysik, kvantoptik)
Annan kemiteknik

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10.1016/j.atmosenv.2009.02.034

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@article{f6dc0d737477478aad34e779b1697c29,

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",

issn = "1352-2310",

publisher = "Elsevier",

number = "18",

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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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SN - 1352-2310

VL - 43

SP - 3029

EP - 3033

JO - Atmospheric Environment

JF - Atmospheric Environment

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ER -

A photochemical reactor for studies of atmospheric chemistry

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