A photochemical reactor for studies of atmospheric chemistry

Elna Johanna Kristina Nilsson; Carsten Eskebjerg; Matthew Stanley Johnson

A photochemical reactor for studies of atmospheric chemistry

Elna Johanna Kristina Nilsson, Carsten Eskebjerg, Matthew Stanley Johnson

Department of Chemistry

43 Citations (Scopus)

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 cm3 for O(1D), 3.3 1010 cm3 for O(3P) and 1.6 1012 cm3 for Cl. The reactor can be
operated at pressures from 103 to 103 mbar and temperatures from 240 to 330 K. As a test of the system
we have studied the reaction CHCl3 þ Cl using the relative rate technique and find kCHCl3þCl/
kCH4þCl ¼ 1.03 0.11, in good agreement with the accepted value.

Original language	English
Journal	Atmospheric Environment
Volume	43
Pages (from-to)	3029-3033
Number of pages	5
ISSN	1352-2310
Publication status	Published - 16 Feb 2009

Cite this

@article{8ce0ffe005cb11df825d000ea68e967b,

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

abstract = "A photochemical reactor for studies of atmospheric kinetics and spectroscopy has been built at theCopenhagen Center for Atmospheric Research. The reactor consists of a vacuum FTIR spectrometercoupled to a 100 L quartz cylinder by multipass optics mounted on electropolished stainless steel endflanges, surrounded by UV-A, UV-C and broadband sun lamps in a temperature-controlled housing. Thecombination of a quartz vessel and UV-C lamps allows higher concentrations of O(1D) and OH than canbe generated by similar chambers. The reactor is able to produce radical concentrations of ca. 8 1011 cm3 for OH, 3 106 cm3 for O(1D), 3.3 1010 cm3 for O(3P) and 1.6 1012 cm3 for Cl. The reactor can beoperated at pressures from 103 to 103 mbar and temperatures from 240 to 330 K. As a test of the systemwe have studied the reaction CHCl3 {\th} Cl using the relative rate technique and find kCHCl3{\th}Cl/kCH4{\th}Cl ¼ 1.03 0.11, in good agreement with the accepted value.",

author = "Nilsson, {Elna Johanna Kristina} and Carsten Eskebjerg and Johnson, {Matthew Stanley}",

note = "Paper id:: doi: 10.1016/j.atmosenv.2009.02.034",

year = "2009",

month = feb,

day = "16",

language = "English",

volume = "43",

pages = "3029--3033",

journal = "Atmospheric Environment",

issn = "1352-2310",

publisher = "Pergamon Press",

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TY - JOUR

T1 - A photochemical reactor for studies of atmospheric chemistry

AU - Nilsson, Elna Johanna Kristina

AU - Eskebjerg, Carsten

AU - Johnson, Matthew Stanley

N1 - Paper id:: doi: 10.1016/j.atmosenv.2009.02.034

PY - 2009/2/16

Y1 - 2009/2/16

N2 - A photochemical reactor for studies of atmospheric kinetics and spectroscopy has been built at theCopenhagen Center for Atmospheric Research. The reactor consists of a vacuum FTIR spectrometercoupled to a 100 L quartz cylinder by multipass optics mounted on electropolished stainless steel endflanges, surrounded by UV-A, UV-C and broadband sun lamps in a temperature-controlled housing. Thecombination of a quartz vessel and UV-C lamps allows higher concentrations of O(1D) and OH than canbe generated by similar chambers. The reactor is able to produce radical concentrations of ca. 8 1011 cm3 for OH, 3 106 cm3 for O(1D), 3.3 1010 cm3 for O(3P) and 1.6 1012 cm3 for Cl. The reactor can beoperated at pressures from 103 to 103 mbar and temperatures from 240 to 330 K. As a test of the systemwe have studied the reaction CHCl3 þ Cl using the relative rate technique and find kCHCl3þCl/kCH4þCl ¼ 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 theCopenhagen Center for Atmospheric Research. The reactor consists of a vacuum FTIR spectrometercoupled to a 100 L quartz cylinder by multipass optics mounted on electropolished stainless steel endflanges, surrounded by UV-A, UV-C and broadband sun lamps in a temperature-controlled housing. Thecombination of a quartz vessel and UV-C lamps allows higher concentrations of O(1D) and OH than canbe generated by similar chambers. The reactor is able to produce radical concentrations of ca. 8 1011 cm3 for OH, 3 106 cm3 for O(1D), 3.3 1010 cm3 for O(3P) and 1.6 1012 cm3 for Cl. The reactor can beoperated at pressures from 103 to 103 mbar and temperatures from 240 to 330 K. As a test of the systemwe have studied the reaction CHCl3 þ Cl using the relative rate technique and find kCHCl3þCl/kCH4þCl ¼ 1.03 0.11, in good agreement with the accepted value.

M3 - Journal article

SN - 1352-2310

VL - 43

SP - 3029

EP - 3033

JO - Atmospheric Environment

JF - Atmospheric Environment

ER -