Advanced

A photochemical reactor for studies of atmospheric chemistry

Nilsson, E. J.K. LU ; Eskebjerg, C. and Johnson, M. S. LU (2009) In Atmospheric Environment 43(18). p.3029-3033
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... (More)

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.

(Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Atmospheric chemistry, Hydroxyl radical, Infrared spectroscopy, Photochemical reactor, Relative rate, Smog chamber
in
Atmospheric Environment
volume
43
issue
18
pages
5 pages
publisher
Elsevier
external identifiers
  • scopus:67349210741
ISSN
1352-2310
DOI
10.1016/j.atmosenv.2009.02.034
language
English
LU publication?
no
id
f6dc0d73-7477-478a-ad34-e779b1697c29
date added to LUP
2019-07-15 13:54:46
date last changed
2020-01-22 07:43:46
@article{f6dc0d73-7477-478a-ad34-e779b1697c29,
  abstract     = {<p>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(<sup>1</sup>D) and OH than can be generated by similar chambers. The reactor is able to produce radical concentrations of ca. 8 × 10<sup>11</sup> cm<sup>-3</sup> for OH, 3 × 10<sup>6</sup> cm<sup>-3</sup> for O(<sup>1</sup>D), 3.3 × 10<sup>10</sup> cm<sup>-3</sup> for O(<sup>3</sup>P) and 1.6 × 10<sup>12</sup> cm<sup>-3</sup> for Cl. The reactor can be operated at pressures from 10<sup>-3</sup> to 10<sup>3</sup> mbar and temperatures from 240 to 330 K. As a test of the system we have studied the reaction CHCl<sub>3</sub> + Cl using the relative rate technique and find k<sub>CHCl3+Cl</sub>/k<sub>CH4+Cl</sub> = 1.03 ± 0.11, in good agreement with the accepted value.</p>},
  author       = {Nilsson, E. J.K. and Eskebjerg, C. and Johnson, M. S.},
  issn         = {1352-2310},
  language     = {eng},
  number       = {18},
  pages        = {3029--3033},
  publisher    = {Elsevier},
  series       = {Atmospheric Environment},
  title        = {A photochemical reactor for studies of atmospheric chemistry},
  url          = {http://dx.doi.org/10.1016/j.atmosenv.2009.02.034},
  doi          = {10.1016/j.atmosenv.2009.02.034},
  volume       = {43},
  year         = {2009},
}