A photochemical reactor for studies of atmospheric chemistry
(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)
- author
- Nilsson, E. J.K. LU ; Eskebjerg, C. and Johnson, M. S. LU
- publishing date
- 2009-06
- 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
- 2022-04-26 03:31:20
@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}}, keywords = {{Atmospheric chemistry; Hydroxyl radical; Infrared spectroscopy; Photochemical reactor; Relative rate; Smog chamber}}, 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}}, }