TY - JOUR
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
UR - http://www.scopus.com/inward/record.url?scp=67349210741&partnerID=8YFLogxK
U2 - 10.1016/j.atmosenv.2009.02.034
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 -