Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - UV absorption cross-sections and atmospheric photolysis lifetimes of halogenated aldehydes
AU - Rattigan, OV
AU - Wild, O
AU - Cox, RA
PY - 1998/1/15
Y1 - 1998/1/15
N2 - UV absorption cross-sections for CCl3CHO, CCl2FCHO and CCIF2CHO have been determined over the wavelength range 200-370 nm and at temperatures in the range 298-243 K using a dual beam diode array spectrometer. The spectra show characteristic absorption due to the n --> pi* transition of the C=O group with absorption maxima around 300 nm. On substitution of Cl by F in the CX3 group the absorption maxima showed a shift to longer wavelengths and a corresponding increase in the intensity of the absorption in the region of atmospheric photolysis. With decreasing temperature, all three aldehydes showed a small non-negligible decrease in the cross-section in the long wavelength tail of the absorption band, and an increase in the cross-section around the absorption maxima. A two-dimensional photochemical model has been used to calculate atmospheric lifetimes due to photodissociation and OH radical loss. (C) 1998 Elsevier Science S.A.
AB - UV absorption cross-sections for CCl3CHO, CCl2FCHO and CCIF2CHO have been determined over the wavelength range 200-370 nm and at temperatures in the range 298-243 K using a dual beam diode array spectrometer. The spectra show characteristic absorption due to the n --> pi* transition of the C=O group with absorption maxima around 300 nm. On substitution of Cl by F in the CX3 group the absorption maxima showed a shift to longer wavelengths and a corresponding increase in the intensity of the absorption in the region of atmospheric photolysis. With decreasing temperature, all three aldehydes showed a small non-negligible decrease in the cross-section in the long wavelength tail of the absorption band, and an increase in the cross-section around the absorption maxima. A two-dimensional photochemical model has been used to calculate atmospheric lifetimes due to photodissociation and OH radical loss. (C) 1998 Elsevier Science S.A.
KW - RATE CONSTANTS
KW - halogenated aldehydes
KW - CHEMISTRY
KW - UV absorption cross-section
KW - atmospheric photolysis
U2 - 10.1016/S1010-6030(97)00250-5
DO - 10.1016/S1010-6030(97)00250-5
M3 - Journal article
VL - 112
SP - 1
EP - 7
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
SN - 1010-6030
IS - 1
ER -