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3013933 
Journal Article 
Tropospheric photolysis rates of the acetaldehyde isotopologues CD₃CHO and CD₃CDO relative to CH₃CHO measured at the European Photoreactor Facility 
Nilsson, EJ; Heimdal, J; Bache-Andreassen, L; Johnson, MS; Nielsen, CJ 
2015 
1 
Journal of Physical Chemistry A
ISSN: 1089-5639
EISSN: 1520-5215 
119 
11 
2562-2567 
English 
25654214 
WOS:000351557300041 
Acetaldehyde is a hazardous pollutant found in indoor and ambient air. Acetaldehyde photolysis is pressure- and wavelength-dependent with three distinct product channels. In this study, the photolysis rates of CH3CHO, CD3CDO, and CD3CHO are studied in natural tropospheric conditions using long path FTIR spectroscopy, at the European Photoreactor Facility (EUPHORE) in Valencia, Spain. The average relative photolysis rate as an average of four experiments for the fully deuterated isotopologue is j(CH3CHO)/j(CD3CDO) = 1.75 ± 0.04, and as a result of a single experiment j(CH3CHO)/j(CD3CHO) = 1.10 ± 0.10. These results, combined with our previous determination of j(CH3CHO)/j(CH3CDO) = 1.26 ± 0.03, provide mechanistic insight into the photodissociation dynamics of the photoexcited species. Despite the extensive isotopic scrambling in photoexcited acetaldehyde that has recently been reported, the position of the substitution has a clear effect on the relative photolysis rates. 
Pollution Abstracts; Meteorological & Geoastrophysical Abstracts; Atmospheric pollution; Spectroscopy; Spain, Valencia; Photolysis; Troposphere; Kinetics; Indoor air pollution; P 0000:AIR POLLUTION; M2 551.510.5:General Description of Atmospheric Structure (551.510.5)