Electronic State Spectroscopy Of Acetaldehyde, CH3CHO, By High ...

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Download Free PDFElectronic state spectroscopy of acetaldehyde, CH3CHO, by high-resolution VUV photo-absorptionNigel Mason

2003, Chemical Physics Letters

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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 jCH3CHO/jCD3CDO = 1.75 ± 0.04, and as a result of a single experiment jCH3CHO/jCD3CHO = 1.10 ± 0.10. These results, combined with our previous determination of jCH3CHO/jCH3CDO = 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.

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