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J Chem Phys

Title:		Electronic spectroscopy of methyl vinyl ketone oxide: A four-carbon unsaturated Criegee intermediate from isoprene ozonolysis
Author(s):		Vansco MF; Marchetti B; Lester MI;
Address:		"Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA"
Journal Title:		J Chem Phys
Year:		2018
Volume:		149
Issue:		24
Page Number:		244309 -
DOI:		10.1063/1.5064716
ISSN/ISBN:		1089-7690 (Electronic) 0021-9606 (Linking)
Abstract:		"Ozonolysis of isoprene, one of the most abundant volatile organic compounds in the atmosphere, proceeds through methyl vinyl ketone oxide (MVK-oxide), methacrolein oxide, and formaldehyde oxide (CH(2)OO) Criegee intermediates. The present study focuses on MVK-oxide, a four-carbon unsaturated carbonyl oxide intermediate, using vacuum ultraviolet photoionization at 118 nm and UV-visible induced depletion of the m/z = 86 mass channel to characterize its first pi(*) <-- pi electronic transition. The electronic spectrum is broad and unstructured with its peak at 388 nm (3.2 eV). The MVK-oxide spectrum is shifted to a significantly longer wavelength than CH(2)OO and alkyl-substituted Criegee intermediates studied previously due to extended conjugation across the vinyl and carbonyl oxide groups. Electronic excitation results in rapid dissociation at lambda
Keywords:
Notes:		"PubMed-not-MEDLINEVansco, Michael F Marchetti, Barbara Lester, Marsha I eng 2019/01/03 J Chem Phys. 2018 Dec 28; 149(24):244309. doi: 10.1063/1.5064716"