Absolute cross-sections for dissociative photoionization of some small esters

• Published in: International journal of mass spectrometry Vol. 292; no. 1; pp. 14 - 22
• Main Authors: Wang, Juan, Yang, Bin, Cool, Terrill A., Hansen, Nils
• Format: Journal Article
• Language: English
• Published: United States Elsevier B.V 01-05-2010; Elsevier
• Subjects: ADVANCED LIGHT-SOURCE; BIODIESEL SURROGATE; Biofuel; Combustion chemistry; Ester; ETHYL FORMATE; FUEL-RICH FLAMES; GAS-PHASE; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; IONIZATION POTENTIALS; IONIZED METHYL ACETATE; MASS-SPECTROMETRY; PHOTOELECTRON-SPECTRA; Photoionization cross-section; Photoionization mass spectrometry (PIMS); UNIMOLECULAR DISSOCIATION; Ester; Combustion chemistry; Biofuel; Photoionization mass spectrometry (PIMS); Photoionization cross-section
• ISSN: 1387-3806; 1873-2798
• DOI: 10.1016/j.ijms.2010.02.010

The first measurements of absolute cross-sections for near-threshold molecular and dissociative photoionization are presented for 11 small esters (methyl formate, ethyl formate, vinyl acetate, methyl propanoate, ethyl propanoate, methyl butanoate, methyl isobutanoate, methyl propenoate, ethyl propenoate, methyl crotonate, and methyl methacrylate).
The first measurements of absolute cross-sections for near-threshold molecular and dissociative photoionization are presented for 11 small esters (methyl formate, ethyl formate, vinyl acetate, methyl propanoate, ethyl propanoate, methyl butanoate, methyl isobutanoate, methyl propenoate, ethyl propenoate, methyl crotonate, and methyl methacrylate). Photoionization mass spectrometry (PIMS) is employed with an energy resolution of 40
meV (fwhm) using a monochromated VUV synchrotron light source. An extensive literature exploring isomerization/dissociation mechanisms is available for six of these molecules. There are, however, no previous observations of dissociative ionization for four simple monounsaturated esters (methyl propenoate, ethyl propenoate, methyl crotonate, and methyl methacrylate), and dissociative ionization of ethyl propanoate has received scant attention. Appearance energies for dissociative photofragment ions of these five molecules are presented.