Charge-exchange mass spectra of ethyl acetate, methyl proprionate and propyl formate

Abstract

The absolute cross-sections, Q, for the charge exchange in the gas phase between twenty eight primary positive ions of known electron recombination energy, E, and three isomeric esters, ethyl acetate, methyl proprionate and propyl formate, have been measured. A plot of Q against E for a particular product ion constitutes a charge-exchange mass spectrum, c.e.m.s., from which the product ion's appearance potential is directly obtained. The appearance potentials of the three esters and eleven of their principle ionic fragments are reported.