Site specific photochemical reaction of PMMA and related polymers by inner shell electron excitation

摘要

The photoion desorption by inner shell electron excitation from solid films of poly(methyl methacrylate), poly(methyl acrylate) and poly(methacrylic acid) was studied. The assignment of the features observed in the absorption spectrum of PMMA was elucidated by a systematic comparison of the H~+ yield spectra of the three polymers. Detailed information about the specific excitations that promote the desorption of CH_3~+ ions was obtained both in the carbon and oxygen K-edge regions. It was observed that most of the PMMA CH_3~+ ions are desorbed by the fragmentation at the side chain.