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Analysis of X-ray photoelectron spectra of eight polymers by deMon density-functional calculations using the model oligomers

TitleAnalysis of X-ray photoelectron spectra of eight polymers by deMon density-functional calculations using the model oligomers
Publication TypeJournal Article
Year of Publication1996
AuthorsEndo, K, Kaneda, Y, Okada, H, Chong, DP, Duffy, P
JournalJournal of Physical Chemistry
Volume100
Pagination19455-19460
Date PublishedDec
Type of ArticleArticle
ISBN Number0022-3654
KeywordsAPPROXIMATION, CORE, ELECTRON BINDING-ENERGIES, LOCAL-DENSITY, MOLECULES, POLY(METHYL METHACRYLATE), POLY(VINYL ALCOHOL), SEMIEMPIRICAL MO, theory, VALENCE ENERGY-LEVELS, XPS SPECTRA
Abstract

The X-ray photoelectron spectra of eight polymers [(CH2CH2)(n), (CH2CH2NH)(n), (CH2O)(n), (CH2CH2S)(n), (CH(2)CHX)(n), and (CH(2)CX(2))(n) (X = F, Cl)] were analyzed by the deMon density-functional method using the model oligomers. Calculated AIK a valence photoelectron spectra were obtained using Gaussian line shape functions of an approximate Line width (0.10I(k)), where I-k = I-k’ - WD, I-k’ is the vertical ionization potential of each MO, and WD is a shift to account for sample work function, polarization energy, and other effects. The theoretical spectra showed good agreement with the experimental spectra of the polymers between 0 and 40 eV. The core-electron binding energies (CEBEs) of C1s, N1s, O1s, F1s, S2p, and Cl2p of the model oligomers were calculated by unrestricted generalized transition-state models. The difference between the calculated and the experimental CEBEs reflects the trend in WDs of the polymers.

URL<Go to ISI>://A1996VX87500039