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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleElectron and positron scattering from 1,1-C2H2F2pt_BR
dc.contributor.authorMakochekanwa, Cpt_BR
dc.contributor.authorKato, Hpt_BR
dc.contributor.authorHoshino, Mpt_BR
dc.contributor.authorBettega, MHFpt_BR
dc.contributor.authorLima, MAPpt_BR
dc.contributor.authorSueoka, Opt_BR
dc.contributor.authorTanaka, Hpt_BR
unicamp.authorYamaguchi Univ, Fac Engn, Yamaguchi 7558611, Japan Sophia Univ, Dept Phys, Chiyoda Ku, Tokyo 102855, Japan Univ Fed Parana, Dept Fis, BR-81531990 Curitiba, Parana, Brazil Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazilpt_BR
dc.subject.wosTotal Cross-sectionspt_BR
dc.subject.wosEnergy Electronspt_BR
dc.description.abstract1,1-difluoroethylene (1,1-C2H2F2) molecules have been studied for the first time experimentally and theoretically by electron and positron impact. 0.4-1000 eV electron and 0.2-1000 eV positron impact total cross sections (TCSs) were measured using a retarding potential time-of-flight apparatus. In order to probe the resonances observed in the electron TCSs, a crossed-beam method was used to investigate vibrational excitation cross sections over the energy range of 1.3-49 eV and scattering angles 90 degrees and 120 degrees for the two loss energies 0.115 and 0.381 eV corresponding to the dominant C-H (nu(2) and nu(9)) stretching and the combined C-F (nu(3)) stretching and CH2 (nu(11)) rocking vibrations, respectively. Electron impact elastic integral cross sections are also reported for calculations carried out using the Schwinger multichannel method with pseudopotentials for the energy range from 0.5 to 50 eV in the static-exchange approximation and from 0.5 to 20 eV in the static-exchange plus polarization approximation. Resonance peaks observed centered at about 2.3, 6.5, and 16 eV in the TCSs have been shown to be mainly due to the vibrational and elastic channels, and assigned to the B-2, B-1, and A(1) symmetries, respectively. The pi* resonance peak at 1.8 eV in C2H4 is observed shifted to 2.3 eV in 1,1-C2H2F2 and to 2.5 eV in C2F4; a phenomenon attributed to the decreasing C=C bond length from C2H4 to C2F4. For positron impact a conspicuous peak is observed below the positronium formation threshold at about 1 eV, and other less pronounced ones centered at about 5 and 20 eV. (c) 2007 American Institute of
dc.relation.ispartofJournal Of Chemical Physicspt_BR
dc.relation.ispartofabbreviationJ. Chem. Phys.pt_BR
dc.publisherAmer Inst Physicspt_BR 28pt_BR
dc.identifier.citationJournal Of Chemical Physics. Amer Inst Physics, v. 126, n. 16, 2007.pt_BR
dc.sourceWeb of Sciencept_BR
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