title: Elastic differential cross sections for C₄F₆ isomers in the 1.5-200 eV energy electron impact: similarities with six fluorine containing molecules and evidence of F-atom like scattering.
abstract: We report absolute elastic differential cross sections for electron interactions with the C4F6 isomers, hexafluoro-1,3-butadiene (1,3-C4F6), hexafluoro-2-butyne (2-C4F6), and hexafluorocyclobutene (c-C4F6). The incident electron energy range is 1.5-200 eV, and the scattered electron angular range for the differential measurements varies from 15° to 150°. In all cases the absolute scale of the differential cross section was set using the relative flow technique, with helium as the reference species. Atomic-like behaviour in these scattering systems is shown here for the first time, and is further investigated by comparing the elastic cross sections for the C4F6 isomers with other fluorinated molecules, such as SF6 and CnF6 (n = 2, 3, and 6). We note that for all the six-F containing molecules, the scattering process for electron energies above 30 eV is indistinguishable. Finally, we report results for calculations of elastic differential cross sections for electron scattering from each of these isomers, within an optical potential method and assuming a screened corrected independent atom representation. The level of agreement between these calculations and our measurements is found to be quite remarkable in all cases.
authors.affiliation: Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hoshino
authors.affiliation: Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan.
authors.forename: P
authors.initials: P
authors.lastname: Limão-Vieira
authors.affiliation: Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Anzai
authors.affiliation: Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kato
authors.affiliation: Department of Physics, Chungnam National University, Daejeon 305-764, South Korea.
authors.forename: H
authors.initials: H
authors.lastname: Cho
authors.affiliation: Research and Marketing Management Dept., New Products Development Div., Kanto Denka, Kogyo Co., Ltd., Chiyoda-ku, Tokyo 101-0063, Japan.
authors.forename: D
authors.initials: D
authors.lastname: Mogi
authors.affiliation: Shibukawa Development Research Lab., New Products Development Div., Kanto Denka Kogyo Co., Ltd., Shibukawa City, Gunma 377-8513, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Tanioka
authors.affiliation: Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
authors.forename: F
authors.initials: F
authors.lastname: Ferreira da Silva
authors.affiliation: Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
authors.forename: D
authors.initials: D
authors.lastname: Almeida
authors.affiliation: Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de Madrid, Avenida Complutense, 28040 Madrid, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Blanco
authors.affiliation: Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas (CSIC), Serrano 113-bis, 28006 Madrid, Spain.
authors.forename: G
authors.initials: G
authors.lastname: García
authors.affiliation: Department of Chemistry, Science Institute, University of Iceland, 107 Reykjavik, Iceland.
authors.forename: O
authors.initials: O
authors.lastname: Ingólfsson
authors.affiliation: Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Tanaka