title: Experimental and theoretical double differential cross sections for electron impact ionization of methane.
abstract: Experimental and theoretical double differential cross sections (DDCSs) for electron-induced ionization of methane (CH4) are here reported for primary energies ranging from 50 eV to 350 eV and ejection angles between 25° and 130°. Experimental DDCSs are compared with theoretical predictions performed within the first Born approximation Coulomb wave. In this model, the initial molecular state is described by using single center wave functions, the incident (scattered) electron being described by a plane wave, while a Coulomb wave function is used for modeling the secondary ejected electron. A fairly good agreement may be observed between theory and experiment with nevertheless an expected systematic overestimation of the theory at low-ejection energies (<50 eV).
authors.affiliation: e-COL Laboratory, Department of Physics, Afyon Kocatepe University, Afyonkarahisar 03200, Turkey.
authors.forename: Murat
authors.initials: M
authors.lastname: Yavuz
authors.affiliation: e-COL Laboratory, Department of Physics, Afyon Kocatepe University, Afyonkarahisar 03200, Turkey.
authors.forename: Zehra Nur
authors.initials: ZN
authors.lastname: Ozer
authors.affiliation: e-COL Laboratory, Department of Physics, Afyon Kocatepe University, Afyonkarahisar 03200, Turkey.
authors.forename: Melike
authors.initials: M
authors.lastname: Ulu
authors.affiliation: Centre d'Etudes Nucléaires de Bordeaux Gradignan, CNRS/IN2P3, Université de Bordeaux, Gradignan 33170, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Champion
authors.affiliation: e-COL Laboratory, Department of Physics, Afyon Kocatepe University, Afyonkarahisar 03200, Turkey.
authors.forename: Mevlut
authors.initials: M
authors.lastname: Dogan