title: Novel approach to the semi-empirical universal theory for secondary electron yield.
abstract: The universal semi-empirical equation has been commonly used to quantitatively describe the energy dependence of the secondary electron yield (SEY). It is even used as a first reliability test for experimental data. The equation is based on the assumption that the stopping power is constant along the electron trajectory. In this article, we derive a novel analytical expression based on a more advanced model which considers linear stopping power dependence on penetration depth. Although coinciding with the universal equation at low energies, the novel function has lower intensity in the higher energy range. The models were compared with experimental SEY data of different metals, taken from literature, as well as freshly cleaved highly oriented pyrolytic graphite, measured in the frame of this work. It is confirmed that the novel expression better describes the experimental data.
authors.affiliation: CeFITec, Department of Physics, Universidade Nova de Lisboa, Campus de Caparica, Portugal. n.bundaleski@fct.unl.pt
authors.forename: N
authors.initials: N
authors.lastname: Bundaleski
authors.forename: B J
authors.initials: BJ
authors.lastname: Shaw
authors.forename: A G
authors.initials: AG
authors.lastname: Silva
authors.forename: A M C
authors.initials: AM
authors.lastname: Moutinho
authors.forename: O M N D
authors.initials: OM
authors.lastname: Teodoro
mesh_terms: D000465:Algorithms; D004583:Electrons; D004735:Energy Transfer; D006108:Graphite / Q000737:chemistry; D056951:Photoelectron Spectroscopy; D013499:Surface Properties
chemical_list: D006108:Graphite