Generalized Sturmian Functions applied to double continuum problems

International Conference on Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces 2014

Ambrosio, M.J.^1,5 ; Colavecchia, F.D.^2,5 ; Mitnik, D.M.^1,5 ; Gasaneo, G.^3,5 ; Ancarani, L.U.^4

Instituto de Astronomía y Física Del Espacio, Argentina^1

División Física Atómica, Molecular y Óptica, Centro Atómico Bariloche, S. C. de Bariloche, Río Negro

8400, Argentina^2

Departamento de Física, Universidad Nacional Del sur, Bahía Blanca, Buenos Aires

8000, Argentina^3

Théorie, Modélisation, Simulation, SRSMC, Université de Lorraine, Metz

57078, France^4

Consejo Nacional de Investigaciones Cientificas y Técnicas, CONICET, Argentina^5

关键词: Collision problem;    Continuum problem;    Double ionization;    Electron impact;    Fully differential cross sections;    Scattering problems;    Sturmian functions;    Three-body problem;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/601/1/012004/pdf
DOI  :  10.1088/1742-6596/601/1/012004

来源: IOP

【 摘 要 】

The Generalized Sturmian Functions method aims to deal with atomic physics problems. It has seen application to two and three-body problems, and its flexibility enables one to work with bound systems as well as with particles in the continuum. In the present contribution we analyze how the method expands the atomic double continuum in collision problems, using the double ionization of Helium by fast electrons as a showcase. We first test the robustness of the method in a particularly challenging situation, the zero energy case. We then present fully differential cross sections for a scattering problem which after 15 years of continued efforts has not been satisfactorily solved: the double ionization of Helium by electron impact in the fast projectile regime, as measured by the Orsay group.