IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
A Sturmian approach for ionization processes of atoms and molecules
Autor/es:
L.U. ANCARANI, G. GASANEO, D.M. MITNIK, J.M. RANDAZZO, F.D. COLAVECCHIA, M.J. AMBROSIO, J.A. DELPUNTA, AND C.M. GRANADOS-CASTRO
Lugar:
Bochum
Reunión:
Congreso; 69th Annual Gaseous Electronics Conference; 2016
Institución organizadora:
American Physical Society
Resumen:
The Sturmian approach, using Generalized Sturmian Functions (GSF), is a spectral method that hasbeen applied successfully both for structure calculations [1] and for the study of several ionizationprocesses [2] with atomic targets. GSF are two-body functions that solve a Sturm-Liouville problem.They can be used as a basis set to deal with two- or three-body bound or scattering problems. Byconstruction, the whole GSF set can be chosen to possess asymptotic conditions appropriate for thephysical problem under consideration: bound-type behavior with a specic asymptotic charge arechosen for bound states, while { for example - outgoing behavior with a given adequate energy aretaken for solving scattering processes. This important intrinsic property makes GSF basis sets - andthus the whole approach - computationally ecient. In the case of ionization, a specic feature ofour methodology is that the scattering amplitude and the corresponding cross section are extracteddirectly from the asymptotic part of the scattering function without requiring the evaluation ofa matrix element. Compared to the case of many-electron atoms several extra challenges occurfor molecules: the scattering problem is generally multicenter and highly non-central, and themolecular orientation must also be taken into account. These features make the computationaltask much more cumbersome and expensive than for atomic targets. The Sturmian approach withGSF has been recently extended and implemented to study single ionization of small polyatomicmolecules by photon and electron impact [3]. Results for a variety of single and double ionizationprocesses will be presented.