New approach for approximating the continuum wave function by Gaussian basis set

A new approach for approximating the continuum wave functions for hydrogenic atoms with Gaussians basis sets is developed and tested. In this the plane wave is left unchanged and the distorting factor, represented by the Confluent Hypergeometric function, is expanded as a sum of Spherical Harmonics...

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Autores principales:	Fiori, M., Miraglia, J.E.
Formato:	JOUR
Materias:	Coulomb functions Ionization Minimization and fitting Wave functions and integrals Atomic and molecular collision Atomic form factors Basis sets Confluent hypergeometric functions Exact results First Born approximation Gaussian basis sets Gaussians Hydrogenic atoms Ionization cross section Momentum conservations Partial waves Plane wave Spherical harmonics Spherical waves Approximation theory Atoms Born approximation Harmonic analysis High energy physics Hydrogen Wave functions Elastic waves
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00104655_v183_n12_p2528_Fiori
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00104655_v183_n12_p2528_Fiori
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spelling	todo:paper_00104655_v183_n12_p2528_Fiori2023-10-03T14:09:08Z New approach for approximating the continuum wave function by Gaussian basis set Fiori, M. Miraglia, J.E. Coulomb functions Ionization Minimization and fitting Wave functions and integrals Atomic and molecular collision Atomic form factors Basis sets Confluent hypergeometric functions Coulomb functions Exact results First Born approximation Gaussian basis sets Gaussians Hydrogenic atoms Ionization cross section Momentum conservations Partial waves Plane wave Spherical harmonics Spherical waves Approximation theory Atoms Born approximation Harmonic analysis High energy physics Hydrogen Ionization Wave functions Elastic waves A new approach for approximating the continuum wave functions for hydrogenic atoms with Gaussians basis sets is developed and tested. In this the plane wave is left unchanged and the distorting factor, represented by the Confluent Hypergeometric function, is expanded as a sum of Spherical Harmonics multiplied by a series of Gaussians. In this way the number of spherical waves and Gaussians will be significantly reduced and the plane wave will be responsible for the momentum conservation. As compared with previous methods that expand the full continuum, including the plane wave, our strategy does not require a great quantity of partial waves for convergence. Dense oscillations which are characteristic of the plane wave, are avoided. To test the performance of this approximation to describe a free-bound atomic form factor, the ionization cross section of hydrogen by impact of protons in first Born approximation is calculated. Compared with the exact results, a good agreement with just 4 spherical waves and ten Gaussians each is obtained. The method looks very interesting, especially to speed up atomic and molecular collision calculations involving the continuum. © 2012 Elsevier B.V. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00104655_v183_n12_p2528_Fiori
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Coulomb functions Ionization Minimization and fitting Wave functions and integrals Atomic and molecular collision Atomic form factors Basis sets Confluent hypergeometric functions Coulomb functions Exact results First Born approximation Gaussian basis sets Gaussians Hydrogenic atoms Ionization cross section Momentum conservations Partial waves Plane wave Spherical harmonics Spherical waves Approximation theory Atoms Born approximation Harmonic analysis High energy physics Hydrogen Ionization Wave functions Elastic waves
spellingShingle	Coulomb functions Ionization Minimization and fitting Wave functions and integrals Atomic and molecular collision Atomic form factors Basis sets Confluent hypergeometric functions Coulomb functions Exact results First Born approximation Gaussian basis sets Gaussians Hydrogenic atoms Ionization cross section Momentum conservations Partial waves Plane wave Spherical harmonics Spherical waves Approximation theory Atoms Born approximation Harmonic analysis High energy physics Hydrogen Ionization Wave functions Elastic waves Fiori, M. Miraglia, J.E. New approach for approximating the continuum wave function by Gaussian basis set
topic_facet	Coulomb functions Ionization Minimization and fitting Wave functions and integrals Atomic and molecular collision Atomic form factors Basis sets Confluent hypergeometric functions Coulomb functions Exact results First Born approximation Gaussian basis sets Gaussians Hydrogenic atoms Ionization cross section Momentum conservations Partial waves Plane wave Spherical harmonics Spherical waves Approximation theory Atoms Born approximation Harmonic analysis High energy physics Hydrogen Ionization Wave functions Elastic waves
description	A new approach for approximating the continuum wave functions for hydrogenic atoms with Gaussians basis sets is developed and tested. In this the plane wave is left unchanged and the distorting factor, represented by the Confluent Hypergeometric function, is expanded as a sum of Spherical Harmonics multiplied by a series of Gaussians. In this way the number of spherical waves and Gaussians will be significantly reduced and the plane wave will be responsible for the momentum conservation. As compared with previous methods that expand the full continuum, including the plane wave, our strategy does not require a great quantity of partial waves for convergence. Dense oscillations which are characteristic of the plane wave, are avoided. To test the performance of this approximation to describe a free-bound atomic form factor, the ionization cross section of hydrogen by impact of protons in first Born approximation is calculated. Compared with the exact results, a good agreement with just 4 spherical waves and ten Gaussians each is obtained. The method looks very interesting, especially to speed up atomic and molecular collision calculations involving the continuum. © 2012 Elsevier B.V. All rights reserved.
format	JOUR
author	Fiori, M. Miraglia, J.E.
author_facet	Fiori, M. Miraglia, J.E.
author_sort	Fiori, M.
title	New approach for approximating the continuum wave function by Gaussian basis set
title_short	New approach for approximating the continuum wave function by Gaussian basis set
title_full	New approach for approximating the continuum wave function by Gaussian basis set
title_fullStr	New approach for approximating the continuum wave function by Gaussian basis set
title_full_unstemmed	New approach for approximating the continuum wave function by Gaussian basis set
title_sort	new approach for approximating the continuum wave function by gaussian basis set
url	http://hdl.handle.net/20.500.12110/paper_00104655_v183_n12_p2528_Fiori
work_keys_str_mv	AT fiorim newapproachforapproximatingthecontinuumwavefunctionbygaussianbasisset AT miragliaje newapproachforapproximatingthecontinuumwavefunctionbygaussianbasisset
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New approach for approximating the continuum wave function by Gaussian basis set

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