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Theoretical resolution of the H- resonance spectrum up to the n=4 threshold. II. States of S-1 and D-1 symmetries

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dc.contributor.author Bylicki, M en
dc.contributor.author Nicolaides, CA en
dc.date.accessioned 2014-03-01T01:50:31Z
dc.date.available 2014-03-01T01:50:31Z
dc.date.issued 2000 en
dc.identifier.issn 1050-2947 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/26042
dc.subject.classification Optics en
dc.subject.classification Physics, Atomic, Molecular & Chemical en
dc.subject.other DOUBLY-EXCITED-STATES en
dc.subject.other 2-ELECTRON IONIZATION LADDER en
dc.subject.other ELECTRON-HYDROGEN SCATTERING en
dc.subject.other ATOMIC-HYDROGEN en
dc.subject.other CLASSIFICATION en
dc.subject.other EXCITATION en
dc.subject.other IMPACT en
dc.subject.other WIDTHS en
dc.subject.other ION en
dc.title Theoretical resolution of the H- resonance spectrum up to the n=4 threshold. II. States of S-1 and D-1 symmetries en
heal.type journalArticle en
heal.identifier.secondary 052509 en
heal.language English en
heal.publicationDate 2000 en
heal.abstract The resonance spectrum of H- for S-1 and D-1) symmetries up to the n = 4 threshold has been computed by solving the corresponding complex eigenvalue Schrodinger equation in terms of basis functions of real and complex coordinates. These functions are chosen and optimized judiciously and systematically in order to account for the specific details of electronic structure, electron correlation, and multistate and multichannel couplings characterizing the problem. Large sets of Slater orbitals, extending in a regular manner to about 8000 atomic units, were employed in order to describe properly the full range and especially the large-r behavior of the localized part of these resonances, as their energy approaches their corresponding threshold. Energies, widths, and wave-function characteristics are presented for 33 S-1 states and 37 D-1 states having widths down to about 1 x 10(-9) a.u. Of this total of 70 states, only 32 have been identified before via the application of different theoretical approaches, or, for very few of them, in scattering experiments. By adopting the Gailitis-Damburg model of dipole resonances as the relevant zero order model, we identify unperturbed and perturbed spectral series, in analogy with the well-known spectra of neutral atoms or positive ions, where the zero-order model is based on the Rydberg spectrum of the 1/r Coulomb potential. For perturbed spectra, only rough correspondence can be made with the smooth series predictions of the zero-order model. By achieving many-digit numerical precision for our results, we demonstrate the occasional presence of unique irregularities associated with each threshold, such as the existence of overlapping resonances and of "loner" resonances (i.e., not belonging to any series) below and above threshold. An example for the latter is a D-1 shape resonance above the n = 3 threshold. This state was already identified by Ho and Bhatia [Phys. Rev. A 48, 3720 (1993)]. However, our values for the energy above threshold (Delta E = 0.49497 meV) and for the width (Gamma = 8.632 meV) differ significantly from theirs ((Delta E = 116.94 meV and Gamma = 157 meV). en
heal.publisher AMERICAN PHYSICAL SOC en
heal.journalName PHYSICAL REVIEW A en
dc.identifier.isi ISI:000086953200050 en
dc.identifier.volume 61 en
dc.identifier.issue 5 en
dc.identifier.spage art. no. en
dc.identifier.epage 052509 en


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