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

Bylicki, M; Nicolaides, CA

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