Single and double photoionization cross sections of the He- 1s2s2p P-4(0) state at and far from threshold, from the many-electron, many-photon theory

Haritos, C; Mercouris, T; Nicolaides, CA

dc.contributor.author	Haritos, C	en
dc.contributor.author	Mercouris, T	en
dc.contributor.author	Nicolaides, CA	en
dc.date.accessioned	2014-03-01T11:45:42Z
dc.date.available	2014-03-01T11:45:42Z
dc.date.issued	1998	en
dc.identifier.issn	0953-4075	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/37563
dc.subject.classification	Optics	en
dc.subject.classification	Physics, Atomic, Molecular & Chemical	en
dc.subject.other	2-ELECTRON IONIZATION LADDER	en
dc.subject.other	PHOTODETACHMENT	en
dc.subject.other	ION	en
dc.subject.other	RESONANCES	en
dc.subject.other	AFFINITY	en
dc.subject.other	WIDTHS	en
dc.subject.other	HE-2S	en
dc.subject.other	P-3	en
dc.title	Single and double photoionization cross sections of the He- 1s2s2p P-4(0) state at and far from threshold, from the many-electron, many-photon theory	en
heal.type	other	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	We report values for the single-photoionization cross sections to the S-3 and P-3(0) channels and for the total double photoionization cross section, sigma(++)(E), of the metastable He- 1s2s2p P-4(0) state, obtained from the implementation of the state-specific, complex eigenvalue many-electron, many-photon theory (MEMPT). The sigma(++)(E) rises from 0 at E = 0 to a maximum of about 1.0 x 10(-20) cm(2) at E similar to 3-5 eV and dies out around 30 eV. For this quantity, comparison with the measurements of Bae et al for E = 0.0-0.4 eV and with the semiclassical calculations of Crothers and Lennon, reveals disagreement. The effect of initial-state correlation in this case is quantitative but not qualitative.	en
heal.publisher	IOP PUBLISHING LTD	en
heal.journalName	JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS	en
dc.identifier.isi	ISI:000076596900005	en
dc.identifier.volume	31	en
dc.identifier.issue	19	en
dc.identifier.spage	L783	en
dc.identifier.epage	L791	en