Ab initio calculation of time-dependent control dynamics in polyelectronic systems involving bound and resonance states: Application to a quartet spectrum of He-

Komninos, Y; Mercouris, T; Nicolaides, CA

dc.contributor.author	Komninos, Y	en
dc.contributor.author	Mercouris, T	en
dc.contributor.author	Nicolaides, CA	en
dc.date.accessioned	2014-03-01T01:27:49Z
dc.date.available	2014-03-01T01:27:49Z
dc.date.issued	2008	en
dc.identifier.issn	1050-2947	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18592
dc.subject.classification	Optics	en
dc.subject.classification	Physics, Atomic, Molecular & Chemical	en
dc.subject.other	Electronic states	en
dc.subject.other	Perturbation techniques	en
dc.subject.other	Polyelectrolytes	en
dc.subject.other	Resonance	en
dc.subject.other	Schrodinger equation	en
dc.subject.other	Polyelectronic systems	en
dc.subject.other	Time-dependent probabilities	en
dc.subject.other	Helium	en
dc.title	Ab initio calculation of time-dependent control dynamics in polyelectronic systems involving bound and resonance states: Application to a quartet spectrum of He-	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevA.77.013412	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevA.77.013412	en
heal.identifier.secondary	013412	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	Using a pump-probe scheme with controllable time-delay in the range of 0-73 fs, we have solved from first principles the time-dependent Schrödinger equation (TDSE) describing a hyper-fast excitation process that involves both the discrete and the continuous spectrum of the three-electron atomic negative ion, He-. Two approaches were implemented, both using state-specific wave functions for two multiply excited discrete states (the initial state, He- 1s2s2p Po4, and the final state, He- 2 p3 So4), and one intermediate state which is a shape resonance (He- 1s2 p2 P4, including the underlying continuum of scattering states. The wavelengths of the two pulses connecting resonantly the states are in the infrared (10 080) and in the soft x-ray region (323 ). The first approach is analytic and solves the TDSE to first order in perturbation theory. This is acceptable for weak pulses whose duration is of the order of a few tens of femtoseconds. The second approach solves the TDSE nonperturbatively, via the state-specific expansion approach. A series of computations have produced time-dependent probabilities for preparing the triply excited bound state He- 2 p3 So4 for various combinations of the duration of the two pulses. Apart from providing the first such quantitative data, the results suggest the appearance of effects of short-time nonexponential decay of resonances when it becomes possible to monitor excitation with time-delayed short pulses. © 2008 The American Physical Society.	en
heal.publisher	AMER PHYSICAL SOC	en
heal.journalName	Physical Review A - Atomic, Molecular, and Optical Physics	en
dc.identifier.doi	10.1103/PhysRevA.77.013412	en
dc.identifier.isi	ISI:000252862000128	en
dc.identifier.volume	77	en
dc.identifier.issue	1	en