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

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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

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