Attosecond dynamics of electron correlation in doubly excited atomic states

Nicolaides, CA; Mercouris, T; Komninos, Y

dc.contributor.author	Nicolaides, CA	en
dc.contributor.author	Mercouris, T	en
dc.contributor.author	Komninos, Y	en
dc.date.accessioned	2014-03-01T01:17:34Z
dc.date.available	2014-03-01T01:17:34Z
dc.date.issued	2002	en
dc.identifier.issn	0953-4075	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14565
dc.subject.classification	Optics	en
dc.subject.classification	Physics, Atomic, Molecular & Chemical	en
dc.subject.other	Electron energy levels	en
dc.subject.other	Electron transitions	en
dc.subject.other	Electronic structure	en
dc.subject.other	Hamiltonians	en
dc.subject.other	Helium	en
dc.subject.other	Laser pulses	en
dc.subject.other	Probability	en
dc.subject.other	Probes	en
dc.subject.other	Wave equations	en
dc.subject.other	Attosecond pulses	en
dc.subject.other	Electron correlations	en
dc.subject.other	Schrodinger equation	en
dc.subject.other	Atomic physics	en
dc.title	Attosecond dynamics of electron correlation in doubly excited atomic states	en
heal.type	journalArticle	en
heal.identifier.primary	10.1088/0953-4075/35/12/105	en
heal.identifier.secondary	http://dx.doi.org/10.1088/0953-4075/35/12/105	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	We have solved the time-dependent Schrodinger equation describing the simultaneous interaction of the He 1s2s S-1 state with two laser-generated pulses of trapezoidal or Gaussian shape, of duration 86 fs and of frequencies omega(1) = 1.453 au and omega(2) = 1.781 au. The system is excited to the energy region of two strongly correlated doubly excited states, chosen for this study according to specific criteria. It is demonstrated quantitatively that, provided one focuses on the dynamics occurring within the attosecond timescale, the corresponding orbital configurations, 2s2p and 2p3d P-1(o), exist as nonstationary states, with occupation probabilities that are oscillating as the states decay exponentially into the 1sepsilonp continuum, during and after the laser-atom interaction. It follows that it is feasible to probe by attosecond pulses the motion of configurations of electrons as they correlate via the total Hamiltonian. For the particular system studied here, the probe pulses could register the oscillating doubly excited configurations by de-exciting to the He 1s3d D-1 state, which emits at 6680 Angstrom.	en
heal.publisher	IOP PUBLISHING LTD	en
heal.journalName	Journal of Physics B: Atomic, Molecular and Optical Physics	en
dc.identifier.doi	10.1088/0953-4075/35/12/105	en
dc.identifier.isi	ISI:000177016200005	en
dc.identifier.volume	35	en
dc.identifier.issue	12	en
dc.identifier.spage	L271	en
dc.identifier.epage	L279	en