Controllable surfaces of path interference in the multiphoton ionization of atoms by a weak trichromatic field

Mercouris, T; Nicolaides, CA

dc.contributor.author	Mercouris, T	en
dc.contributor.author	Nicolaides, CA	en
dc.date.accessioned	2014-03-01T11:44:39Z
dc.date.available	2014-03-01T11:44:39Z
dc.date.issued	2005	en
dc.identifier.issn	1464-4266	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/37066
dc.subject	Ab initio calculations	en
dc.subject	Coherent control	en
dc.subject	Multiphoton ionization	en
dc.subject	Photoionization	en
dc.subject.classification	Optics	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	Correlation methods	en
dc.subject.other	Eigenvalues and eigenfunctions	en
dc.subject.other	Harmonic analysis	en
dc.subject.other	Photons	en
dc.subject.other	Proton irradiation	en
dc.subject.other	Ab initio calculations	en
dc.subject.other	Coherent control	en
dc.subject.other	Many-electron, many-photon theory	en
dc.subject.other	Multiphoton ionization	en
dc.subject.other	Photoionization	en
dc.title	Controllable surfaces of path interference in the multiphoton ionization of atoms by a weak trichromatic field	en
heal.type	other	en
heal.identifier.primary	10.1088/1464-4266/7/10/029	en
heal.identifier.secondary	http://dx.doi.org/10.1088/1464-4266/7/10/029	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	Multiphoton detachment rates for the H-1S ground state irradiated by a weak trichromatic ac field consisting of the fundamental frequency ω ≤ 0.272 eV and its second, third or fourth higher harmonics were computed from first principles. The weak intensities are in the range of 107-108 W cm-2. The calculations incorporated systematically electronic structure and electron correlation effects. They were done by implementing a time-independent, nonperturbative many-electron, many-photon theory (MEMPT) which obtains cycle-averaged complex eigenvalues, whose real part gives the field-induced energy shift, Δ, and the imaginary part is the multiphoton ionization rate, Γ. Through analysis, plausible arguments and computation, we show that when the intensities are weak the dependence of Γ on phase differences is simple. Specifically, Γs are depicted in the form of plane surfaces, with minor ripples due to higher order ionization paths, in terms of trigonometric functions of the phase differences. This dependence is likely to be applicable to other atomic systems as well, and to provide a definition of the weak field regime in the trichromatic case. When the field intensities are such that higher order ionization paths become important, these dependences break down and we reach the strong field regime. © 2005 IOP Publishing Ltd.	en
heal.publisher	IOP PUBLISHING LTD	en
heal.journalName	Journal of Optics B: Quantum and Semiclassical Optics	en
dc.identifier.doi	10.1088/1464-4266/7/10/029	en
dc.identifier.isi	ISI:000233439100030	en
dc.identifier.volume	7	en
dc.identifier.issue	10	en
dc.identifier.spage	S403	en
dc.identifier.epage	S407	en