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Effects on observables of the singularity in the multiphoton free-free dipole matrix elements

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dc.contributor.author Mercouris, T en
dc.contributor.author Komninos, Y en
dc.contributor.author Dionissopoulou, S en
dc.contributor.author Nicolaides, CA en
dc.date.accessioned 2014-03-01T11:45:39Z
dc.date.available 2014-03-01T11:45:39Z
dc.date.issued 1996 en
dc.identifier.issn 0953-4075 en
dc.identifier.uri http://hdl.handle.net/123456789/37528
dc.subject.classification Optics en
dc.subject.classification Physics, Atomic, Molecular & Chemical en
dc.subject.other ABOVE-THRESHOLD IONIZATION en
dc.subject.other TIME-DEPENDENT THEORY en
dc.subject.other ATOMIC-HYDROGEN en
dc.subject.other CONTINUUM en
dc.subject.other STATES en
dc.subject.other FIELD en
dc.title Effects on observables of the singularity in the multiphoton free-free dipole matrix elements en
heal.type other en
heal.language English en
heal.publicationDate 1996 en
heal.abstract Analysis and calculations on the H atom based on the state-specific expansion approach (SSEA) to the solution of the time-dependent Schrodinger equation (TDSE), show that observables such as high order above threshold ionization (An) and related photoelectron angular distributions (PADS) are strongly dependent on multiphoton couplings in the continuum. In turn, the magnitude of these couplings depend crucially on the on-energy shell singularity of the free-free dipole matrix elements resulting from the asymptotic boundary condition of the energy-normalized scattering functions. Although it is unclear to what extent spatial grid methods account for this singularity accurately, it is certain that expansion methods using some type of box-normalized (finite-range) basis sets cannot handle it, thereby becoming intrinsically inadequate, especially as the field strength increases. This conclusion is supported by our numerical results. en
heal.publisher IOP PUBLISHING LTD en
heal.journalName JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS en
dc.identifier.isi ISI:A1996TQ68700003 en
dc.identifier.volume 29 en
dc.identifier.issue 1 en
dc.identifier.spage L13 en
dc.identifier.epage L19 en


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