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

Mercouris, T; Komninos, Y; Dionissopoulou, S; Nicolaides, CA

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	https://dspace.lib.ntua.gr/xmlui/handle/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