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dc.contributor.authorAlnaser, AS
dc.contributor.authorMaharjan, CM
dc.contributor.authorWang, P
dc.contributor.authorLitvinyuk, IV
dc.date.accessioned2017-05-03T11:43:19Z
dc.date.available2017-05-03T11:43:19Z
dc.date.issued2006
dc.date.modified2010-07-30T07:19:48Z
dc.identifier.issn0953-4075
dc.identifier.urihttp://hdl.handle.net/10072/33070
dc.description.abstractWe studied ionization of neon and argon by intense linearly polarized femtosecond laser pulses of different wavelengths (400 nm and 800 nm) and peak intensities, and by measuring momentum distributions of singly charged positive ions in the direction parallel to laser polarization. For Ne the momentum distributions exhibited a characteristic dip at zero momentum at 800 nm and a complex multipeak structure at 400 nm. Similarly, for Ar the momentum distributions evolved from a complex multipeak structure with a pronounced dip in the centre at 400 nm, to a smooth distribution characteristic of pure tunneling ionization (800 nm, high intensities). In the intermediate regime (800 nm, medium to low intensities), for both atoms we observed recoil ion momentum distributions modulated by quasi-periodic structures usually seen in the photoelectron energy spectra in a multi-photon regime (ATI spectra). Ne did show a characteristic 'dip' at low momentum, while the longitudinal momentum distribution for Ar exhibited a spike at zero momentum instead. The spectra did dramatically change at 400 nm, where both ions show the pronounced dip near zero momentum. Based on our results, we conclude that the structures observed in Ne and Ar momentum distributions reflect the specifics of atomic structure of the two targets and should not be attributed to effects of electron recollision, as was suggested earlier. Instead, as our results indicate, they are due to the effects of multi-photon resonant enhancement of strong-field ionization.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoen_AU
dc.publisherInstitute of Physics Publishing
dc.publisher.placeUnited Kingdom
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefromL323
dc.relation.ispartofpagetoL328
dc.relation.ispartofjournalJournal of Physics B: Atomic, Molecular and Optical Physics
dc.relation.ispartofvolume39
dc.rights.retentionY
dc.subject.fieldofresearchNonlinear Optics and Spectroscopy
dc.subject.fieldofresearchQuantum Optics
dc.subject.fieldofresearchAtomic and Molecular Physics
dc.subject.fieldofresearchAtomic, Molecular, Nuclear, Particle and Plasma Physics
dc.subject.fieldofresearchOptical Physics
dc.subject.fieldofresearchTheoretical and Computational Chemistry
dc.subject.fieldofresearchcode020503
dc.subject.fieldofresearchcode020604
dc.subject.fieldofresearchcode020201
dc.subject.fieldofresearchcode0202
dc.subject.fieldofresearchcode0205
dc.subject.fieldofresearchcode0307
dc.titleMulti-photon resonant effects in strong-field ionization: origin of the dip in experimental longitudinal momentum distributions
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.date.issued2006
gro.hasfulltextNo Full Text
gro.griffith.authorLitvinyuk, Igor


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