DC FieldValueLanguage
dc.contributor.advisorDirschmid, Hans Jörg-
dc.contributor.authorZanghellini, Jürgen-
dc.date.accessioned2020-06-30T01:12:24Z-
dc.date.issued2004-
dc.identifier.urihttps://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-9487-
dc.identifier.urihttp://hdl.handle.net/20.500.12708/9578-
dc.description.abstractShake-up of a two-electron system is investigated in the strong infrared laser field limit, both theoretically and experimentally. During tunnel ionization the electron shakes-up a second electron to an excited bound state. Theoretically, a complete analytical theory of shake-up in intense laser fields is developed. Shake-up is measured experimentally by using the molecular clock provided by the internuclear motion. The number of measured events is found to be in excellent agreement with theory.<br />Besides shake-up there are a wealth of multi-electron phenomena in strong laser fields. We introduce the multi-configuration time-dependent Hartree-Fock (MCTDHF) method as a new approach towards the numerical solution of the time-dependent Schrödinger equation arising in ultrafast laser dynamics. MCTDHF approximates the exact wave function by several Slater determinants. By doing so the method produces a lower dimensional, non-linear system of coupled differential equations compared to the original Schrödinger equation.<br />To assess the reliability and efficiency of MCTDHF we test the method on two examples. We find rapid convergence for several quantities towards the exact results. The method converges, where time-dependent Hartree-Fock fails qualitatively.<br />By using one dimensional MCTDHF calculations we then investigate ionization of multi-electron systems. The laser induced multi-electron dynamics depend on the ratio of laser frequency to plasmon frequency discriminating two different regimes. In the over-resonant limit tunnel ionization is destroyed. Ionization takes place by a classical over the barrier mechanism. In the under-resonant limit tunnel ionization remains dominant, but is weakened by a polarization induced growth of the tunneling barrier.<br />de
dc.formatIV, 44 Bl.-
dc.languageEnglish-
dc.language.isoen-
dc.subjectHeliumähnliches Systemde
dc.subjectIonisationde
dc.subjectInfrarotlaserde
dc.subjectDynamisches Verhaltende
dc.titleMulti-electron dynamics in the ionization of molecules by strong laser pulsesen
dc.typeThesisen
dc.typeHochschulschriftde
dc.contributor.assistantScrinzi, Armin-
tuw.publication.orgunitE387 - Institut für Photonik-
dc.type.qualificationlevelDoctoral-
dc.identifier.libraryidAC04378169-
dc.description.numberOfPages44-
dc.identifier.urnurn:nbn:at:at-ubtuw:1-9487-
dc.thesistypeDissertationde
dc.thesistypeDissertationen
item.fulltextwith Fulltext-
item.openairetypeThesis-
item.openairetypeHochschulschrift-
item.cerifentitytypePublications-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
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