Resonantly enhanced multiphoton ionization under XUV FEL radiation: a case study of the role of harmonics

We provide a detailed quantitative study of the possible role of a small admixture of harmonics on resonant two-photon ionization. The motivation comes from the occasional presence of 2nd and 3rd harmonics in FEL radiation. We obtain the dependence of ionic yields on the intensity of the fundamental...

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Published inJournal of physics. B, Atomic, molecular, and optical physics Vol. 48; no. 24; pp. 244006 - 244012
Main Authors Nikolopoulos, G M, Lambropoulos, P
Format Journal Article
LanguageEnglish
Published IOP Publishing 28.12.2015
Subjects
Admixtures
free-electron lasers
Harmonics
Ionization
multiphoton ionization of atoms
resonantly enhanced atomic ionization
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Summary:We provide a detailed quantitative study of the possible role of a small admixture of harmonics on resonant two-photon ionization. The motivation comes from the occasional presence of 2nd and 3rd harmonics in FEL radiation. We obtain the dependence of ionic yields on the intensity of the fundamental, the percentage of 2nd harmonic and the detuning of the fundamental from resonance. Having examined the cases of one and two intermediate resonances, we arrive at results of general validity and global behaviour, showing that even a small amount of harmonic may seem deceptively innocuous.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/48/24/244006