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High resolution multiphoton spectroscopy by a tunable free-electron-laser light
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2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, no 19, 193201- p.Article in journal (Refereed) Published
Abstract [en]

Seeded free electron lasers theoretically have the intensity, tunability, and resolution required for multiphoton spectroscopy of atomic and molecular species. Using the seeded free electron laser FERMI and a novel detection scheme, we have revealed the two-photon excitation spectra of dipole-forbidden doubly excited states in helium. The spectral profiles of the lowest (-1,0)^{+1} ^{1}S^{e} and (0,1)^{0} ^{1}D^{e} resonances display energy shifts in the meV range that depend on the pulse intensity. The results are explained by an effective two-level model based on calculated Rabi frequencies and decay rates.

Place, publisher, year, edition, pages
2014. Vol. 113, no 19, 193201- p.
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Physical Sciences
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URN: urn:nbn:se:uu:diva-237722DOI: 10.1103/PhysRevLett.113.193201ISI: 000345358100006PubMedID: 25415905OAI: oai:DiVA.org:uu-237722DiVA: diva2:768668
Available from: 2014-12-04 Created: 2014-12-04 Last updated: 2017-12-05Bibliographically approved

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Rubensson, Jan-ErikSöderström, JohanFeifel, Raimund

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