Journal Article

PUBDB-2015-01459

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png High Resolution Multiphoton Spectroscopy by a Tunable Free-Electron-Laser Light

Žitnik, M. (Corresponding Author) ; Mihelič, A. ; Bučar, K. ; Kavčič, M. ; Rubensson, J.-E. ; Svanquist, M. ; Söderström, J. ; Feifel, R. ; Såthe, C. ; Ovcharenko, Y. ; Lyamayev, V. ; Mazza, T.>Extern*XFEL* ; Meyer, M.>Extern*XFEL* ; Simon, M. ; Journel, L. ; Lüning, J. ; Plekan, O. ; Coreno, M. ; Devetta, M. ; Di Fraia, M. ; Finetti, P. ; Richter, R. ; Grazioli, C. ; Prince, K.  C. ; Callegari, C.

2014
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.113.193201

Abstract: 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.

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Contributing Institute(s):

1. European XFEL (Eur.XFEL)

Research Program(s):

1. XFEL In-house research / external facilities (POF2-54G17) (POF2-54G17)

Experiment(s):

1. Measurement at external facility
2. SQS: Small Quantum Systems (SASE3)

Appears in the scientific report 2014

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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