Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.193201
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Funding
- Slovenian Research Agency [P1-0112]
- European Community's Seventh Framework Programme [312284]
- CNRS through the PEPS SASELEX
- University of Hamburg [SFB 925]
- Swedish Research Council (VR)
- Italian Slovenian Crossborder Cooperation Programme (CITIUS project)
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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) S-1(e) and (0,1)(0) D-1(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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