期刊
PHYSICAL REVIEW LETTERS
卷 113, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.193201
关键词
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资金
- 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)
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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