Record Details

Title:
High Resolution Multiphoton Spectroscopy by a Tunable Free-Electron-Laser Light
Affiliation(s):
EuXFEL staff, Other
Author group:
Instrument SQS
Topic:
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.
Imprint:
College Park, Md., APS, 2014
Journal Information:
Phys. Rev. Lett., 113, 19, 193201 (2014)
ISSN:
0031-9007
1079-7114
Related external records:
DOI: 10.1103/PhysRevLett.113.193201
WOS: WOS:000345358100006
Language(s):
English
Record appears in:

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