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High resolution multiphoton spectroscopy by a tunable free-electron-laser light.

Zitnik, M; Mihelič, A; Bučar, K; Kavčič, M; Rubensson, J-E; Svanquist, M; Söderström, J; Feifel, R; Såthe, Conny LU and Ovcharenko, Y, et al. (2014) In Physical Review Letters 113(19).
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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Contribution to journal
publication status
published
subject
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Physical Review Letters
volume
113
issue
19
publisher
American Physical Society
external identifiers
  • pmid:25415905
  • wos:000345358100006
  • scopus:84910071092
ISSN
1079-7114
DOI
10.1103/PhysRevLett.113.193201
language
English
LU publication?
yes
id
47e43639-bc4d-4d7a-91cf-7c613f9204d4 (old id 4816312)
date added to LUP
2014-12-08 15:21:09
date last changed
2017-09-10 03:19:16
@article{47e43639-bc4d-4d7a-91cf-7c613f9204d4,
  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.},
  articleno    = {193201},
  author       = {Zitnik, M and Mihelič, A and Bučar, K and Kavčič, M and Rubensson, J-E and Svanquist, M and Söderström, J and Feifel, R and Såthe, Conny and Ovcharenko, Y and Lyamayev, V and Mazza, T and Meyer, M and Simon, M and Journel, L and Lüning, J and Plekan, O and Coreno, M and Devetta, M and Di Fraia, M and Finetti, P and Richter, R and Grazioli, C and Prince, K C and Callegari, C},
  issn         = {1079-7114},
  language     = {eng},
  number       = {19},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {High resolution multiphoton spectroscopy by a tunable free-electron-laser light.},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.113.193201},
  volume       = {113},
  year         = {2014},
}