Physics – Atomic Physics
Scientific paper
2010-07-08
Phys. Rev. Lett. 105, 203902 (2010)
Physics
Atomic Physics
5 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.105.203902
High-order harmonic generation (HHG) is investigated theoretically in the over-the-barrier ionization (OBI) regime revealing the strong signature of interference between two separately ionized and separately propagating free wave packets of a single electron. The interference leads to the emission of coherent light at a photon energy corresponding to the kinetic-energy difference of the two recolliding electron quantum paths, thus complementary to the well-known classical three-step picture of HHG. As will be shown by time-frequency analysis of the emitted radiation, the process entirely dominates the coherent HHG emission after the atomic ground state has been depleted by a strong field. Moreover, it can be isolated from the continuum--bound harmonics via phase-matching.
Heck Robert
Keitel Christoph H.
Kohler Markus C.
Ott Christian
Pfeifer Thomas
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