Separation of Recollision Mechanisms in Nonsequential Strong Field Double Ionization of Ar: The Role of Excitation Tunneling
Vector momentum distributions of two electrons created in double ionization of Ar by 25 fs, 0.25PW/cm2 laser pulses at 795 nm have been measured using a “reaction microscope.” At this intensity, where nonsequential ionization dominates, distinct correlation patterns are observed in the two-electron momentum distributions. A kinematical analysis of these spectra within the classical “recollision model” revealed an (e,2e)-like process and excitation with subsequent tunneling of the second electron as two different ionization mechanisms. This allows a qualitative separation of the two mechanisms demonstrating that excitation-tunneling is the dominant contribution to the total double ionization yield.
B. Feuerstein and D. Fischer and A. Dorn and C. D. Schroter and J. Deipenwisch and J. R. Crespo Lopez-Urrutia and C. Hohr and P. B. Neumayer and H. Rottke and C. Trump and M. Wittmann and G. Korn and W. Sandner and R. Moshammer and J. H. Ullrich, "Separation of Recollision Mechanisms in Nonsequential Strong Field Double Ionization of Ar: The Role of Excitation Tunneling," Physical Review Letters, vol. 87, no. 4, pp. 430031-430034, American Physical Society (APS), Jul 2001.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.87.043003
Keywords and Phrases
Argon; Electric Field Effects; Electron Tunneling; Energy Transfer; Laser Pulses; Mathematical Models; Microscopic Examination; Polarization; Spectrum Analysis; Kinematical Analysis; Vector Momentum Distributions; Ionization
International Standard Serial Number (ISSN)
Article - Journal
© 2001 American Physical Society (APS), All rights reserved.