Separation of Recollision Mechanisms in Nonsequential Strong Field Double Ionization of Ar: The Role of Excitation Tunneling

Journal Article · Mon Jul 23 04:00:00 EDT 2001 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.87.043003· OSTI ID:40277169

Feuerstein, B; Moshammer, R; Fischer, D; Dorn, A; Schroeter, C D; Deipenwisch, J; Crespo Lopez-Urrutia, J R; Hoehr, C; Neumayer, P; Ullrich, J ^[1]

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1. and others

Vector momentum distributions of two electrons created in double ionization of Ar by 25fs, 0.25 PW/cm{sup 2} laser pulses at 795nm 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.

• Sponsoring Organization: (US)
• OSTI ID: 40277169
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 87; ISSN 0031-9007
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRONS
EXCITATION
IONIZATION
LASERS
SPECTRA
TUNNELING
VECTORS