Signatures of tunneling and multiphoton ionization in the electron-momentum distributions of atoms by intense few-cycle laser pulses

Journal Article · Sun Oct 15 00:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.041402· OSTI ID:20857802

Wickenhauser, M ^[1]; Tong, X M ^[1]; Arbo, D G; Burgdoerfer, J ^[2]; Lin, C D ^[1]

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1. J. R. Macdonald Laboratory, Physics Department, Kansas State University, Manhattan, Kansas 66506-2604 (United States)
2. Institute for Theoretical Physics, Vienna University of Technology, A-1040 Vienna (Austria)

Electron-momentum distributions for above-threshold ionization of argon in a few-cycle, linearly polarized laser pulse are investigated. Spectral features characteristic of multiphoton as well as tunneling ionization coexist over a range of the Keldysh parameter {gamma} in the transition regime {gamma}{approx}1. Surprisingly, the simple strong-field approximation (SFA) is capable of reproducing the key features of the two-dimensional momentum distributions found in the full solution of the time-dependent Schroedinger equation, despite the fact that SFA is known to severely underestimate the total ionization probability.

• OSTI ID: 20857802
• Journal Information: Physical Review. A, Vol. 74, Issue 4; Other Information: DOI: 10.1103/PhysRevA.74.041402; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
APPROXIMATIONS
ARGON
ATOMS
DISTRIBUTION
ELECTRONS
LASER RADIATION
MATHEMATICAL SOLUTIONS
MULTI-PHOTON PROCESSES
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
PROBABILITY
PULSES
SCHROEDINGER EQUATION
TIME DEPENDENCE
TUNNEL EFFECT
TWO-DIMENSIONAL CALCULATIONS