Phys. Rev. A 64, 043412 (2001) [4 pages]Reexamination of over-the-barrier and tunneling ionization of the hydrogen atom in an intense fieldReceived 2 May 2001; published 18 September 2001 Ionization of the hydrogen atom in an intense laser field is calculated using the classical-trajectory Monte Carlo method with allowance of tunneling at the classical turning points. With an initial condition of zero angular momentum, excellent agreement with an accurate quantum-mechanical calculation is obtained. The usually mentioned classical threshold for ionization at field strength 0.0625e/a02 is shown to be irrelevant to realistic pulses; the effective classical thresholds for an adiabatically ramped dc pulse are found to be 0.080e/a02 in one dimension and 0.130e/a02 in three dimensions. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.64.043412
DOI:
10.1103/PhysRevA.64.043412
PACS:
32.80.Rm, 02.70.Ns
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