Phys. Rev. Lett. 59, 1092–1095 (1987)Above-threshold ionization with subpicosecond laser pulsesReceived 23 June 1987; published in the issue dated 31 August 1987 Above-threshold ionization (ATI) is investigated in xenon with pulses of light at 616 nm ranging from 15 to 0.4 psec. Significant energy shifts and broadenings of the ATI peaks are observed. For pulse widths less than 1 psec, the individual ATI peaks break up into a narrow fine structure, apparently due to resonance enhancements in the ionization process produced by ponderomotive shifts of states. © 1987 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.59.1092
DOI:
10.1103/PhysRevLett.59.1092
PACS:
32.80.Rm
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