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We investigate both theoretically and experimentally the momentum distribution of multiply charged ions ionized by an intense multicycle laser field with a maximum intensity of ̃(50-70) 0.3em PW/. Ions with different charge states are produced during a single laser shot due to a spatial variation of the laser intensity within the beam focus. The measurements show approximately a simple linear relation between the width of the momentum distributions and the ionization potential of the ions. Such a power law scaling appears to be universal for various rare gas atoms used (He, Ne, Ar). We analyze this ionization dynamics using a quasiclassical tunneling theory for a single active electron model assuming that the interaction between electrons is negligible in such a strong field limit. We show that for the relatively long pulses used in the present work (̃ 200 0.3em fs or ̃ 80 0.3em cycles) the effect of the laser envelope plays an important role in the ionization process. © 2007 The American Physical Society

physical review a

Momentum distribution of multiply charged ions produced by intense<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mn>50</mml:mn><mml:mo>–</mml:mo><mml:mn>70</mml:mn><mml:mtext>‐</mml:mtext><mml:mi>PW</mml:mi><mml:mo>∕</mml:mo><mml:msup><mml:mi>cm</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo>)</mml:mo></mml:mrow></mml:math>lasers

Momentum distribution of multiply charged ions produced by intense(50–70‐PW∕cm2)lasers