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Phys. Rev. A 76, 067401 (2007) [3 pages]Comment on “Detailed instantaneous ionization rate of H2+ in an intense laser field”
Received 15 March 2007; published 11 December 2007
The quantity “component instantaneous ionization rate” introduced by M. Vafaee et al. [Phys. Rev. A 74, 043416 (2006)] for the analysis of ionization of H2+ in intense laser pulses is discussed. It is shown that the meaning of this quantity as defined in that work is dubious, since there exists a lower time limit below which a quantum mechanical transition does not scale linearly in time and thus does not fulfill the requirements of a rate. Therefore, in a laser field it is impossible to define a rate with subcycle resolution. The analysis of a characteristic photoelectron spectrum reveals also that the “instantaneous rate” that is shown to be the electron flux through some boundary cannot be related to ionization without a deconvolution procedure. Finally, the “negative ionization” is identified as caused by the well-known quiver motion in strong laser fields. ©2007 The American Physical Society
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