Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Shakeup excitation during optical tunnel ionization Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1103/PhysRevLett.94.033003Physical Review Letters, 94, 3, 2005-01- Shakeup of a two-electron system is investigated in the strong infrared laser field limit, both theoretically and experimentally. During tunnel ionization the electron shakes up a second electron to an excited bound state. Theoretically, a complete analytical theory of shakeup in intense laser fields is developed. We predict that shakeup produces one excited u D 2 state in 10 5 ionization events. Shakeup is measured experimentally by using the molecular clock provided by the internuclear motion. The number of measured events is found to be in excellent agreement with theory.

No abstract

We present a theoretical treatment for the single and double ionization of molecules in strong laser pulses, including the effect of electron correlations. Applied to a model N2 molecule, our simulations show that double ionization occurs via a direct two-electron mechanism at moderate laser intensities , while a step-by-step sequential ionization process dominates at higher intensity . At intermediate intensity, these two mechanisms have a comparable contribution to the total double-ionization yield. This phenomenon is directly reflected in the spatial distributions of N2+ and N22+ in the focal volume of the laser pulse. In addition we show that at high intensity the singly and doubly charged molecular ions are created in well separated regions of space.