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Journal Article

Laser control over the ultrafast Coulomb explosion of N22+ after Auger decay: A quantum-dynamics investigation


Hanna,  Athiya M.
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, DESY, Notkestraße 85, D-22607 Hamburg, Germany;
Department of Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany;

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Hanna, A. M., Vendrell, O., Ourmazd, A., & Santra, R. (2017). Laser control over the ultrafast Coulomb explosion of N22+ after Auger decay: A quantum-dynamics investigation. Physical Review A, 95(4): 043419. doi:10.1103/PhysRevA.95.043419.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-3B2D-8
By theoretical calculation, we demonstrate the possibility to control and partially suppress the Coulomb explosion of N2 molecules after core-level photoionization by an x-ray laser and subsequent Auger decay. This is achieved by means of a femtosecond infrared laser pulse interacting with the N22+ dication produced by the x-ray pulse. Suppression of molecular fragmentation requires few-femtosecond IR pulses interacting with the system either during or shortly after the arrival of the x-ray pulse. The IR pulse suppresses fragmentation mostly by optically coupling the electronic routes to ultrafast molecular dissociation with electronic channels able to support long-lived vibrational resonances. The effect is strongly dependent on the orientation of the molecule with respect to the polarization axis of the IR field. Our calculations are motivated by x-ray pump–IR probe experiments performed at an x-ray free-electron laser [J. M. Glownia et al., Opt. Express 18, 17620 (2010)], where only enhancement of N22+ fragmentation as a function of the pump-probe delay time was reported. The opposite effect reported here becomes apparent when the various electronic channels are considered separately. In practice, this corresponds to a coincident measurement of the energy of the ejected Auger electron.