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Asymmetric electron emission patterns in H<sub>2</sub> &amp; D<sub>2 </sub>after VUV + NIR photoabsorption

ORAL

Abstract

Using the COLTRIMS technique, we investigated the dissociation of vibrationally excited H2 and D2 molecules after 2-color (VUV + NIR) absorption. The Advanced Light Source synchrotron provided VUV radiation to photoionize H2 (D2), leaving H2+ (D2+) ions in specific vibrational states. A synchronized 1030-nm NIR 12 ps laser pulse then dissociated these ions at a controlled time delay. We report on electron emission in the molecular frame, retrieved from the recoil ion lab-frame momentum, and its dependance on the orientation of the VUV and NIR polarizations. For some vibrational states, we observed an asymmetric photoelectron angular distribution that depends on the VUV/IR time delay. This asymmetry could be related to photoelectron retroaction with the dissociating ion.

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Presenters

  • Spenser J Burrows

    Auburn University

Authors

  • Spenser J Burrows

    Auburn University

  • Itzik Ben-Itzhak

    Kansas State University, J.R. Macdonald Laboratory, Physics, Kansas State University, J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506 USA

  • Benjamin Berry

    Kansas State University

  • Elio G Champenois

    University of California, Berkeley

  • Reinhard Doerner

    Goethe University Frankfurt

  • Jan Dvorak

    Lawrence Berkeley National Laboratory

  • Averell S Gatton

    Auburn University

  • Wael Iskander

    Lawrence Berkeley National Laboratory

  • Kirk A Larsen

    University of California, Berkeley

  • Guillaume M Laurent

    Auburn University

  • Robert R Lucchese

    Lawrence Berkeley National Laboratory, LBL, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA

  • William McCurdy

    University of California, Davis, U. C. Davis and Lawrence Berkeley National Laboratory

  • Daniel Metz

    Goethe University Frankfurt

  • Thomas N Rescigno

    Lawrence Berkeley National Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA

  • Hendrik Sann

    Goethe University Frankfurt

  • Travis Severt

    Kansas State University, J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506 USA

  • Niranjan Shivaram

    Purdue University

  • Daniel S Slaughter

    Lawrence Berkeley National Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA

  • Miriam Weller

    Goethe University Frankfurt

  • Joshua B Williams

    University of Nevada, Reno, Department of Physics, University of Nevada, Reno, NV 89557 USA

  • Thorsten Weber

    Lawrence Berkeley National Laboratory