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Dissociation dynamics of the water dication following one-photon double ionization. II. Experiment

  • Author(s): Reedy, D
  • Williams, JB
  • Gaire, B
  • Gatton, A
  • Weller, M
  • Menssen, A
  • Bauer, T
  • Henrichs, K
  • Burzynski, Ph
  • Berry, B
  • Streeter, ZL
  • Sartor, J
  • Ben-Itzhak, I
  • Jahnke, T
  • Dörner, R
  • Weber, Th
  • Landers, AL
  • et al.
Abstract

© 2018 American Physical Society. We demonstrate the use of cold target recoil ion momentum spectroscopy to perform state-selective measurements of the dissociative channels following single-photon double-ionization of H2O. The two dominant dissociation channels observed lead to two-body (OH++H++2e-) and three-body (2H++O+2e-) ionic fragmentation channels. In the two-body case we observe the presence of an autoionization process with a double-differential cross section that is similar to the single-photon double-ionization of helium well above threshold. In the three-body case, momentum and energy correlation maps in conjunction with new classical trajectory calculations in the companion theory paper by Z. L. Streeter et al. [Phys. Rev. A 98, 053429 (2018)10.1103/PhysRevA.98.053429] lead to the determination of the eight populated dication states and their associated fragmentation geometry. For the latter case, state-specific relative cross sections, median kinetic energy releases, and median angles between asymptotic proton momenta are presented. This benchmark-level experiment demonstrates that, in principle, state-selective fixed-frame triple-differential cross sections can be measured for some dication states of the water molecule.

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