Photoelectron And Fragmentation Dynamics Of The H++ H+ ...

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Photoelectron and fragmentation dynamics of the H++H+ dissociative channel in NH3 following direct single-photon double ionization

2020
  • Larsen, Kirk A;
  • Rescigno, Thomas N;
  • Severt, Travis;
  • Streeter, Zachary L;
  • Iskandar, Wael;
  • Heck, Saijoscha;
  • Gatton, Averell;
  • Champenois, Elio G;
  • Strom, Richard;
  • Jochim, Bethany;
  • Reedy, Dylan;
  • Call, Demitri;
  • Moshammer, Robert;
  • Dörner, Reinhard;
  • Landers, Allen L;
  • Williams, Joshua B;
  • McCurdy, C William;
  • Lucchese, Robert R;
  • Ben-Itzhak, Itzik;
  • Slaughter, Daniel S;
  • Weber, Thorsten
et al.

Published Web Location

https://doi.org/10.1103/physrevresearch.2.043056...Main ContentMetricsAuthor & Article InfoAbstract

We report measurements on the H++H+ fragmentation channel following direct single-photon double ionization of neutral NH3 at 61.5 eV, where the two photoelectrons and two protons are measured in coincidence using three-dimensional (3D) momentum imaging. We identify four dication electronic states that contribute to H++H+ dissociation, based on our multireference configuration-interaction calculations of the dication potential energy surfaces. The extracted branching ratios between these four dication electronic states are presented. Of the four dication electronic states, three dissociate in a concerted process, while the fourth undergoes a sequential fragmentation mechanism. We find evidence that the neutral NH fragment or intermediate NH+ ion is markedly rovibrationally excited. We also identify differences in the relative emission angle between the two photoelectrons as a function of their energy sharing for the four different dication states, which bare some similarities to previous observations made on atomic targets.

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Article
  • Photoelectron and fragmentation dynamics of the H+ + H+ dissociative channel in NH3 following direct single-photon double ionization
  • Abstract
  • I Introduction
  • II Experiment
  • III Theory
  • IV Results and Discussion
  • V Conclusion
  • VI Acknowledgments
  • References
  • Metrics
  • Author & Article Info
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