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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