Journal
PHYSICAL REVIEW A
Volume 98, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.98.053430
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Funding
- University of Nevada, Reno
- National Science Foundation [NSF-PHY-1807017]
- U.S. Department of Energy (DOE) [DEAC02-05CH11231]
- National Energy Research Computing Center (NERSC)
- ALS, U.S. DOE, Office of Basic Energy Sciences, Division of Chemical Sciences
- ALS via the Doctoral Fellowship in Residence
- DAAD
- BMBF
- RoentDek Company
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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)] 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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