To better understand the propensity for the three-body breakup in dissociative recombination (DR) of dihydrides (H3+, NH2+, CH2+, and H2O+), we undertook a study of the dynamics of this process. A study of DR of H2O+ to give O + H + H was carried out at the CRYRING Heavy-Ion Storage Ring in Stockholm. With the stored beam energy of 4.5 MeV, we separated the O signal from the H signals with a differential absorber, thus reducing the problem to a sum of two two-body problems. Results included (1) the ratio of O(3P) to O(1D) product, (2) the distribution of recoil-kinetic energy between the two hydrogen atoms, (3) the angular distribution between the hydrogen atoms in the O(3P) channel and in the O(1D) channel.

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Journal Phys. Rev. Lett.
Datz, S, Thomas, R. D, Rosén, S, Larsson, M, Derkatch, A. M, Hellberg, F, & van der Zande, W. J. (2000). Dynamics of three-body breakup in dissociative recombination: H2O+. Phys.Rev.Lett., 85, 5555–5558.