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.

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.