Sudden ionization – fragmentation
H+ + OH
H+ + OH
  67 %
OH+ + H
  Mostly H2O+
  Dissociation to  OH+ + H
   is energetically favored
   over  H+ + OH
OH+ + H
Pair PECs from:
Chen PhD 1991
Kołos et al., J. Chem. Phys. 84, 3278 (1986)
Werner et al., J. Chem. Phys. 79, 905 (1983)
H-O-H angle at 104.5°