Recombination of simple molecular ions studied in storage ring: dissociative recombination of H2O+
Dissociative recombination of vibrationally relaxed H2O+ ions with electrons has been studied in the heavy-ion storage ring CRYRING. Absolute cross-sections have been measured for collision energies between 0 eV and 30 eV. The energy dependence of the cross-section below 0.1 eV is found to be much steeper than the E-1 behaviour associated with the dominance of the direct recombination mechanism. Resonant structures found at 4 eV and 11 eV have been attributed to the electron capture to Rydberg states converging to electronically excited ionic states. Complete branching fractions for all dissociation channels have been measured at a collision energy of 0 eV. The dissociation process is dominated by three-body H + H + O breakup that occurs with a branching ratio of 0.71.
Rosen
S
Department of Physics, Stockholm University, Sweden.
Derkatch
A
Semaniak
J
Neau
A
al-Khalili
A
Le Padellec A
Vikor
L
Thomas
R
Danared
H
af Ugglas M
Larsson
M