Dissociative recombination of H+(H2O)3 and D+(D2O)3 water cluster ions with electrons: Cross sections and branching ratios
Artikel i vetenskaplig tidskrift, 2007

Dissociative recombination (DR) of the water cluster ions H+(H2O)3 and D+(D2O)3 with electrons has been studied at the heavy-ion storage ring CRYRING (Manne Siegbahn Laboratory, Stockholm University). For the first time, absolute DR cross sections have been measured for H+(H2O)3 in the energy range of 0.001–0.8 eV, and relative cross sections have been measured for D+(D2O)3 in the energy range of 0.001–1.0 eV. The DR cross sections for H+(H2O)3 are larger than previously observed for H+(H2O)n (n=1,2), which is in agreement with the previously observed trend indicating that the DR rate coefficient increases with size of the water cluster ion. Branching ratios have been determined for the dominating product channels. Dissociative recombination of H+(H2O)3 mainly results in the formation of 3H2O+H (probability of 0.95±0.05) and with a possible minor channel resulting in 2H2O+OH+H2 (0.05±0.05). The dominating channels for DR of D+(D2O)3 are 3D2O+D (0.88±0.03) and 2D2O+OD+D2 (0.09±0.02). The branching ratios are comparable to earlier DR results for H+(H2O)2 and D+(D2O)2, which gave 2X2O+X (X=H,D) with a probability of over 0.9.

Författare

Jenny Öjekull

Göteborgs universitet

Patrik U Andersson

Göteborgs universitet

Mats B Någård

Göteborgs universitet

Jan B. C. Pettersson

Göteborgs universitet

Nikola Markovic

Chalmers, Kemi- och bioteknik, Fysikalisk kemi

A M Derkatch

Stockholms universitet

A Neau

Stockholms universitet

A al-Khalili

Stockholms universitet

S Rosén

Stockholms universitet

M Larsson

Stockholms universitet

J Semaniak

Akademia Swietokrzyska im. Jana Kochanowskiego w Kielcach

H Danared

Manne Siegbahn Laboratory

A Källberg

Manne Siegbahn Laboratory

F Österdahl

Manne Siegbahn Laboratory

M af Ugglas

Manne Siegbahn Laboratory

Journal of Chemical Physics

0021-9606 (ISSN) 1089-7690 (eISSN)

Vol. 127 194301- 194309

Ämneskategorier

Fysikalisk kemi

DOI

10.1063/1.2803901