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Dissociative recombination of H+(H2O)3 and D+(D2O)3 water cluster ions with electrons: Cross sections and branching ratios

Jenny Öjekull ; Patrik U Andersson ; Mats B Någård ; Jan B. C. Pettersson ; Nikola Markovic (Institutionen för kemi- och bioteknik, Fysikalisk kemi) ; A M Derkatch ; A Neau ; A Al Khalili ; S Rosén ; M. Larsson ; J Semaniak ; H. Danared ; A Källberg ; F Österdahl ; M af Ugglas
The Journal of chemical physics (0021-9606 ). Vol. 127 (2007), p. 194301- 194309.
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2008-01-07. Senast ändrad 2009-01-07.
CPL Pubid: 64511

 

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Institutioner (Chalmers)

Institutionen för kemi (2001-2011)
Institutionen för kemi- och bioteknik, Fysikalisk kemi (2005-2014)

Ämnesområden

Fysikalisk kemi

Chalmers infrastruktur