Protonated water clusters in TPC's


Kaya Y., Kalkan Y., Veenhof R.

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, vol.824, pp.535-537, 2016 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 824
  • Publication Date: 2016
  • Doi Number: 10.1016/j.nima.2015.11.072
  • Journal Name: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.535-537

Abstract

Water vapour is added to the ALICE TPC gas to enhance its stability. These polar molecules create large protonated water clusters around a H+ core. In this context, the reactions H3O+ (H2O)(n-1) + H2O -> H-3 O+(H2O)(n) (n=1-9) were studied in the gas phase. Structures for these clusters are suggested and the most stable structures for each cluster size are shown. The thermodynamic parameters Delta H-n-1,n(0), Delta G(n-1,n)(0), Delta S-n-1,n(0) and equilibrium constants K-n-1,K-n for the reaction were calculated to determine the size of the water clusters. The results are close to experimental data found in the literature. Protonated water clusters at stp have a size of 6-9 which corresponds to a mass of 127.1-181.2 g/mole. (C) 2015 Elsevier B.V. All rights reserved.