Stabilities of protonated water-ammonia clusters

The Journal of Chemical Physics
A E K SundénK Hansen

Abstract

Branching ratios of water and ammonia evaporation have been measured for spontaneous evaporation from protonated mixed clusters H+(H2O)n(NH3)m in the size range 0 ≤ n ≤ 11 and 0 ≤ m ≤ 7. Mixed clusters evaporate water except for clusters containing six or more ammonia molecules, indicating the formation of a stable core of one ammonium ion surrounded by four ammonia molecules and a second shell consisting predominantly of water. We relate evaporative branching ratios to free energy differences between the products of competing channels and determine the free energy differences for clusters with up to seven ammonia molecules. Clusters containing up to five ammonia molecules show a very strong scaling of these free energy differences.

References

Feb 26, 2005·Chemical Reviews·Michael Meot-Ner
Jun 18, 2009·The Journal of Chemical Physics·A E K SundénK Hansen
Jun 24, 2010·The Journal of Physical Chemistry. a·Preben HvelplundEinar Uggerud
Feb 23, 2013·Science·Markku KulmalaDouglas R Worsnop
Dec 17, 2015·The Journal of Chemical Physics·Piero FerrariKlavs Hansen
Nov 3, 2016·Science·Eimear M DunneKenneth S Carslaw
Jul 22, 2017·The Journal of Physical Chemistry. a·Jonas ElmHanna Vehkamäki
Oct 12, 2017·The Journal of Physical Chemistry. a·Jonas Elm

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