Stabilities of protonated water-ammonia clusters
Journal article, 2018

Branching ratios of water and ammonia evaporation have been measured for spontaneous evaporation from protonated mixed clusters H + (H 2 O) n (NH 3 ) 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.


Erika Sundén

University of Gothenburg

K Stöchkel

Aarhus University

P. Hvelplund

Aarhus University

S. Brøndsted Nielsen

Aarhus University

Bertil Dynefors

Chalmers, Physics

Klavs Hansen

University of Gothenburg

Tianjin University

Journal of Chemical Physics

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

Vol. 148 18 184306

Subject Categories

Inorganic Chemistry

Physical Chemistry

Theoretical Chemistry



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