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Dynamics of solvation-induced structural transitions in mesoscopic binary clusters

Molinero¹, Laria, Kapral

¹Departamento de Quimica Inorganica, Analitica y Quimica Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and INQUIMAE, Pabellon II, (1428) Buenos Aires, Argentina.

Physical Review Letters

|October 4, 2000

Summary

Collision dynamics of potassium ions (K+) with water-ammonia clusters were studied. The ion

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Area of Science:

Physical Chemistry
Chemical Physics
Materials Science

Background:

Investigating ion-solvation dynamics is crucial for understanding chemical reactions in solution.
Mesoscopic clusters offer a unique bridge between gas-phase and bulk liquid properties.

Purpose of the Study:

To investigate the ion solvation dynamics of potassium ions (K+) interacting with water-ammonia aggregates.
To characterize the morphological transformations and evaporative cooling processes post-collision.

Main Methods:

Collision experiments involving K+ ions and mesoscopic water-ammonia clusters.
Analysis of cluster structure changes and evaporative cooling rates.

Main Results:

Observed a morphological transformation from a solid water core/ammonia sheath to a dumbbell-shaped cluster.

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Quantified evaporative cooling by determining size-dependent rate constants for complex clusters.

Conclusions:

The post-collision state is governed by structural rearrangement and evaporative cooling.
Size-dependent rate constants provide insights into the cooling mechanisms of these complex aggregates.