Alkali metal ions are of great biological importance. Investigating their solvation is of great importance to understand their activity and has been in focus of research for many years. Binary M+H2O cluster in the gas phase are good model systems to gain insights into the microscopic solvation mechanisms and ion-water interactions. Characterizing the temperature, or internal energy, of these species is a challenge, both experimentally and theoretically. The temperature depends strongly on the formation process and composition of the cluster ion. Infrared photodissociation spectroscopy using the argon tagging method is a well suited tool. Single argon tagging itself is a well established technique for lowering the temperature and sharpening the spectra, but experiments with multiple attached argon atoms are rare.In the present study the influence of multiple attached argon atoms on cluster temperature, vibrational band origins and rotational constants will be discussed systematically for n=1-3. The rotational structure of the water subunit will be analyzed in detail. Many spectra show an unexpected broadening and splitting of vibrational features accompanied by an unexpected intensity distribution for transitions involving the |K|=1 level. The influence of a low rotational barrier of the water subunit on the spectra will be discussed.

Alkali metal M+H2OArn and M+D2OArn cluster: Effects of multiple argon tagging in IRPD spectroscopy

248th National Meeting (2014)

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