Gas phase infrared spectroscopy of cluster anions as a function of size: The 
effect of solvation on hydrogen-bonding in Br−⋅(HBr)1,2,3 clusters

Pivonka, Nicholas L.; Kaposta, Cristina; von Helden, Gert; Meijer, Gerard; Wöste, Ludger; Neumark, Daniel M.; Asmis, Knut R.

doi:10.1063/1.1506308

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Gas phase infrared spectroscopy of cluster anions as a function of size: The effect of solvation on hydrogen-bonding in Br⁻⋅(HBr)_1,2,3 clusters

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Pivonka, N. L., Kaposta, C., von Helden, G., Meijer, G., Wöste, L., Neumark, D. M., et al. (2002). Gas phase infrared spectroscopy of cluster anions as a function of size: The effect of solvation on hydrogen-bonding in Br⁻⋅(HBr)_1,2,3 clusters. The Journal of Chemical Physics, 117(14), 6493-6499. doi:10.1063/1.1506308.

Cite as: https://hdl.handle.net/21.11116/0000-000B-4681-4

Abstract

The gas phase vibrational spectroscopy of Br⁻⋅(HBr)_1,2,3 clusters has been studied between 6 and 16 μm (625 and 1700 cm⁻¹) by multiphoton infrared photodissociation spectroscopy using the output of the free electron laser for infrared experiments. Infrared (IR) spectra were recorded by monitoring the mass-selected ion yield. In all three systems neutral HBr loss is found to be the dominant photofragmentation channel. BrHBr⁻ exhibits a weak absorption band at 1558 cm⁻¹ which is assigned to the overtone of the antisymmetric stretching mode ν3. A series of strong absorption bands was observed for Br⁻⋅(HBr)₂ at energies in the 950–1450 cm⁻¹ range. The Br⁻⋅(HBr)₃ spectra reveal two absorption bands at 884 and 979 cm⁻¹, which are assigned to two H-atom stretching modes. Evidence for the localization of the H atom and destruction of the symmetric BrHBr⁻ hydrogen bond in the larger clusters is presented. Standard electronic structure calculations fail to reproduce the experimental IR spectra, indicating a breakdown of the harmonic approximation.