Berlin 2001 – wissenschaftliches Programm

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MS: Massenspektrometrie

MS 6: Clusters, Molecules, Laser Desorption and MALDI

MS 6.1: Vortrag

Donnerstag, 5. April 2001, 16:15–16:30, EB 202

Blackbody Fragmentation of Cationic Ammonia Clusters — •Brigitte Fox, Björn Reinhard, Martin Beyer, and Vladimir Bondybey — Institut für Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstr. 4, 85747 Garching

The first systematic study of the blackbody radiation induced fragmentation of size-selected ionic ammonia clusters was carried out and compared with that of the corresponding hydrates. Specifically, the Ag⁺ and H⁺ cation clusters were studied, with the fragmentation rate constants of the ions solvated with ammonia being found to exhibit the same overall linear dependence on the number of ligands n, which was previously observed for the corresponding hydrates as well as for a number of other hydrated ions. To facilitate the interpretation of the experimental observations, complementary DFT calculations of the cluster structures and of their harmonic frequencies and intensities were carried out. The observed fragmentation rates exhibit a satisfactory qualitative agreement with the computed rates of energy absorption from the blackbody infrared radiation background.