2 research outputs found
PYRIDINE AGGREGATION IN HELIUM NANODROPLETS
No full textAuthor Institution: Department of Physical Chemistry II, Ruhr-Universitat Bochum, GermanyPyridine crystals show the unusual property of isotopic polymorphism. Experimentally it has been observed that deuterated pyridine crystals exist in two phases while pyridine does not show a phase transition, Angew. Chem. Int. Ed., 48, 755 (2009).}. Therefore, although isotopic substitution is the smallest possible modification of a molecule it greatly affects the stability of pyridine crystals. A possible experimental approach in order to understand this striking effect might be the study of pyridine aggregation for small clusters. By embedding the clusters in helium nanodroplets the aggregates can be stabilized and studied by means of Infrared Depletion Spectroscopy. Pyridine small clusters were identified in the C-H asymmetric vibration region (3000-3200 cm) using this method
IR SPECTROSCOPY STUDY ON THE (HCl)(HO) AGGREGATION IN HELIUM NANODROPLETS
No full textAuthor Institution: Department of Physical Chemistry II, Ruhr-Universitat Bochum, GermanyThe study of acid-water clusters is an active area of research due to its fundamental importance for chemistry, Int. Rev. Phys. Chem. 21, 277 (2002).}. In particular the (HCl)(HO) clusters have been extensively investigated both theoretically and experimentally as a benchmark system. Despite of the great effort devoted to its understanding HCl dissociation in water clusters is still not well understood. An IR-Spectroscopy study on (HCl)(HO) embedded in helium nanodroplets will be presented. The HOHO and isotopic substitution was used in the experiments to probe the bands in the 2650-2760 cm spectral range which has been object of some debate recently, Science 324, 1545 (2009).}, Phys. Chem. Lett. 1, 2233 (2010).}. The observed isotopic shifts for the different bands raise some new questions to be addressed
