Collision-Induced Dissociation Studies on Fe(O2) n + (n = 1–6) Clusters: Application of a New Technique Based on Crossed Molecular Beams

• Published in: The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Vol. 117; no. 14; pp. 2891 - 2898
• Main Authors: Velegrakis, Michalis, Mihesan, Claudia, Jadraque, Maria
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 11-04-2013
• Subjects: Atomic and molecular clusters; Atomic and molecular physics; Drug Stability; Exact sciences and technology; Ferric Compounds - chemistry; Gases - chemistry; Mass Spectrometry; Physics; Stability and fragmentation of clusters; Studies of special atoms, molecules and their ions; clusters; Crossed beams; Iron oxide; Oxygen Molecules; Molecular clusters; Experimental device; Iron; Diatomic molecules; Nitrogen Atomic ions; Rare gases; Molecular dissociation; Molecular beams; Gas phase; Molecule collisions; Cross sections
• ISSN: 1089-5639; 1520-5215
• DOI: 10.1021/jp310617e

Gas-phase oxygen-rich iron oxide clusters Fe(O2) n + (n = 1–6), are produced in a molecular beam apparatus. Their stability and structure are investigated by measuring the fragmentation cross-sections from collision-induced-dissociation experiments. For this purpose, two different techniques have been employed. The first one relies on the measurement of the fragments resulting after collisional activation and subsequent dissociation of mass selected cluster ions in a molecular beam passing through a cell filled with noble gas atoms. The second one is a new approach that we introduce and is based on crossed molecular beams to measure the fragmentation cross-sections, in a more efficient manner without mass selection of the individual clusters. The cross-sections obtained with the different techniques are compared with each other as well as with theoretical ones resulting from the application of a simple geometrical projection model. Finally, the general trends observed are compared with results for other Fe-molecule clusters available in the literature.