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

TL;DR

This study investigates the stability and structure of Fe(O2)n+ clusters using two techniques, including a novel crossed molecular beam method, to measure fragmentation cross sections and compare results with theoretical models.

Contribution

Introduces a new crossed molecular beam technique for measuring fragmentation cross sections of Fe(O2)n+ clusters, improving efficiency over traditional methods.

Findings

Cross sections agree with geometrical models

Trends consistent with other Fe-molecule clusters

New method reduces need for mass selection

Abstract

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.