Acceleration of neutral silicon cluster isomers in a helium gas expansion

The acceleration of isolated neutral silicon cluster isomers in a helium gas expansion has been studied within a molecular beam experiment. The molecular beam flows through a nozzle tube that can be heated, expands into vacuum and the velocity slip of the clusters against the helium is investigated...

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Bibliographic Details
Published in:Chemical physics letters 2001-05, Vol.339 (5), p.323-330
Main Authors: Rosemeyer, Michael, Schäfer, Rolf, August Becker, Jörg
Format: Article
Language:English
Subjects:
Atomic and molecular clusters
Atomic and molecular physics
Diffusion and dynamics of clusters
Exact sciences and technology
Physics
Studies of special atoms, molecules and their ions
clusters
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Summary:The acceleration of isolated neutral silicon cluster isomers in a helium gas expansion has been studied within a molecular beam experiment. The molecular beam flows through a nozzle tube that can be heated, expands into vacuum and the velocity slip of the clusters against the helium is investigated by a time-of-flight method. The measured mean cluster velocities can be analyzed by use of a simple acceleration model and give evidence for two structural classes of cluster isomers. Temperature depending investigations indicate that the cluster isomer class with an enhanced collision cross-section is metastable and transforms into the stable one if the nozzle tube is heated.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(01)00346-3