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Photoionization and Photofragmentation of BxNy Clusters Produced by Photoablation of Boron Nitride Followed by Supersonic Expansion Cooling

Published online by Cambridge University Press:  01 January 1992

Paul A. Roland ,
Sam J. La Placa  and
James J. Wynne
Paul A. Roland
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598-0218
Sam J. La Placa
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598-0218
James J. Wynne
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598-0218
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Abstract

Photoablation of isotopically pure boron metal and hexagonal boron nitride with a 532 nm laser, followed by supersonic expansion cooling, produces a variety of Bx, and BxNy, clusters, which are detected by photoionization of the neutral clusters with a 194 nm laser, followed by time-of-flight (TOF) mass spectrometry. Under certain experimental conditions, the mass spectrum derived from boron nitride shows resolved peaks corresponding to the clusters Bx+1Ny+. Under different experimental conditions, the mass spectrum shows an unresolved region corresponding to clusters ranging from atomic mass unit 100–1000 as well as resolved peaks, corresponding to Bx+ clusters for x = 2 − 100. These resolved peaks grow with increasing photoionization fluence, while the envelope of the unresolved region changes shape and grows with a diminished dependence on fluence. These data are interpreted as evidence that the unresolved clusters are being photofragmented as well as photoionizated by the 194 nm radiation, and the products of such photofragmentation are the aforementioned Bx+ clusters.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 285: Symposium I – Laser Ablation in Materials Processing–Fundamentals and Applications , 1992 , 117
Copyright
Copyright © Materials Research Society 1993

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References

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