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Downshift of Raman peak in diamond powders

Published online by Cambridge University Press:  31 January 2011

Xing-Zhong Zhao ,
K. A. Cherian ,
Rustum Roy  and
William B. White
Xing-Zhong Zhao
Affiliation:
Intercollege Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
K. A. Cherian
Affiliation:
Intercollege Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Rustum Roy
Affiliation:
Intercollege Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
William B. White
Affiliation:
Intercollege Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
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Extract

Results are presented on the influence of the size of diamond powders and the laser power on the main Raman line. These results show conclusively that there is a consistent and systematic, reversible, downshift with both decrease of powder size, and increase of power. The shift can be explained by local heating of about 500 °C in the extreme case. Its significance applies to interpretation of the alleged “downshifting” of the 1332 cm−1 line in all diamond research. In the future, the grain size, the thermal contact, and the beam power must be carefully monitored in reporting and interpreting any frequency shifts.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 7 , July 1998 , pp. 1974 - 1976
Copyright
Copyright © Materials Research Society 1998

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