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Internet Electronic Journal of Molecular Design - IEJMD, ISSN 1538-6414, CODEN IEJMAT
ABSTRACT - Internet Electron. J. Mol. Des. March 2006, Volume 5, Number 3, 150-167

The C3 Puzzle: Formation of and Spontaneous Emission from the C3 Radical in Carbon Plasma
László Nemes, Anna M. Keszler, Christian G. Parigger, James O. Hornkohl, Hope A. Michelsen, and Vadim Stakhursky
Internet Electron. J. Mol. Des. 2006, 5, 150-167

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Abstract:
In this review work we address the problem of observing spontaneous emission from the Swings transitions of the C3 radical in laser-generated graphite plasma. We summarize the spectroscopy of the C3 radical in carbon vapor and plasma, sketch the chemical routes leading to this carbon cluster under plasma conditions, review some theoretical calculations, and then present our own emission spectroscopy, experimental investigations. We report time-averaged, laser-induced optical breakdown spectra from Nd:YAG laser generated graphite micro-plasma. In 200-300 torr of argon and helium, a weak emission continuum was observed centered at 400 nm when using laser fluence of about 1 J cm-2. We conclude that observation of the 400 nm carbon plasma continuum depends critically on the experimental configuration. Assignment of this continuum to the C3 radical is not as straightforward as may have been thought previously. Further possibilities are considered for the origin of this continuum.

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