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Tunable Laser Desorption from Diamond Films and Pyrolytic Graphite

Published online by Cambridge University Press:  01 January 1992

A. Ueda ,
J. T. Mckinley ,
R. G. Albridge ,
A. V. Barnes ,
N. H. Tolk ,
J. L. Davidson  and
M. L. Languell
A. Ueda
Affiliation:
Center for Molecular and Atomic Studies at Surfaces, Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 USA
J. T. Mckinley
Affiliation:
Center for Molecular and Atomic Studies at Surfaces, Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 USA
R. G. Albridge
Affiliation:
Center for Molecular and Atomic Studies at Surfaces, Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 USA
A. V. Barnes
Affiliation:
Center for Molecular and Atomic Studies at Surfaces, Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 USA
N. H. Tolk
Affiliation:
Center for Molecular and Atomic Studies at Surfaces, Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 USA
J. L. Davidson
Affiliation:
Department of Electrical Engineering, Vanderbilt University, Nashville, TN 37235 USA
M. L. Languell
Affiliation:
Department of Electrical Engineering, Vanderbilt University, Nashville, TN 37235 USA
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Abstract

We report the observation of wavelength-dependence in the early phases of the laser ablation of chemical vapor deposited (CVD) diamond films. The measurements were made with 3–4 μm infrared radiation from the Vanderbilt Free-Electron Laser (FEL), the brightest tunable mid-infrared FEL in the world. Though we do not propose any specific mechanism for the ablation, the C-H bond-stretching mode at 3.47 μm is clearly important in the early stagesof the damage process, as evidenced by a sharp drop in the ablation threshold near 3.47 μm.The ablation damage threshold was determined by directing a single FEL pulse at the sampleand measuring the diameter of the resulting hole using a scanning electron microscope (SEM).This measurement was repeated for several pulse intensities. The damage threshold was defined as the extrapolation to zero hole diameter. We also looked at the desorption productsusing a time-of-flight spectrometer and a quadrupole mass analyzer. C2 is the dominant desorbed species. Visible light emission was monitored with a monochromator and photodetector.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 285: Symposium I – Laser Ablation in Materials Processing–Fundamentals and Applications , 1992 , 215
Copyright
Copyright © Materials Research Society 1993

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References

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