Impurity-Driven Cone Formation During Laser Sputtering of Graphite
- 12 March 1993
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 259 (5101) , 1590-1592
- https://doi.org/10.1126/science.259.5101.1590
Abstract
Sputtering of highly oriented pyrolytic graphite (HOPG) by 248-nanometer laser radiation was studied. Neutral carbon atoms and small clusters were ejected with significantly higher translational energies than were expected from a simple model of thermal vaporization in the absence of a potential barrier. The HOPG also developed a remarkable surface morphology that consists of regular cones and domes. Cone formation appears to be initiated by trace metal impurities that serve as heat shunts in this highly anisotropic material.Keywords
This publication has 12 references indexed in Scilit:
- Formation of ‘‘intrinsic’’ surface defects during 248 nm photoablation of polyimideJournal of Applied Physics, 1993
- Theory on laser sputtering by high-density valence-electron excitation of semiconductor surfacesSurface Science, 1991
- Some model calculations of carbon cluster growth kineticsThe Journal of Chemical Physics, 1990
- Microstructural studies of laser irradiated graphite surfacesJournal of Materials Research, 1990
- Ultraviolet laser ablation of organic polymersChemical Reviews, 1989
- On the effect of Knudsen-layer formation on studies of vaporization, sputtering, and desorptionSurface Science, 1988
- Production of large carbon cluster ions by laser vaporizationChemical Physics Letters, 1986
- Laser sputtering. Part II. The mechanism of the sputtering of Al2O3Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1984
- Experimental study of the sublimation of graphite at high temperaturesThe Journal of Chemical Physics, 1973
- Anisotropy of the Optical Constants and the Band Structure of GraphitePhysical Review B, 1969