Abstract
Two types of carbon materials after the powerful laser influence were studied. First - low grade pyrolitic graphite, second - 10 micron film of the amorphous line- chain carbon. The film was prepared by the method of Ar ion assisted deposition of carbon plasma. The samples were irradiated by a 1.06 micro wavelength Nd laser in vacuum 0.3 Pa. The energy of the laser pulse was approximately 70 J, the duration 580 ps and intensity 440 GW/cm2. After the experiments the samples were examined by means of transmission electron microscopy. Auger and Raman spectroscopy. The formation of carbyne crystals with lattice parameters 'a' 0.516 and 0.533 nm were detected in the shocked samples. A small amount of nanodiamond was detected, too. An interesting feature is the formation of large carbyne crystals in pyrographite. Raman spectra of recovered materials exhibit strong peaks at the frequencies corresponding to the oscillations of carbon atoms in line- chain structures.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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