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generating plasmas on each side of the crystal to actThe authors are at Lawrence Livermore National as high voltage electrodes. The laser beam then passes Laboratory, Livermore, CA 94551, USA (deyoreo1@ through a set of phosphate glass booster ampli ers llnl.gov).before entering the nal spatial lter. The product of this portion of the laser system is a full uence beam with a wavelength of 1053 nm. However, because the

The kinetics of pyrolysis of a micro-crystalline cellulose in nitrogen were studied from TGA and DTG data, obtained with two different modes of heating: a dynamic mode at constant heating rates between 1 and 11 °C/min and an isothermal mode at various temperatures, kept constant between 280 and 320 °C. In isothermal mode, it appeared very clearly that the mass depletion shows a sigmoid profile characteristic of an auto-accelerated reaction process. This behaviour is consistent with kinetics of nuclei-growth, well represented by the models of Avrami-Erofeev and of Prout-Tompkins type. All the other kinetic models commonly applied