THE EFFECT OF TEMPERATURE ON THE STRUCTURE OF AMORPHOUS HYDROGENATED CARBON

The results of complementary inelastic neutron scattering and infrared spectroscopy studies on the structure of amorphous hydrogenated carbo n (a-C:H) as a function of temperature are presented, up to a maximum temperature of 1000 degrees C. These complementary data show that chan ges in the network structure occur on heating to only 200 degrees C, w ith the amorphous network becoming progressively aromatic even before significant hydrogen loss occurs at temperatures above 400 degrees C. Reference is also made to earlier, diffraction-based studies of the ef fects of heating a-C:H).