Time evolution of emission by carbon nanoparticles generated with a laser furnace technique

Time evolution of emission by carbon nanoparticles generated with a laser f urnace technique was investigated with a high-speed video camera. Assuming blackbody radiation formula for small spherical particle, the internal temp erature of these carbon nanoparticles was determined as a function of time delay (Deltat) after laser vaporization. It was found that the internal tem perature of them drastically decreased at, Deltat < 400 <mu>s through colli sion with the surrounding rare gas inside the furnace. On the other hand, i n particular laser vaporization condition where yields Of C-60 and other hi gher fullerenes in the soot were found to be high, an increase in the black body emission intensity could be recognized for longer wavelength (660 < <l ambda> < 830 nm) at <Delta>t > 400 mus. This finding suggests that a certai n exothermic process related to the formation of C-60 and other higher full erenes should occur at Deltat > 400 mus inside the furnace.