The amounts of ultraviolet rays emitted during the arc electric discharge in which a carbon nanotube and a mesosize particle are formed were measured. It became clear that there were few amounts of ultraviolet rays, when a mesosize particle was generated, while the amounts of ultraviolet rays emitted were abundant, when a carbon nanotube was generated. The ultraviolet rays emitted at the time of arc electric discharge is related to the self-organization and the generation of nanotube and mesosize particle.
