抄録
The He, Ar and the Penning gas pressure effects on the preparation yields of the fullerenes were investigated by means of the arc discharge method using graphite (PGX) anode buried in a tungsten rod and tungsten cathode for collector radii of 50mm. The maximum yield showed about 13-14% at 67kPa in He gas. The yields in the mixtures of He and Ne gases (the Penning effect) were similar to those obtained in He gas. Weight ratios of C60 to (C60+C70) were about 20% in Ar gas, while those in He and Penning gas were about 60%. Ultra sonic vibration was effective to separate C70 from soot.
