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We measure the flow regime change of C60 molecular beams, produced by a Knudsen oven with an orifice (diameter, 1 mm; thickness, 0.5 mm), from effusive to transitional. We determine the change temperature to be about 800 K and find an inefficient translational cooling of C60 molecules in the transitional regime. Such an inefficient cooling leads us to modify the velocity distribution function assumed...
Laser-induced fragmentation of C 60 has been studied using a time-of-flight mass spectrometric technique. The average kinetic energies of fragment ions Cn+ (n⩽58) have been extracted from the measured full width at half maximum (FWHM) of ion beam profiles. The primary formation mechanism of small fragment ion Cn+ (n<30) is assumed to be a two-step fragmentation process: C 60 sequential...
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