科研之友
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摘要
Laser-induced fragmentation of C60 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: C60 sequential decay to unstable C30+ ion and the binary fission of C30+. Considering a second photo absorption process in the later part of laser pulse duration, good agreement is achieved between experiment and theoretical description of photoion formation.
