Polycyclic Aromatic Hydrocarbons and Fullerenes as Decomposition Products of Hydrogenated Amorphous Carbon

摘要

The gaseous products evolved from solid hydrogenated amorphous carbon (HAC) under UV irradiation have been sampled using time of flight (TOF) mass spectrometry. A notable feature is the appearance of an extended sequence of aromatic carbon clusters containing in excess of 30 carbon atoms and including fullerenes such as C_50, C_60, and C_70. Under certain conditions, clusters containing up to several hundred C atoms are detected. The radiation-induced decomposition of HAC is found to occur in a series of stages in which small (<20 atom) molecules including alkanes and unsaturated carbon chain (C=C)_nH_m radicals with m = 14 are the first to be released