Abstract
Abstract This article reviews, on the basis of mass spectrometric experiments, the current status concerning the C 2 binding energy or evaporation energy in C 60 , D (C 58 –C 2 ) = Δ E vap (C 60 ). Kinetic energy release distributions, time-resolved metastable fractions, breakdown curves, and thermionic emission rates all point to Δ E vap (C 60 + ) ≥ 9.5 eV and Δ E vap (C 60 ) ≥ 10 eV. These results are in agreement with high-level ab initio density functional theory calculations and with expectations from the known heats of formation of C 60 , C 70 , and C 2 . The C 2 evaporation is characterized by a very loose transition state with a pre-exponential factor close to the calculated upper limit.
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