Abstract
Time-resolved appearance energies (AEs) were determined for C 58 + and C 56 + by electron ionization of C 60. Two methods were applied: (1) electron-space-charge trapping in the ion source of a tandem mass spectrometer and (2) Fourier transform mass spectrometry in an ion cyclotron resonance spectrometer. The AE for C 58 + obtained in the limit of long ion trapping time at an evaporation temperature of 620 K is 44 ± 2 eV. This corresponds to a minimum intrinsic kinetic shift, IS = 30.4 eV due to radiative decay and agrees with recent results that cooling of C 60 (and C 60 +) is dominated by black-body radiative decay below an internal temperature of 2300 K.
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