Thermionic Emission and Fragmentation of C60
We analyze the rate of delayed (thermionic) ionization of photoexcited C60 molecules. The rate has a power-law dependence, indicating the presence of a continuum of rate constants. The value of the exponent provides information about the competition between delayed ionization and unimolecular fragmentation; it is equal to the ratio of the ionization energy and the activation energy for fragmentation. This result provides a novel method to measure the controversial bond dissociation energy of neutral C60. We obtain a value of 11.9±1.9eV.
Physical Reviw Letters
Digital Object Identifier (DOI)
K. Hansen and O. Echt, Thermionic Emission and Fragmentation of C60, Phys. Rev. Lett. 78 (1997) 2337 – 2340, DOI: 10.1103/PhysRevLett.78.2337.
©1997 American Physical Society