Photoexcited C60: Fragmentation and Delayed Ionization
We investigate two reaction channels of C60, excited by a pulsed laser at 355 nm: i) The relative and absolute yields of even-sized fragment ions are measured over a wide range of laser fluences. At low fluence we find a dramatic dependence of the abundance ratio of C +n−2 versus C +n. This result argues against the notion that unimolecular emission of C4 or larger fragments contributes significantly to the production of even-sized fragment ions. ii) We count the number of delayed electrons emitted from C60, or one of its products, after photo-excitation. For high laser fluences, this number reaches a value of (2.6 ± 1.1)% per photoexcited C60. This sets a lower bound to the ratio of effective rate constants, ke(E* )/∑kj(E*), where ke refers to electron emission, and the sum in the denominator extends over all reaction channels.
Zeitschrift für Physik D Atoms,Molecules and Clusters
Digital Object Identifier (DOI)
R. Deng, G. Littlefield, and O. Echt, Photoexcited C60: Fragmentation and Delayed Ionization, Z. Phys. D 40 (1997) 355 - 360.