Photoexcited C-60: Fragmentation and delayed ionization

We investigate two reaction channels of C-60, 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 C-4 Or larger fragments contributes significantly to the production of even-sized fragment ions. ii) We count the number of delayed electrons emitted from C-60, or one of its products, after photo-excitation. For high laser fluences, this number reaches a value of (2.6 +/- 1.1)% per photoexcited C-60. This sets a lower bound to the ratio of effective rate constants, k(e)(E*)/Sigma k(j)(E*), where k(e) refers to electron emission, and the sum in the denominator extends over all reaction channels.