Dissociation rate of hot benzene

The dissociation rate of benzene and d(6)-benzene were measured under colli sion-free condition by multimass ion imaging techniques. The value of 1 +/- 0.2x10(5) s(-1) and 5 +/- 1x10(4) s(-1) were obtained for benzene and d(6) -benzene, respectively, with internal energy of 618 kJ/mol. The dissociatio n rate of benzene with internal energy of 483 kJ/mol was too slow to be mea sured, and the upper limit of the dissociation rate was estimated to be 3x1 0(3) s(-1). (C) 2000 American Institute of Physics. [S0021-9606(00)01725-6] .