|rotational control of photodissociation dynamics
rotational excitation of the parent molecule typically has a relatively small impact on both the dynamics and product-state distribution because of the small amount of energy involved in (thermal) rotational excitation as well as the weak coupling between the parent rotation and the dissociative coordinate. on some occasions, rotational excitation can be very important. here, i present two examples where the parent rotation controls the photodissociation dynamics. one is the photodissociation of o3 in the hartley band, in which the alternations of even and odd states in rotational distribution are dependent of initial rotational states of parent molecules due to a lambda doublet propensity. in another case, initial rotational states can strongly influence the vibrational state distribution of co fragment in hco photodissociation in the a-band. such unique phenomenon is rationalized by the dependence of the lifetime of the vibronic resonance facilitated by the renner-teller interaction. these two examples underscore the importance of rotational control in photodissociation.