Atomic orbital alignment and coherence in N2O photodissociation at 193.3 nm

Abstract

Strong recoil-frame orbital alignment is observed in the O¹D₂ product following photodissociation of N₂O at 193.3 nm. Velocity map imaging allows for investigation of the angular distribution of this alignment, providing insight into the dynamics in the frame of the molecule. Analysis of the results using a rigorous quantum mechanical theory yields alignment anisotropy parameters having direct physical significance. This alignment is dominated by strong incoherent parallel and perpendicular contributions. In addition, evidence is shown of a contribution from a perpendicular coherence. These results provide detailed insight into the dynamics of the photodissociation process and the nature of the electronic transitions responsible for the initial excitation.