Collisional quantum interference (CQI) on rotational energy transfer was observed in Na2(A1Σu+, v = 8∼b3Π0u, v = 14) system in collision with Na [Chem. Phys. Lett. 318 (2000) 107], and the degree of the interference was measured. The integral interference angle was obtained through theoretical calculation. We will research the factors that have effect on collisional quantum interference on rotational energy transfer in Na2(A 1Σu+, v = 8∼b3Π0u, v = 14)−Na system. Basing on the time-dependent first order Born approximation, and taking into account the anisotropic Lennard–Jones interaction potentials and ``straight-line'' trajectory approximation, we obtain the factors that have effect on CQI in Na2-Na system, and obtain the relation between the integral interference angle and rotational quantum number.

In order to study the collisional quantum interference (CQI) on rotational energy transfer in atom-diatom system, we have studied the relation of the integral interference angle and differential interference angle in Na + Na2 (A1 σ+u, v = 8 ∼ b3п0u, v = 14) collision system. In this paper, based on the first-Born approximation of time-dependent perturbation theory and taking into accounts the anisotropic effect of Lennard–Jones interaction potentials, we present a theoretical model of collisional quantum interference in intramolecular rotational energy transfer, and a relationship between differential and integral interference angles.

Collisional quantum interference (CQI) in the intramolecular rotational energy transfer was observed in experiment by Sha and co-workers.[1] The interference angle, which measuring the degree of the coherence, were measured in the experiment of the static cell. Based on the first Born approximation of time dependent perturbation theory, taking into accounts the anisotropic Lennard–Jones interaction potentials, this paper describes the theoretical model of CQI in intramolecular rotational energy transfer in an atom-diatom collision system. In the model, the differential interference angle for the experiment of the molecular beam is calculated, the changing tendencies of the differential interference angle with the impact parameter and collision partners are obtained. This theoretical model is important for understanding or performing this kind of experiments.