The maximum limit of rotational energy transfer in collisions of N2 with Ne and the power-gap law

The well-known parameter |ΔE|∗, given by the power-gap law has been investigated for different types of potential energy surfaces over a wide range of collision energy and the reduced mass of the system. The classical limit of maximum rotational energy transfer has been reviewed for a hard ellipsoid potential model. The existence of the parameter |ΔE|∗ and its numerical equivalence with (ΔE)max shows that the classical limit of angular momentum transfer given by the hard ellipsoid potential is meaningful even for the cross-sections computed on the real potentials, provided the classical turning-point surface of the soft potential is assumed as the hard potential surface.