Collision-induced quantum interference (CQI) was demonstrated within energy transfer of CO(A(1)Pi,v= 0-e(3)Sigma(-),v = 1)-He in a gas cell, where interference angle theta(ST) represents some 'average' effect for collisions with different impact parameter h and collision velocity v. By using quantum scattering theory, a method of calculating differential interference angle theta(D)(ST), which is related to b and v, was presented. O-ST(D) was calculated for CO(A/e)-He with all v and b values that are physically significant. Results obtained for O-ST(D) are in the range of 30-70 degrees, which imply there is no problem of cancellation between positive and negative interferences and 'average effect' is not serious. (c) 2006 Elsevier B.V. All rights reserved.