Excitation of the Molecular Vibration by Collision

Excitation of the molecular vibration in H 2 + H 2 collision is studied using the so-called modified wave number method. The same problem has been investigated quite recently by Salkoff and Bauer who applied the distorted wave method thoroughly without making the modified wave number approximation. Thus the present work serves as a test of the accuracy of the modified wave number method which has been used by many authors to study this sort of problem. The result obtained here is in good agreement with the result by Salkoff and Bauer.