An l‐dominant simplification of the close‐coupled equations for collisions between atoms and diatomic molecules

摘要: A major obstacle to the efficient quantum‐mechanical treatment of collisions between atoms and diatomic molecules is rapid proliferation in number coupled equations due 2j+1 projection degeneracy associated with each rotational level. Recently, considerable effort has been devoted development practical methods for reducing dimensionality these while preserving physically important aspects coupling levels. Reduction often achieved by simplifying role played centrifugal barrier. However, when at large total angular momentum (large J) make a contribution cross section, orbital l exerts importance. model calculation on Ar+N2 system indicated that J, T matrix dominated transitions states characterized small barriers. Consequently, we have developed an ’’l‐dominant’’ (LD) approximation which consists ne...