G. Hadinger et al., ASYMPTOTIC CALCULATION OF THE EXCHANGE INTERACTION BETWEEN 2 LONG-RANGE INTERACTING ATOMS WITH OPEN VALENCE SHELLS OF ANY TYPE, Physical review. A, 50(2), 1994, pp. 1927-1930
A general analytical formula is proposed to estimate long-range two-el
ectron exchange interactions in the framework of an asymptotic method
for atoms with open shells of any angular type as well as for diagonal
and nondiagonal cases. Using the computer algebra language MAPLE V, f
ormulas have been derived for open valence shells of s, p, d, and f ty
pes.