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The subroutine SSC investigates the spin-spin operator, which
has the tensorial form:
and finds the submatrix element of this operator between functions
with any number of open shells.
This subroutine is used for all distributions except
,
,
,
,
and
.
In the latter cases, instead of subroutine SSC the subroutines
SS1111, SS1212, SS1212, SS1221,
SS1221 and SS1122 are used.
The subroutine SSA investigates the
submatrix elements of the spin-spin interaction operator
and
respectively.
This subroutine is used for all distributions except
,
,
and
.
In the latter cases, instead of subroutine
SSA the subroutine SS1 is used.
2001-12-07