nI_invariant_ladder_op_exc

public interface nI_invariant_ladder_op_exc

Evaluates $< D_i | S_+S- | a^\dagger_A a_I D_i > = 0$

Type	Intent	Optional	Attributes		Name
type(Excite_1_t),	intent(in)			::	exc

The matrix element is always exactly zero

Evaluates $< D_i | S_+ S_- | a^\dagger_A a^\dagger_B a_I a_J D_i > = 0$

Type	Intent	Optional	Attributes		Name
type(Excite_2_t),	intent(in)			::	exc

The matrix element. It is real even for complex NECI.

Evaluates $< D_i | S_+S_- | a^\dagger_A a^\dagger_B a^\dagger_C a_I a_J a_K D_i > = 0$

Type	Intent	Optional	Attributes		Name
type(Excite_3_t),	intent(in)			::	exc

The matrix element is always exactly zero