assign_excitInfo_values_single_ex Function

    pure function assign_excitInfo_values_single_ex(gen, i, j, fullStart, fullEnd, typ) &
        result(excitInfo)
        integer, intent(in) :: gen, i, j, fullStart, fullEnd
        integer, intent(in), optional :: typ
        type(ExcitationInformation_t) :: excitInfo

        ! set default values for single excitations: which cause errors if
        ! called in incorrect places
        if (present(typ)) then
            excitInfo%typ = typ
        else
            excitInfo%typ = excit_type%single
        end if

        if (i == j) then
            excitInfo%excitLvl = 0
            excitInfo%weight = i
        else
            excitInfo%excitLvl = 1
            excitInfo%weight = 0
        end if
        excitInfo%k = 0
        excitInfo%l = 0
        excitInfo%secondStart = 0
        excitInfo%firstEnd = 0
        excitInfo%gen2 = -2
        excitInfo%order = 0.0_dp
        excitInfo%order1 = 0.0_dp
        excitInfo%overlap = 0

        ! then set proper values
        excitInfo%i = i
        excitInfo%j = j
        excitInfo%gen1 = gen
        excitInfo%fullStart = fullStart
        excitInfo%fullEnd = fullEnd
        excitInfo%currentGen = gen
        excitInfo%firstGen = gen
        excitInfo%lastGen = gen

        excitInfo%valid = .true.

    end function assign_excitInfo_values_single_ex