SDTC.I. — Specify CI-active MOs in a SDT-CI calculation.

SDTC.I.=`n`

SDTC.I.()`n,m`

`n`

Use the n orbitals bracketing the SCF HOMO, possibly after MO reordering using
RECLAS(* n,m*), as
the CI-active MOs in a SDT-CI calculation (microstate space has only single, double and
triple excitations). The number of occupied CI-active MOs will be n / 2 + 1 if n is odd and
n / 2 if n is even. All of the partially occupied MOs should be included in the active
space.

`n,m`

Use orbitals n through m, possibly after MO reordering using
RECLAS(* n,m*), as
the CI-active MOs in a SDT-CI calculation (microstate space has only single, double and
triple excitations). All of the partially occupied MOs should be included in the active
space.

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