B.1.6 Keyword: $ecp

$ecp
For each atom that will bear an ECP
      Chemical symbol for the atom
      ECP name; the $L$ value for the ECP; number of core electrons removed
      For each ECP component (in the order unprojected, ${\widehat{P}}_0$, ${\widehat{P}}_1$, , ${\widehat{P}}_{L-1}$
            The component name
            The number of Gaussians in the component
            For each Gaussian in the component
                  The power of $r$; the exponent; the contraction coefficient
****
$end

Note:  (1) All of the information in the $ecp block is case–insensitive. (2) The $L$ value may not exceed 4. That is, nothing beyond $G$ projectors is allowed. (3) The power of $r$ (which includes the Jacobian $r^{\mathrm{2}}$ factor) must be 0, 1 or 2.