
10 &amp; 11 potentials.</EM>

<P>

<H3><A ID="SECTION00044400000000000000">
Pairwise couplings</A>
</H3>
For TYPEs 12&ndash;17, namelists <B>&amp;step</B> are read to determine the details of the
required couplings between each pair of excited states
and of the reorientation terms for each individual state.
<DL>
<DT><STRONG>&amp;step</STRONG></DT>
<DD><B>IB,I A, k, STR /
</DD>
</DL></B>
    to put in a coupling <EM>to</EM> state IB <EM>from</EM> state IA,
of multipolarity k and strength STR.
These are term