In the online manual example of <a href="http://h2s_diab1.com">h2s_diab1.com</a> under quasi-diabatization procedure, the hf input has the following wavefunction specification-<br><pre>{hf;occ,9,2;wf,18,2,4;<br>orbital,2100.2}<br>
</pre>which means that a wavefunction of space symmetry 2(corresponding to B1 irreducible representation) of 2S=4 (quintet) is being calculated.<br>The next line with MULTI program has the following input - <br><br><pre>
{multi;occ,9,2;closed,4,1;<br>wf,18,2;state,2; !1B1 and 1A2 states<br>natorb,reforb !Save reference orbitals on reforb<br>noextra} !Dont use extra symmetries<br></pre>I have two questions-<br>
1. There are 2 states being calculated of space symmetry 2, i.e, belonging to B1 representation. How does this input allow calculation of a state belonging to A2 representation? Have I misunderstood the input? (the output also says that there are 2 states of sym 2 being calculated) <br>
2. HF calculation is being done for a quintet and the multi calculation is being done for a singlet. Is this a meaningful thing to do?<br><br>I apologize if these are naive questions.<br><br clear="all">-- <br>Jayashree<br>