NING: NOT TESTED YET.</b>

<br/><i>Options</i>:
<ul>
<li><b>sae</b>:  Single-active-electron approximation. This option is only valid for time-dependent
 calculations (<tt>CalculationMode = td</tt>). Also, the nuclei should not move.
 The idea is that all orbitals except the last one are frozen. The orbitals are to
 be read from a previous ground-state calculation. The active orbital is then treated
 as independent (whether if it contains one electron or two) -- although it will
 feel the Hartree and exchan