`ev`

, `nm`

, `1/cm`

, or `a.u.`

(default). The frequencies
may be either purely real or purely imaginary. For example, to
calculate dynamic polarizabilities at 590nm and 400i nm
(i is the imaginary unit), specify
$scfinstab dynpol nm 590 400 iand run

`escf > escf.out &`- .

`escf.out`

in the above example). For
conversion of the optical rotation in a.u. to the specific rotation in
deg[dm(g/cc)] see Eq. (15) of
ref. [75].
Note that convergence problems may occur if a frequency is close to an electronic excitation energy. This is a consequence of the (physical) fact that the response diverges at the excitation energies, and not a problem of the algorithm.

Static polarizabilities are calculated most efficiently by specifying

$scfinstab pollybefore starting