GAUGE

> Specifies the choice of representation of the electric dipole operator. For polarizability, this keyword is ignored and `LENGTH` gauge is computed. For optical rotation and raman optical activity, this keyword is active, and acceptable values are `LENGTH` for the usual length-gauge representation, `VELOCITY``(default) for the modified velocity-gauge representation in which the static-limit optical rotation tensor is subtracted from the frequency- dependent tensor, or ``BOTH`. Note that, for optical rotation and raman optical activity calculations, only the choices of `VELOCITY` or `BOTH` will yield origin-independent results.

> - Type: string
> - Possible Values: LENGTH, VELOCITY, BOTH
> - Default: VELOCITY