**Raman intensities** can be evaluated in a computation of a harmonic force field (keyword **VIB=ANALYTIC**) by specifying in addition **RAMAN_INT=ON** or **RAMAN_INT=DYN**. In the first case, the calculation is based on the geometrical derivative of the static polarizability tensor, while in the second case the derivative of the dynamical polarizability is computed.

At the CC level, all calculations have to be carried without orbital relaxation with respect to the electrical-field perturbations included (keyword **RAMAN_ORB=UNRELAXED**), while at the HF-SCF level orbital-relaxation necessarily has to be included (**RAMAN_ORB=RELAXED**).

Note that a frequency (within a **%frequency** section) has to be
given when differentiating the dynamical polarizability tensor.

**Examples**

Raman intensities within a harmonic force-field calculation

Recommendations for the calculation of Raman intensities