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The program `aoforce` computes force constants and IR and Raman
Spectra on SCF and DFT level. Analytical second derivative
calculations can directly be started from converged SCF or DFT
calculations. Note, that the basis is restricted to *d*
-functions, and
ROHF as well as broken occupation numbers are not allowed. For better
efficiency, in case of larger systems, use the keyword `$maxcor`
as described in Chapter 12 to reduce computational
cost. RI will be used if the RI option for DFT has been specified.

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