On 4 Dec 2008, at 05:14, Berger Raphael wrote: > My main problem is how to define the df-basis. my last try was: > > df-mp2,df_basis={La=vtz-pp;Br=tzvpp;} It is much easier to specify your DF basis within the basis block as a separate set. For example basis={ default,vtz set,dfmp default,vtz/mp2fit } hf df-mp2,basis=dfmp HTH, Grant