# Diffuse functions for Ahlrichs/Karlsruhe basis sets in Gaussian?

As the question states, can one use the basis sets of Ahlrichs and coworkers (e.g. def2-SVP, def2-TZVP, ...) with diffuse functions (e.g. def2-TZVPD) in Gaussian?

The regular basis sets have been implemented, but not the diffuse functions according to their homepage. Is there some other way to access diffuse functions for these basis sets in Gaussian?

You can find the basis set specification for def2-TZVPD for the atoms you are interested from the Basis Set Exchange. From there, you can either just insert the diffuse functions after your molecule specifications using the keyword Extrabasis or just insert the whole basis manually using the gen keyword where you would normally put the name of the basis set.