3-21g* basis set in g92 calcs

[<DAN - at - chem.wisc.edu>]

 Dear netters,
 In using a 3-21G* basis for geometry optimization of the
 h4sio4 molecule (as an example), d-orbitals are added to
 the Si as polarization functions but are not added to the
 oxygens. A reviewer of a recent manuscript claimed this was
 an "unbalanced basis set". I would contend that adding d-
 orbitals to the Si creates a more balanced basis set. Please
 set me straight on this matter.
 Also, while scanning the g92 basis file directory, I did
 not observe any 321S.GBS data file (in contrast there are
 6311.GBS, 6311S.GBS, and 6311SS.GBS data files). From what
 file are the Si d-orbital values obtained from when using
 the 3-21G* level?
 Thanks,
 Dan Sykes
 Department of Chemistry
 University of Wisconsin-Madison
 Madison, Wisconsin  53706
 phone (608) 262-6891
 Fax   (608) 262-0381
 email dan - at - chem.wisc.edu