Ir basis sets (w/ ECPs)

[CUNDARIT : at : MSUVX1.MEMST.EDU]

 	We just published a paper in JACS (1st issue of the year, ca.
 page 340, sorry I'm out of town and don't have the ref.) in which we
 looked at methane activation by Ir complexes using the ECPs and attendent
 valence basis sets of Walt Stevens and co.  Indeed, Walt et al. have
 developed a consistent ECP/valence basis set scheme up to Rn (I noticed
 someone was interested in Ba a few days ago).  We have used the transition
 metal ECPs and valence basis sets extensively and find that in the overwhelming
 majority of cases, if you're using the right type wwavefunction (RHF, GVB,
 MCSCF,
 etc.) you're gonna  get good results.
 	To be fair, the Los Alamos people have developed ECPs for Ir,
 although off the top of my head I can't recall an application.  Same
 thing applies to the ECPs developed by Pitzer et al.
 	The Stevens ECP/basis set scheme is quadruple zeta for the
 s and p manifolds; triple zeta for the d manifolds.  I believe
 Frenking et al. have optimized f exponents for the entire transition
 series if you want to add polarization.  I believe this was in a
 recent Chem Phys Letter.
 	Hope this is of some help.
 Tom