  We calculate basis set limit extrapolated ionization potentials (IP) and
electron affinities (EA) with Slater Type Basis sets for the molecules in the
GW100 database. To this end, we present two new Slater Type basis sets of
triple- (TZ) and quadruple-$\zeta$ (QZ) quality whose polarization is adequate
for correlated-electron methods and which contain extra diffuse functions to be
able to correctly calculate electron affinities of molecules with a positive
Lowest Unoccupied Molecular Orbital (LUMO). We demonstrate, that going from TZ
to QZ quality consistently reduces the basis set error of our computed IPs and
EAs and we conclude that basis set limit extrapolation should give a good
estimate of these quantities at the complete basis set limit. With MADs from 70
to 85 meV, our basis set limit extrapolated ionization potentials are in good
agreement with results from TURBOMOLE, VASP and WEST while they differ by more
than 130 meV on average from nanoGW. With a MAD of 160 meV, our electron
affinities are also in good agreement with the WEST code. Especially for
systems with positive LUMOs, the agreement is excellent. With respect to other
codes, the STO type basis sets generally underestimate EAs of small molecules
with strongly bound LUMOs.
