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[求助] 文献上的一段,用的gaussian,请问描述La的一段用的基组是GENECP吗?还有什么

All structures were optimized at the DFT/B3LYP level of
theory using the Gaussian03 software. The H, C, N, O, F
and Cl atoms of the ligands were described by the 6-31G(d,p)
basis set. As f-orbitals do not play an important role in
metal–ligand bonding the 46 core and 4f electrons of the
LaIII, EuIII and YbIII lanthanides were described by quasirelativistic
effective core potentials (ECP) of the Stuttgart
group. For the corresponding valence orbitals the affiliated
(7s6p5d)/[5s4p3d] basis set was used enhanced by an
additional single f-function with an exponent of 0.591.

请问描述La的一段用的基组是GENECP吗?后边的基组又是什么,干什么的?由于是稀土,比较麻烦哈,求教大神
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