Can I use non-relativistic basis sets in ZORA calculations?
One should not use frozen core non-relativistic basis sets in ZORA calculations. However, for the light elements, say from H-Kr (Z=1-36), one can use all-electron non-relativistic basis sets in ZORA calculations. Note that, especially for the heavier elements, the core orbitals are described better with ZORA optimized basis sets (of the same size).
