3-21SP and 4-22SP basis sets

[susilehtola]

Mitin, Hirsch and Bunker have reported small split-valence 3-21SP and 4-22SP basis sets as more accurate alternatives to 3-21G and 4-31G. The sets are described in

• Chem. Phys. Lett. 259, 151 (1996) for first-row atoms and
• J. Comput. Chem. 18, 1200 (1997) for second-row atoms