Accurate double many-body expansion potential energy surface of HS<sub>2</sub>A<sup>2</sup>A′) by scaling the external correlation

Accurate double many-body expansion potential energy surface of HS₂A²A′) by scaling the external correlation

Zhang Lu-Lu, Song Yu-Zhi^†,, Gao Shou-Bao, Zhang Yuan, Meng Qing-Tian^‡,

Potential energy curves of (a) S₂(a ¹Δ_g) and (b) SH(X²Π), and the differences between the fitted PECs and the ab initio points.