Fig. 1

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Ground state potential energy surface for the [H, P, S, O] species. Relative energies (in kcal mol−1) are calculated at the CCSD(T)/aug-cc-pV(Q+d)Z // MP2/6-311++G(d, p) level of theory and are relative to the SH + PO asymptote. MP2 zero-point vibrational energy is included in the relative energies. Isomer numbering is shown in bold.
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