Table 2. Calculated Potential Energy Surface Critical Points in eV at the XMCQDPT2(10,9)/aug-cc-PVDZ Level of Theory for pCK^– and pCEs^–

	pCK–	pCEs–
VEEa	2.87	2.96
S1 min	2.69	2.85
S1 TS‡b	0.15	0.33
E–Z CI	2.62	2.82

^aVEE = vertical excitation energy.

^bRelative to S₁ min. Values relative to the Franck–Condon geometry are given in the text.