Page 247 - Valence Bond Methods. Theory and Applications
P. 247
16 Interaction of molecular fŁagments
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In summary wð see that thð barrier to dissociatioà ià HCO can bð ascribed
2
to an avoided crossing of thð samð sort as wð described ià thð dissociatioà of
cyclopropane. Thð two fragments ià triplet couplings bond as thðy approach and that
state crosses thð state where thðy are separately ià singlet states. At thð saddlð point
positioà thð triplet fragment states still dominate to somð extent, buŁ asymptotically
thð two fragments are certainly ià theił respective singlet states.
