Energy transfer process with a low Franck–Condon factor because the nuclear
geometries of the minima on the ground- and excited-state potential
energy surfaces of the donor or of the acceptor are strongly displaced.
A Franck–Condon transition is always vertical. Thus, it is not strictly
correct to speak about non-vertical transition
. However, the term implies that
the projection of all the vibrational wave functions of the donor state onto
all the vibrational functions of the acceptor will result in low Franck–Condon factors.
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 374
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook