Dissociation occurring by
tunnelling from a '
bound' to an '
unbound' vibronic state. In an
absorption spectrum of a molecular entity, the appearance of a diffuse band region within a series of
sharp bands is called predissociation, since
irradiation with frequencies within the diffuse region leads to effective
dissociation. The energy of the band is smaller than that of the
dissociation continuum of the bound state.
Source:
PAC, 1996, 68, 2223
(Glossary of terms used in photochemistry (IUPAC Recommendations 1996))
on page 2266
Cite as:
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.
https://doi.org/10.1351/goldbook.
