# Thermionic emission, delayed emission and predissociation

In molecular photodissociation, the thermionic emission, delayed emission and predissociation are the same? Otherwise, what is the difference between them?

My question is not about the solids, but I am saying about molecules/clusters.

References:

1. J.U. Anderson et.al., J.Phys.B: At.Mol.Opt.Phys. 35 (2002) R1-R30.
-
Thermionic emission and delayed emission are normally properties of metals, or at least solids, and I can't see any relation to photodissociation of molecules. Can you make your question a bit clearer because it isn't obvious what you're asking. –  John Rennie Mar 11 '13 at 18:14
@JohnRennie: Thermionic emission and delayed emission happens in clusters as well. My question is about the clusters. –  albedo Mar 12 '13 at 12:43
@JohnRennie: for reference: Reference: J.U.Anderson et.al. J.Phys.B: At.Mol.Opt.Phys.35(2002)R1-R30. –  albedo Mar 12 '13 at 12:49