non-radiative transition

His thesis focused on the theory of non-radiative transitions in large molecules.

From level 4, the atoms again decay by a fast, non-radiative transition Ra into the level 3.

At this point the very large vibronic coupling induces a non-radiative transition (surface-hopping) which leads the molecule back to its electronic ground state.

The reactivity of et− with scavengers, including protons, is discussed in terms of the theory of multi-phonon non-radiative transitions.

A three-level system could also have a radiative transition between level 3 and 2, and a non-radiative transition between 2 and 1.

In silicon or germanium diodes, the electrons and holes usually recombine by a non-radiative transition, which produces no optical emission, because these are indirect band gap materials.

Both theories are, however, semiclassical in nature, although they have been extended to fully quantum mechanical treatments by Joshua Jortner, Alexender M. Kuznetsov, and others proceeding from Fermi's Golden Rule and following earlier work in non-radiative transitions.