An important property of the non-radiative transition between 3 E and 1 A is that it is stronger for m s = ? and weaker for m s = 0.
12.
If the time-dependence of is sufficiently slow, this may cause the state amplitudes to oscillate . ( E . g ., such oscillations are useful for managing radiative transitions in a laser .)
13.
This excited state S 1 can further relax to S 0 by IC, but also by an allowed radiative transition from S 1 to S 0 that emits a photon; this process is called fluorescence.
14.
For many materials ( for instance, semiconductors ), electrons move quickly from a high energy level to a meta-stable level via small nonradiative transitions and then make the final move down to the bottom level via an optical or radiative transition.
15.
However, for a spin state with m s = ? in 3 A, after the excitation, it has a relatively high probability to jump to the intermediate state 1 A by non-radiative transition and go to the ground state with m s = 0.
