Question

Electronic excitation and molecular orbital view of excitation

Answer 1

Answer:

Explanation:

The electronic excitation induced by ionizing radiations is similar to the one created by visible and UV light, but energy levels reached with ionizing radiations are much higher. This gives highly excited molecules that may relax to give radicals through homolytic bond ruptures following reaction [II].

[II]AB~→AB⁎,AB⁎⁎→A°+B°

Here, AB denotes an organic molecule, AB⁎ and AB⁎⁎ respectively its excited and its highly excited forms, and A° and B° the resulting radicals. This simple reaction is presented for comprehension sake. More detailed mechanisms for radical formation in polymers are available in the literature (see for instance Figure 2). Apart from bond breaking, depending on its excitation level or its stability, the excited molecule can also transfer its excitation on a nearby molecule through various mechanisms (see Section 3.2.3).