Molecular absorption of electromagnetic wave, from a kind of physical phenomenon known as “resonance” .For example, we used to say don’t Marchwhen a large force across the bridge.This is afraid of thepace of vibration and vibration bridge together, (vibration always exists objectively, just some weak so it is difficult for us to feel, but the instrument can measure.)then “overlay”.Load increases  bridge vibration cause landslides. This is a common “resonance” phenomenon.

Similarly, there is also a “vibration” of a different kind of energy levels in molecules inside,  equal to the energy of two different energy level difference when Externally added energy .the molecules will absorb the Externally added energy , which is the “resonance”  of atomic molecular level.Ozone can absorb ultraviolet light, which is due to the molecular structure that it can be Produce the “resonance” with the ultraviolet radiation(within a certain range).ozone be skilled in, just absorb specific part. However, it absorbs part happens could lead to skin cancer, that means a lot coming from “murderer”, We think it exists for many kinds of molecules. The mean,  just different for absorbing electromagnetic wave.