Infrared absorption spectrum is also a kind of molecular absorption spectrum. when the sample is irradiated by infrared light with continuously changing frequency, the molecules absorb some frequencies of radiation, and its vibration or rotation motion causes the net change of dipole moment, resulting in the transition of molecular vibration and rotation energy level from the ground state to the excited state, which weakens the transmitted light intensity corresponding to these absorption regions.

Cigarette, fascinate a person, knowing that harm people, but can not stop.For a long time, people have tried to study a variety of smoking cessation methods, Chinese acupuncture has a treatment for smoking cessation, through the regulation of the nervous system to control dopamine secretion activity, dopamine system to restore balance, so as to relieve the body's dependence on nicotine.The principle of smoking cessation by laser is similar to that of acupuncture in Traditional Chinese medicine, but the operation is simpler.