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在经典光化学中,人们常用的是可见和紫外光源,而红外光源是不被人们所重视的,因为红外光子能量比较低,它只能影响分子中振动-转动能级的变化,不足於引起分子中化学键的断裂。但是,红外激光器的发光机理,完全不同於以往任何一种红外光源。红外激光束方向性好、能量高度集中,因而强度高、单色性好,在与物质相互作用过程中,产生前所未有的多光子吸收的现象。近年来,红外激光辐射已用于分离同位索、增强化学反应速率、激光引发的均相热解以及游离基的反应动力学研究等方面,一门崭新的红外激光光化学应运而生了。
In classical photochemistry, the commonly used visible and ultraviolet light source, and the infrared light source is not valued, because the infrared photon energy is relatively low, it can only affect the vibrational-rotational energy levels in the molecule, not enough to cause the molecule Breaking of chemical bonds. However, the infrared laser emission mechanism, completely different from any of the previous infrared light source. Infrared laser beam directivity, energy is highly concentrated, and therefore high intensity, good monochromatic, in the process of interaction with matter, resulting in an unprecedented phenomenon of multiphoton absorption. In recent years, infrared laser radiation has been used to separate isotopes, to enhance the chemical reaction rate, laser-induced homogeneous pyrolysis and radical reaction kinetics, etc., a new infrared laser photochemistry came into being.