光化学近20年来的迅速发展,使之成为化学科学中一个异常活跃的分支学科,并不断为现代高技术提供服务。特别是在激光技术有了长足发展的今天,把光化学研究推到了更高的层次。激光给了我们巨大的光能,它打开了在强光子领域中分子相互作用的新过程,尤其是可调谐的激光源还打开了许多通向非线性光谱领域的通道。传统的光化学考虑的只是一个光子被一个原子或分子吸收后在电子激发态所发生的化学反应过程,但在激光作用下,有两个可见光或紫外光子被分子吸收后,其分子状态就与只吸收一个单光子时完全不同了,往往是分子吸收的总能量已足以形成离子,从而开辟了通向离子化学的新途径。因此,利用激光所具有的单色性,定向性及其致密的能量等特点,可以控制高效率和高选择性的化学反应,这就为研制高性能新材料,高效率光能转换以及高选择性的精细化学合成 The rapid development of photochemistry in the past 20 years, making it an exceptionally active branches of chemistry, and continue to provide services for the modern high-tech. Especially in the laser technology has made great progress today, the photochemical research to a higher level. The laser light gives us enormous light energy, which opens up a new process of molecular interaction in the field of bright photons. In particular, tunable laser sources also open up many channels to the non-linear spectrum. The traditional photochemical consideration is only a photon by an atom or molecule in the excited state of the chemical reaction took place, but under the action of laser, there are two visible or ultraviolet photons absorbed by the molecule, the molecular state and the only When absorbing a single photon completely different, and often the total energy absorbed by the molecule has been sufficient to form ions, thus opening up a new way to ion chemistry. Therefore, the use of laser monochromaticity, orientation and its dense energy and other characteristics, can control the high efficiency and high selectivity of the chemical reaction, which is for the development of high-performance new materials, high efficiency light energy conversion and high selection Fine chemical synthesis