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利用红外激光多光子解离来分离氢氘同位素已取得很大进展。由于三氟甲烷是很理想的工作物质,近年来对CDF_3的光化学和光物理的研究非常活跃。我们发展了一种新型探测红外弱吸收的方法,即激光光热探测法。其原理是:分子吸收了共振激光的能量后产生热振荡,直接测量其能量即得分子的激光光热光谱。我们用此法研究了CDF_3在红外激光场下,由多光子吸收引起的选择性光化学过程,以及惰性气体对选择性的影响。
The use of infrared laser multiphoton dissociation to separate hydrogen and hydrogen isotopes has made great progress. Since trifluoromethane is an ideal working substance, the research on photochemistry and photophysics of CDF 3 has been very active in recent years. We have developed a new method of detecting weak infrared absorption, that is, laser photothermal detection. The principle is: the molecule absorbs the energy of the resonant laser to generate the thermal oscillation, and the laser photothermal spectrum of the molecule can be obtained by directly measuring its energy. We used this method to study the selective photochemical process of CDF_3 caused by multiphoton absorption under infrared laser field and the effect of inert gas on selectivity.