摘要
本文采用３５５ｎｍ脉冲激光脱附和光解一些金属氯化物（ＣｕＣｌ２，ＡｇＣｌ和ＣｓＣｌ）薄膜产生高动能的超热氯原子．用飞行时间质谱法测得生成的Ｃｌ原子的动能分布很宽，最大动能可达６ｅＶ左右．氯化物薄膜厚度对Ｃｌ原子的最大动能有明显的影响．增加激光能量密度将使Ｃｌ原子最大动能迅速增高．此外，还讨论了上述产生起热Ｃｌ原子的机理．
Abstract The irradiation of metal chloride films (e. g. CsCl, AgCl and CuCl2) on the transparent substrate by a pulsed UV(355nm)laser is used to produce intense pulses of hyperthcrmal Cl atoms. The kinetic energy distributions of of atoms are measured by a time-of-flight mass spectrometer and has a broad energy distribution in the range from 0.0leV to 5.6eV. The most probable kinetic energy of Cl atoms, which is quoted as the corresponding to the maximun of the time-of-flight trace,can be increased by increasing film thickness and laser fluence. These results might be explained by laser-induced explosive dcsorption and shock wave heatingmechanisms.
基金
国家自然科学基金
