【摘要】 <正> 光电流效应的一个特例——激光增强电离（LEI）光谱是一种新的火焰光谱分析方法。观测LEI光谱有各种实验装置。LEI光谱的基本原理如下:在分析火焰中各种原子或分子之间碰撞速率为>10°秒^-1,一种原子或分子碰撞电离（热电离）的几率,取决于Arrhenius因子exp〔-（Ei-Ej ）/KT〕。式中Ei为电离电位,Ej 为原子（或分子）所处的能级,K为波耳兹曼常数,T为火焰温度。当Ei≈Ej时,电离几率接近1.在T=2500K（KT=0.2eV）情况下,（Ei-Ej）每增加1eV电离几率降低约两个数量更多还原

【Abstract】 study of the laser-enhanced ionization spectroscopy for sodium with a flash lamp pumped dye laser is described. Effects of the composition of flame gases, position of electrodes, laser excitation position, high voltage applied to the electrodes and the parameters of the dye laser on the LEI signal have been examined. The detection limit is 18 ng Na/m1. The relative standard deviation at 60 ng/ml is 5%.更多还原