论文部分内容阅读
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
A special case of photocurrent - laser enhanced ionization (LEI) spectroscopy is a new flame spectroscopy method. There are various experimental devices for observing the LEI spectrum. The basic principle of LEI spectroscopy is as follows: The probability of collision ionization (thermal ionization) of an atom or molecule depends on the Arrhenius factor exp [- (Ei-Ej) / KT]. Where Ei is the ionization potential, Ej is the energy level at which the atom (or molecule) is located, K is the Boltzmann constant and T is the flame temperature. When Ei≈Ej, the ionization probability is close to 1. At T = 2500K (KT = 0.2eV), the probability of ionization increases by about two for every 1eV of (Ei-Ej)