原子吸收光谱分析中,背景校正的好坏对于分析数据是否准确是至关重要的问题。自1968年以后大部分原子吸收分光光度计都配备了氘灯背景校正器。后来,塞曼效应背景校正器亦配备到某些仪器上。本文介绍一种新型的背景校正系统:史密斯—希菲埃系统(Smith-Hieftje)简称史密斯系统。史密斯系统最早是在1982年匹茨堡会议上提出的,它的基本原理极其简单。二十多年前人们即已知道:当某一过强电流通过空心阴极灯时,其发射线将会变宽,而被测物的原子吸收则大大地降低。这种效应称为自蚀。这是因为灯 Atomic absorption spectroscopy, the background correction is good or bad for the analysis of the accuracy of the data is crucial issues. Most atomic absorption spectrophotometers have deuterium lamp background correctors since 1968. Later, the Zeeman effect background corrector was also equipped on some instruments. This article describes a new type of background correction system: the Smith-Hieftje Smith System. The Smith system was first proposed at Pittsburgh in 1982 and its basic principle is extremely simple. More than two decades ago people knew that when an excessive current passed through a hollow cathode lamp, its emission line would widen and the atomic absorption of the analyte would be greatly reduced. This effect is called eclipse. This is because of the light