在自吸背景校正中不被样品基体吸收的杂散光有不同于氘灯和塞曼背景校正的特殊性。用截止溶液法检验了杂散光的存在,并用重铬酸钾溶液分子吸收模拟背景吸收的方法研究了杂散光的影响。源于空心阴极灯光源的杂散光在样品束(常规脉冲低电流)和参比束(窄脉冲高电流)中的比率有很大的差异,前者比后者更高。这种差异是自吸背景校正误差的重要来源,在高背景校正时引起的误差不容忽视。文章还对杂散光比率与灯电流、光能量和光谱带宽等方面的关系进行了研究。结果表明,杂散光比率与灯电流大小有很大关系,灯电流大,杂散光比率小,但杂散光比率随灯电流的变化与被检测的分析线能量无直接关系;杂散光比率随着光谱带宽的减小而降低,其性质类同于连续光谱。

In self-reversal background correction the particularity of stray light that is not absorbed by the sample matrix is different from that in deuterium lamp and Zeeman background correction.The stray light is evaluated using the cut-off solution method and its effects were studied by means of simulation background absorption using potassium dichromate solution molecular absorption.Experiments confirmed that the stray light due to light source for the sample beam (Conventional pulse,low Current) and reference beam (narrow pulse,high current) is obviously different,with the former being higher than the latter.Therefore,the difference is an important source in self-reversal background correction errors and the errors can not be ignored in high background correction.The present paper also showed the relationships among stray light and lamp current,light energy,and spectral bandwidth.The results show that the ratio of stray light is much related to the lamp current,and the larger the lamp current,the smaller the ratio of stray light.The ratio of stray light that changes with lamp current is not directly related to the energy of analytical line.Stray light ratio decreases with the decrease in spectral bandwidth and its character is similar to continuous spectrum.