热电离质谱计信号放大器非线性校正技术  

Calibration Technique of Nonlinearity of the Signal Amplifiers of TIMS

作　　者：魏兴俭[1] 邓大超[1] 廖俊生[1] 余春荣[1] 袁莉[1] 

机构地区：[1]中国工程物理研究院,四川绵阳621900

出　　处：《质谱学报》2009年第4期239-243,共5页Journal of Chinese Mass Spectrometry Society

基　　金：中国工程物理研究院基金(SJZ2005-1)资助

摘　　要：从理论上研究了热电离质谱计法拉第杯接收器放大器的非线性效应,建立了校正的数学模型。应用该模型,可以用一种同位素标准物质直接检验法拉第接收器放大器的非线性,而不用常规的系列同位素标准物质来检验放大器非线性。应用UTB-500铀同位素标准物质、峰跳扫描质谱测量技术,检验了一台热电离质谱计法拉第接收器放大器的非线性,并对存在的非线性进行了校正。同时,验证了在同位素丰度比值一定的情况下,非线性校正因子是恒定的,它不随离子流信号强度的变化而变化。The nonlinearity of the Faraday detector＇s amplifiers of a thermal ionization mass spectrometer （TIMS） was investigated, and the mathematical model of calibration was built. Using the model, a kind of isotopic reference material could be used to calibrate the nonlinearity of the Faraday detector＇s amplifiers, directly. Correspondingly, a series of isotopic reference materials must be used to calibrate the nonlinearity, generally. The nonlinearity of the Faraday detector＇s amplifiers of a thermal ionization mass spectrometer was researched by UTB-500 uranium isotope reference material and peak-jumping mass spectrometry measurement technique. The results show that the nonlinearity can be calibrated, commenda,bly. Furthermore, the experiment proves that the factor of the nonlinearity is constant at fixed isotopic ratio, and the factor is unchangeable at variation ion current.

关 键 词：热电离质谱计 信号放大器 非线性 校正 

分 类 号：TN152[电子电信—物理电子学] O657.63[理学—分析化学]