Comparison of electrothermal atomization diode laser Zeeman- and wavelength-modulated atomic absorption and coherent forward scattering spectrometry
Comparison of electrothermal atomization diode laser Zeeman- and wavelength-modulated atomic absorption and coherent forward scattering spectrometry
复制标题
电热原子化二极管激光器塞曼和波长调制原子吸收与相干前向散射光谱测定的比较
DOI：
10.1016/j.sab.2008.10.026
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
G. Hermann
中科院分区：
文献类型：
--
作者：
C. Blecker;G. Hermann
采用石墨炉原子化法，在塞曼和波长调制条件下，用近红外半导体激光器进行原子吸收和相干前向散射光谱分析。分析曲线和检测限进行了比较。用50 Hz调制磁场，用10 kHz调制二极管激光器的波长。相干前向散射测量与交叉和轻微不交叉偏振器。结果表明，原子吸收光谱法的检出限与正交偏振片相干前向散射光谱法的检出限大致相同。根据明亮闪烁噪声限制激光光源的理论，采用偏振片稍不正交的相干前向散射光谱法获得的检测限和线性范围明显优于采用偏振片正交和原子吸收光谱法获得的检测限和线性范围。这是由于采用偏振光谱法的方法将激光强度波动减少到其信号携带分数的事实。
Atomic absorption and coherent forward scattering spectrometry by using a near-infrared diode laser with and without Zeeman and wavelength modulation were carried out with graphite furnace electrothermal atomization. Analytical curves and limits of detection were compared. The magnetic field was modulated with 50 Hz, and the wavelength of the diode laser with 10 kHz. Coherent forward scattering was measured with crossed and slightly uncrossed polarizers. The results show that the detection limits of atomic absorption spectrometry are roughly the same as those of coherent forward scattering spectrometry with crossed polarizers. According to the theory with bright flicker noise limited laser sources the detection limits and linear ranges obtained with coherent forward scattering spectrometry with slightly uncrossed polarizers are significantly better than those obtained with crossed polarizers and with atomic absorption spectrometry. This is due to the fact that employing approaches of polarization spectroscopy reduce laser intensity fluctuations to their signal carried fractions.