正交型光热偏转光谱法及其差分构型研究

INVESTIGATION OF RIGHT-CROSSED PHOTOTHERMAL DEFLECTION SPECTROMETRY AND ITS DIFFERENTIAL CONFIGURATION

本工作设计了一种新的差分式光热偏转光路构型,光路的优点是只使用单一的位置传感器,可随意调节样品池和参考池的距离,电学补偿和差分光路装置简单,容易调整,可以有效地消除溶剂空白吸收的影响和泵浦激光功率起伏的影响。文章还讨论了该差分构型的原理,差分响应公式和基本实验参数。获得的结晶紫和钴的检测下限分别为8.0×10^(-10)mol/L和60ng/ml,对应的最小吸光度分别为1.2×10^(-8)和5.4×10^(-8)。

A new differential photothermal deflection configuration was presented. This optical system has advantages including its ability to need only a single position sensor, to adjust the distance between the sample and reference cells conveniently, to align electronic compensation and differential optical system easily, and to eliminate the effect of the solvent absorption and power fluctuation in pump source efficiently. The principle of the differential configuration, the formula of differential response and the basic experimental parameters were discussed. The detection limits of 8.0×10^(-10)mol/L of crystal violet and 60ng/ml of cobalt were obtained respectively, which correspond to minimum measurable absorbances of 1.2×10^(-8)and5.4×10^(-8).