【摘要】 <正> 激光热透镜光度法是一种高灵敏度光谱分析技术。本文用探测束非聚焦的He-Ne激光双光束交叉热透镜技术研究了影响热透镜灵敏度的几个因素,并对远场光斑截面内信号强度分布进行了测定,对实验结果进行了讨论。在正交束构型的最佳参数下,检测了1-（2-吡啶偶氮）-2-萘酚（PAN）-Co（Ⅲ）的氯仿溶液,得到最小吸光度为1.17×10^-6,相当于1.7 ng/mL的更多还原

【Abstract】 A crossed-beam thermal lens technique, in which the unfocused probe beam crosses the pump beam at a certain angle within a homogeneous sample, was used to study the influences of thermal lens position effect, the size of heating beam focal spot, the modulation frequencies and the crossed angles on the thermal lens signals, and the thermal lens signal profile in the far-field. Under optimum conditions at right-crossed-beam, a PAN-Co(Ⅲ ) complex in chloroform was determined, the minimal detectable absorbance is 1. 17× 10-6, corresponding to 1. 7 ng/mL Co2+.更多还原