We present a new method based on optical null methods for simultaneously measuring the optical rotatory dispersion (ORD) and absorption spectra of chiral substances. The optical rotation angle at a specific wavelength can be obtained from the optical nulls of the Malus curves with and without the sample. We use the optical nulls of the two curves as benchmark points and the readings to the right of the benchmark points by a certain angular offset to eliminate the influence of the analyzer on the light intensity and obtain the absorbance of the chiral substance at a specific wavelength. The 4096 pixels of the line scan CCD can measure multiple wavelengths simultaneously so that continuous ORD and absorption spectra can be obtained. The experimental results show that the standard deviation of the specific optical rotation is 0.11 deg mL g⁻¹ dm⁻¹, the standard deviation of the maximum absorption wavelength is 0.45 nm, and that absorbance of the sample varies linearly with the concentration. This method is helpful for simplifying the experiment and has a profound influence on the analysis of the contents and molecular configurations of chiral substances in the future.

中文翻译：

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同时测量手性物质的旋光色散和吸收光谱。

我们提出了一种基于光学无效方法的新方法，用于同时测量手性物质的旋光色散（ORD）和吸收光谱。特定波长下的旋光角可以从有样品和无样品的Malus曲线的光学零点获得。我们使用两条曲线的光学零点作为基准点，并使用基准角右边的读数一定角度的偏移量，以消除分析仪对光强度的影响，并获得特定波长下手性物质的吸光度。线扫描CCD的4096个像素可以同时测量多个波长，因此可以获得连续的ORD和吸收光谱。实验结果表明，旋光度的标准偏差为0.11 deg mL g^-1 dm ^-1，最大吸收波长的标准偏差是0.45 nm，并且样品的吸收率随浓度线性变化。该方法有助于简化实验，对今后手性物质的含量和分子构型分析具有深远的影响。