Meiting Zhang, Guangzhuang Cheng, Cuifeng Zhu, Xingzheng Shi, Xuefei Zheng, Chun Li, Guang Yuan. Measurement of Molar Absorptivity of Low-Concentration Carbonate Aqueous Solution in Mid-Infrared Region[J]. Laser & Optoelectronics Progress, 2021, 58(19): 1930001
- Laser & Optoelectronics Progress
- Vol. 58, Issue 19, 1930001 (2021)
Fig. 1. Principle of attenuated total reflection
Fig. 2. Optical constants and attenuated total reflection spectra of pure water. (a) Optical constants of pure water and ZnSe; (b) attenuated total reflection spectra of pure water
Fig. 3. Experimental infrared spectra of dilute sodium carbonate solutions
Fig. 4. Spectra before and after baseline adjustment
Fig. 5. Linear relationship between absorbance and concentration at 1392.51 cm-1 before and after baseline adjustment
Fig. 6. Optical constants of dilute sodium carbonate solutions before and after baseline adjustment
Fig. 7. Optical pathlength within the carbonate ions peak band after baseline adjustment
Fig. 8. Molar absorptivity before and after baseline adjustment
Fig. 9. Standard deviation of maximum molar absorptivity at different concentrations. (a) Before baseline adjustment; (b) after baseline adjustment
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Table 1. pH values of different concentrations of sodium carbonate solutions (25 ℃)
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Table 2. Linear expressions before and after baseline adjustment
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