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| Application of derivative method in teaching of MIR spectroscopy |
| Chang Ming1, Wang Qian2, Zhang Bihan2, Li Zeteng1, Zhang Meihuan1, Yu Hongwei1, Xu Yuanyuan1 |
| 1. College of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, China; 2. College of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China |
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Abstract Taking medical white vaseline as an example, the MIR spectrum data were processed by derivative method. The structure of medical white vaseline was studied by using one-dimensional MIR spectrum combined with first derivative MIR spectrum, second derivative MIR spectrum, third derivative MIR spectrum and fourth derivative MIR spectrum. The results show that the medical white vaseline molecule mainly exists CH3 asymmetric stretching vibration mode(ν■), CH2 asymmetric telescopic vibration mode (ν■), CH2 symmetric telescopic vibration mode (ν■), CH3 asymmetric variable angle vibration mode (δ■), CH3 symmetrical variable angle vibration mode (δ■), CH2 in-plane rocking vibration mode (ρ■). The spectral resolution of the second derivative MIR spectrum is better than that of the corresponding one-dimensional MIR spectrum and the fourth derivative MIR spectrum. Choosing appropriate smoothing points can effectively improve the resolution ability of derivative spectrum, and provide theoretical support and practical application reference for expanding the application field of MIR spectrum.
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