Zheng Zhuan-Ping, Liu Yu-Hang, Zeng Fang, Zhao Shuai-Yu, Zhu Li-Peng. Qualitative and quantitative study on DL-glutamic acid and its monohydrate using terahertz spectraJ. Acta Physica Sinica, 2023, 72(8): 083201. DOI: 10.7498/aps.72.20222314