测定硫脲分子N-C=S伸缩振动模式(ν_(N-C=S))的红外光谱(IR)。研究发现:在1500 cm-1~1430 cm-1、1450 cm-1~1350 cm-1和1120 cm-1~1050 cm-1的频率范围内,硫脲分子ν_(N-C=S)分子中分别存在着3个特征谱带,分别归属于ν_(N-C=S)(Ⅰ)-1、ν_(N-C=S)(Ⅱ)和ν_(N-C=S)(Ⅲ)。最后采用二维红外光谱技术(2D-IR)进一步来研究温度变化对于硫脲ν_(N-C=S)红外吸收强度及其变化顺序的影响。本项研究拓展了二维红外光谱技术在ν_(N-C=S)的研究范围。 The infrared spectrum (IR) of thiourea molecule N-C = S stretching vibration mode (ν_ (N-C = S)) was determined. The results showed that in the frequency range of 1500 cm-1 to 1430 cm-1, 1450 cm-1 to 1350 cm-1 and 1120 cm-1 to 1050 cm-1, There are three characteristic bands, belonging to ν_ (NC = S) (Ⅰ) -1, ν_ (NC = S) (Ⅱ) and ν_ (NC = S) Finally, the effect of temperature on the infrared absorption intensity of thiourea ν_ (N-C = S) and its order of variation was further studied by 2D-IR. This study expands the study of ν_ (N-C = S) in two-dimensional infrared spectroscopy.