乐果晶体及其熔体的拉曼光谱研究

Raman Scattering Studies of Dimethoate Crystal and Melt

在785nm激发波长观测了乐果晶体及其熔体拉曼光谱,结果显示乐果晶体60℃熔化后在344,428和530cm-1处出现新峰,498cm-1处,(P-S)和648cm-1处,(P=S)峰强度发生反转,,(P=S)峰发生反常蓝移现象。这表明晶体结构长程有序性破坏对乐果拉曼光谱存在较强影响,在有关乐果溶液拉曼光谱实验和理论研究中应予以考虑。

We detect Raman spectra of dimethoate crystal and melt at 785 nm. The results show new Raman peaks appear at 344, 428 and 530 cm-1 after dimethoate crystal melting at 60~C, the intensities of v（P-S）（～498 cm^-1） and v（P=S）（～648 cm^-1） are reversed, v（P=S） line takes abnormal blue shift. This indicates that the failure of crystal structure has large effect to Raman spectra of dimethoate, it should be taken into account in the ex- periment and theory research of dimethoate solution.