天然与处理翡翠的光谱学研究

文章通过对天然翡翠和漂白充填处理翡翠的共焦显微拉曼光谱(514nm)测定,得到表征翡翠硬玉结构的拉曼位移为1036cm-1,696cm-1和374cm-1,显微放大能观察到翡翠经酸洗产生的裂纹及其充填的有机物,经红外光谱的测定证实该充填物为环氧树脂,且表征环氧树脂的拉曼峰为777cm-1,1123cm-1,1611cm-1,2930cm-1和3065cm-1;通过相同测试条件下,并在极短的积分时间内对天然翡翠的绿色、白色部位和染绿色翡翠进行拉曼光谱(785nm)测定,并结合绿色翡翠紫外-可见光-近红外吸收光谱的测定,得到吸收光谱中的吸收峰637nm,658nm和691nm归属于翡翠晶体中的Cr3 ,Cr3 的大量存在将使翡翠的拉曼光谱产生极强的荧光,而染色翡翠中染料产生的荧光相对较弱.

Study on Spectroscopy of Natural and Treated Jadeite

In this paper,natural jadeite,bleached and filled jadeite were tested by Confocal Micro Raman Spectroscopy(514nm),it was gained that Raman shifts 1036cm-1,696cm-1and 374cm-1are proper for jadeite,it was also found the existence of cracks and organic polymer filled in those cracks observed by its micrograph.Via tested by infrared spectrometer,the organic polymer filled was confirmed as epoxy resin,thus the diagnostic Raman shifts of epoxy resin are 777cm-1,1123cm-1,1611cm-1,2930cm-1and 3065cm-1.Green and white points of natural jadeite and jadeite dyed with green color were tested by Raman spectrometer(785nm),those samples tested in same testing condition and in short integral time,and combined UV-Vis-IR absorption spectrum of green point of jadeite,it was found that absorption peaks 637nm,658nm and 691nm was belonged to Cr3 which taking up crystal lattice of jadeite,and a mass of Cr3 existed in jadeite would produce extremely strong fluorescence,however,the intensity of fluorescence produced by coloring matter in dyed jadeites was much weaker.