计算机差谱技术在矿物红外光谱研究中的应用

在矿物红外光谱研究中运用差谱技术可消除其它矿物相谱带的覆盖,鉴定混合相中微量矿物成分,并得到单矿物谱图。 本文通过两个实例,介绍计算机差谱技术的特点、操作要点。云南腾冲热泉地区的粘土样品,用Perkin-Elmer983型红外分光光度计和3600数据站配合,应用视屏差减程序(Screen Diffe-rence)剥离掉主要组成矿物玉髓的红外光谱后,清晰显示出微量矿物明矾石的单矿物谱。西藏羊应乡热泉地区的岩心经处理后得到的粘粒,用计算机差谱技术进行多次剥离,得到一系列差减光谱,经确定,其矿物相为高岭石、蒙脱石、伊利石、石英、钠长石和微斜长石。

THE COMPUTER DIFFERENCE TECHNICS IN THE RESEARCH OF MINERAL IR SPECTROSCOPY

SDIFF program oi the PE 983 IR spectrophotometer with a 3600 data station was used to obtain the difference of two spectra, and to get a better result than that by the ordinary method. The difference factor can be selected manually or automatically by a step of 0.0002.The character and technique of IR spectral differentiation are introduced by two examples from China. A pure spectrum of alunite has been obtained by the subtraction of chalcedony spectrum from a specimen from Tengchung area, Yunnan Province. By multiple spectrum subtraction, six minerals, kaoli-nite montmorillonite, illite, quartz, albite and a little mierocline were identified in a specimen collected from the hot-spring area in Yangying District, Tibet.