Raman Mapping Using Advanced Line-Scanning Systems: Geological Applications
Raman Mapping Using Advanced Line-Scanning Systems: Geological Applications
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DOI：
10.1366/000370208786401581
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发表时间：
2008-11-01
影响因子：
3.5
通讯作者：
Benzerara, Karim
中科院分区：
文献类型：
--
作者：
Bernard, Sylvain;Beyssac, Olivier;Benzerara, Karim
拉曼成像允许非均质样品以微米空间分辨率进行非破坏性化学和结构成像，从而提供了评估地质样品中矿物和有机相的空间分布的独特能力。最近开发的线扫描拉曼映射技术已经使得有可能在大的、毫米大小的感兴趣区域上获得拉曼映射，这是由于数据采集时间的急剧减少而不损失空间或光谱分辨率。电荷耦合器件（CCD）测量与x，y电动载物台位移的同步使得动态线扫描拉曼映射更加高效：与逐点映射相比，总采集时间可以减少100倍以上。使用两个化学和纹理复杂的地质样品，化石大孢子在变质岩和文石石榴石共生榴辉岩大理石，我们在这里比较两个最近版本的线扫描拉曼映射系统，并讨论各自的优点和缺点，在采集时间，图像质量，空间和成像分辨率，和信噪比。我们表明，线扫描拉曼映射技术是特别适合于这样的样品，这是地质样品的一般复杂性的代表的表征。
By allowing nondestructive chemical and structural imaging of heterogeneous samples with a micrometer spatial resolution, Raman mapping offers unique capabilities for assessing the spatial distribution of both mineral and organic phases within geological samples. Recently developed line-scanning Raman mapping techniques have made it possible to acquire Raman maps over large, millimeter-sized, zones of interest owing to a drastic decrease of the data acquisition time without losing spatial or spectral resolution. The synchronization of charge-coupled device (CCD) measurements with x,y motorized stage displacement has allowed dynamic line-scanning Raman mapping to be even more efficient: total acquisition time may be reduced by a factor higher than 100 compared to point-by-point mapping. Using two chemically and texturally complex geological samples, a fossil megaspore in a metamorphic rock and aragonite-garnet intergrowths in an Eclogitic marble, we compare here two recent versions of line-scanning Raman mapping systems and discuss their respective advantages and disadvantages in terms of acquisition time, image quality, spatial and imaging resolutions, and signal-to-noise ratio. We show that line-scanning Raman mapping techniques are particularly suitable for the characterization of such samples, which are representative of the general complexity of geological samples.