1.仪器基本情况

显微激光共焦拉曼光谱以激光为光源,通过探测拉曼散射信号可以获得分子价键以及材料结构信息,广泛应用于化学、材料和生物等领域。

2.指标及参数

1) 激光光源:532 nm

2) 光谱分辨率:1.3 cm-1

3) 扫描范围:100 cm-1~4000 cm-1

4) 光谱重复性:≤±0.15 cm-1

5) 可实现均匀样品在超高真空环境(2.7×10-10 mbar)的拉曼光谱测量。3.仪器应用材料相结构表面增强拉曼生物分析原位催化反应。

3.应用实例

超高真空激光Raman系统为研究地外物质的真实Raman光谱提供了实验平台。采用532nm半导体连续激光器,激光功率为0.5mW,积分时间10s分别在大气和超高真空下测量橄榄石的Raman光谱,两者在谱线特征上存在明显差异。光谱图中822cm-1、854cm-1来源于硅氧四面体的对称性伸缩振动ν1和反对称性伸缩振动ν3。





橄榄石在大气(上)及真空(下)下的拉曼光谱图


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