Among varies research techniques of the thin film, spectroscopy methods are frequently used, especially the light absorption spectrum, the Raman spectrum, and etc.
而在各种对功能超薄膜的研究技术中，光吸收，拉曼等光谱学方法是最常见的分析手段。
Photoacoustic detection of trace concentrations of gases is one of the most sensitive techniques of infrared Absorption spectroscopy.
光声光谱法是基于红外吸收光谱原理的一种高灵敏度的微量气体探测技术。
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