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研究样品吸收光谱的常规方法是测定样品的透射光谱,而对某些强吸收物质,需用反射光谱,但一般反射光谱的光强度随消光系数的变化不明显。1961年J Fahrenfort提出了衰
The conventional method for studying the absorption spectrum of a sample is to measure the transmission spectrum of the sample. For some strongly absorbing species, the reflection spectrum is required. However, the light intensity of the general reflection spectrum does not change obviously with the extinction coefficient. J Fahrenfort made a decline in 1961