红外杂化单光束谱的性质

同一样品不同厚度(b₁和b₂)的两单光束谱ø_b1和ø_b2经线性组合得到杂化单光束谱ø_α=αø_b1+(1-α)ø_b2=αø₀e-Kb₁+(1-α)ø₀e-Kb₂，α为杂化系数。通过改变杂化系数α，就可获得任意强度的杂化谱ø_α。系统研究了杂化光谱ø_α的性质。研究表明，只要控制合适的条件，则厚度为(b₂-αb₂+αb₁)的真实样品的单光束谱ø_b(b=b₂-αb₂+αb₁)与杂化谱ø_α高度相似，ø_α的失真程度可忽略不计。也就是说，厚度在b₁～b₂间任一厚度b的真实样品的单光束谱都可用杂化谱ø_α来表达，ø_α≈ø_b。因此，不需制备厚度为b的样品，通过改变杂化系数α就可获得研究者所希望强度的单光束谱ø_b。杂化谱方法有望在扣除背景干扰等方面得到广泛应用。

The Properties of an Infrared Hybrid Single Beam Spectrum

A hybrid single beam spectrum α=αb1+(1-α)b2=α0e-Kb1+(1-α)0e-Kb2 is introduced as the combin ation of two single beam spectra b1 and b2 from the same sample but with different pathlengths (b1 and b2),where α(0<α<1) is the hybrid coefficient.The intensity of hybrid spectrum α can be controlled easily to the desired point by simply choosing an appropr iate α.The experimental results showed that hybrid spectrum α is very nearly identical to b=0e-K(b2-αb2+αbb) und er appropriate conditions,namely α≈b,where b is the si ngle beam spectrum of the real sample with the pathlength of b2-αb2+αb1.Therefore,the desired single beam spectrum b can be obtained eas ily by choosing α and we no longer need to prepare IR sample with the thick ness of b.Hybrid spectrum method shows valuable potential in application o f eliminating background interference.