Boreskov Institute of Catalysis, Novosibirsk, Russian Federation.
Appl Spectrosc. 2011 Aug;65(8):918-23. doi: 10.1366/11-06281.
A new method of spectral subtraction for gas-phase Fourier transform infrared (FT-IR) spectra was developed for long-path gas measurements. The method is based on minimization of the length of the spectrum that results from subtracting the spectrum of an individual component of a gas mixture (water, CO(2), etc.) from the experimental spectrum of the mixture. For this purpose a subtraction coefficient (k(min)) is found for which the length of the resulting spectrum is minimized. A mathematical simulation with two Lorentzian absorption bands was conducted and the limits of application for the proposed method were determined. Two experimental examples demonstrate that a successful result could be achieved in the case when the subtrahend spectrum contains a number of narrow absorption bands (such as the spectrum of water vapor).
一种新的用于长程气体傅里叶变换红外（FT-IR）光谱的光谱减法方法被开发出来，用于气相测量。该方法基于从混合物的实验光谱中减去混合气体中单个成分（水、CO2 等）的光谱，使得到的光谱长度最小化。为此，找到一个减法系数（k(min)），使得得到的光谱长度最小化。进行了两个洛伦兹吸收带的数学模拟，并确定了所提出方法的应用限制。两个实验示例表明，当被减数光谱包含多个窄吸收带（如水蒸气的光谱）时，可以获得成功的结果。
