Baseline Correction BLC

The BLC performs several different types of baseline leveling operations on a spectrum two-point level, multipoint level, function fit, interactive polynomial, or auto level. These five methods are capable of baseline correcting a wide variety of data. Note that in the two-point level and the multipoint level methods, the baseline is leveled at a value that is the average of the baseline points. This allows the methods to be applied to both transmission and absorbance spectra. For the interpretation of both nonpolarized and polarized IR spectra, the two-point and the multipoint methods are usually used. 

FIGURE 2.11 Two-point BLC of the IR spectrum of liquid crystal MLC-6815. The procedure is performed by the GRAMS AI/7.01 software. 

The interpretation of the nonpolarized and polarized infrared spectra includes determination of the position (v) and integral absorbancy (Aj) for each j-peak by FSD and CFP at a 50 50 ratio of Lorentzian to Gaussian peak functions. Usually, the factor varies between 0.00013 and 0.00008 (in the CS-NLC case 1.2.10 to 2.3.10 ) and 2000 iterations [76]. The means of two treatments were compared by the Student s t-test. 

The presented determinations are the results of the following equations, definite for i-band with V (/ = 1... n)  

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