Abstract
Because of discrepancies between measured and calculated baselines in a recent experiment, an evaluation of a published technique to locate 100 per cent transmission levels in experimental infrared absorption spectra is presented. The empirical technique in question entails measuring the inflection point slope of an absorption line contour. It is found to be theoretically correct assuming a Lorentz line profile and a triangular scanning function but impractical except for low resolution spectra. Comparison to observed low pressure spectra of the HC1 fundamental vibration-rotation band is made and an alternate, less empirical approach to the slope technique is given.
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