It is quite well known that an absorption spectrum, either recorded or point-point measured, is usually represented graphically as a percentage transmission or absorption vs wavenumber or wavelength. For such an absorption band, the baseline is carefully selected. Usually, it is tangential
to the band wings and the different values of T0 and T (where T0 and T are the apparent incident and transmitted intensities corrected for background at different wavenumbers or wavelengths) are thus measured from it. Hence, all absorbance-wavenumber
or wavelength-derived bands can be illustrated graphically, from which the different apparent bandwidth parameters Δv½a, Δva¾, and Δv¼a measured at ½, ¾,
and ¼ the maximum absorption can be directly estimated.
Medical Research Institute, Physics Department, Alexandria, U.A.R.
Publication date: March 1, 1968
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