AN APPROXIMATE METHOD FOR THE CALCULATION OF THE INFRARED MOLAR ABSORPTION-COEFFICIENT AND ABSORPTION INDEX SPECTRA OF LIQUIDS FROM TRANSMISSION MEASUREMENTS
Je. Bertie et Y. Apelblat, AN APPROXIMATE METHOD FOR THE CALCULATION OF THE INFRARED MOLAR ABSORPTION-COEFFICIENT AND ABSORPTION INDEX SPECTRA OF LIQUIDS FROM TRANSMISSION MEASUREMENTS, Mikrochimica acta, 1997, pp. 295-296
A simple and effective approximate method for the calculation of infra
red molar absorption coefficient spectra, E-m(<(nu)over tilde>), and a
bsorption index spectra; k(<(nu)over tilde>), of liquids from transmis
sion measurements is presented. In the approximate method, the apparen
t absorbance due to reflection losses is calculated by assuming the ce
ll is a single window. This simplifies the correction of the experimen
tal absorbance for the contribution of reflection and eliminates the n
eed for an iterative calculation. Although simpler, the method gives k
and E-m values accurate to 1% for all but the strongest infrared abso
rptions. Areas under these spectra are accurate to 0.5%. The method is
demonstrated on a mixture of 90 mole% toluene and 10 mole% chlorobenz
ene.