Abstract
In principle it is apparent that Fourier transform infrared spectroscopy offers a number of significant advantages in the determination of infrared intensities integrated over the rotational fine structure in vibration-rotation bands. One expects that there should be no problem with photometric accuracy; yet, before embarking on a systematic program of study, we believe it important to establish that the method will work in practice. As a test case we have chosen the <i>v</i><sub>2</sub> fundamental of CO<sub>2</sub> at 673 cm<sup>−1</sup> since this is, in our experience, as difficult a band as any when it comes to measuring integrated intensities. We have, using a Digilab FTS-20 spectrometer, determined a value of the integrated intensity, Γ<sub>2</sub> = 7901 ± 105 cm<sup>2</sup>/mol which should be compared with the value previously determined on a dispersive instrument, Γ<sub>2</sub> = 7882 ± 110 cm<sup>2</sup>/mol. We have also determined a value of Γ<sub>3</sub> = 25,300 ± 570 cm<sup>2</sup>/mol for the integrated intensity of the antisymmetric stretching fundamental.
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