Abstract
We have studied, using infrared spectroscopy, the variation according to temperature of the widths of about ten fundamental vibration bands of furan and thiophene. This experimental investigation allowed us to determinate an approximation of the vibrational widths for each band. Adding to the above, the low frequency results obtained and those yielded by Raman diffusion measurements at room temperature, it has been possible to give a more accurate evaluation of the vibrational and rotational contributions to the widths of the bands. We have deduced the vector and tensor angular correlation times and their comparison has offered an opportunity to work out a model of molecular diffusion showing the motions of thiophene and furan in the liquid phase.
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