Fourier-Transform Infrared Linear Dichroism: Stretched Polyethylene as a Solvent in IR Spectroscopy

摘要

The infrared linear dichroism of several dozen symmetrical organic molecules of low polarity has been measured on their solid solutions in stretched polyethylene and stretched perdeuterated polyethylene. Both saturated and unsaturated molecules, ranging in size from triatomics to tetracyclic aromatics, have been used. The orientation factors are dictated primarily by molecular shape, making these simple measurements useful for the determination of absolute polarizations of infrared as well as UV-visible transitions. The potential usefulness of the method for studies of molecular geometry and conformation is emphasized and illustrated on the simple case of aniline.