Knowledge Bank

The infrared reflectance and transmittance of the $\nu 11(a2u)$ fundamental of $C6H6(s)$ for a film 1.26 microns thick have been measured. Optical expressions for thin films given by Heavens$\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ have been used to calculate the refractive index n and the absorption index k. Integration of k over the band gives an absolute intensity $\Gamma =11.7\pm 1.3cm2millimole-1$, which is about 36% lower than the apparent intensity of 15.9. Comparison to results of other workers will be made.