Abstract
The multichannel Raman spectrometry has been used in the study of the isomerization reaction of an 80% cis PA film into a trans PA, using a laser beam for a double purpose. It is employed simultaneously as an activation agent inducing the isomerization reaction and the Raman diffusion. In each experience, the power of the laser beam P i ( λ) was equivalent to the temperature. Twelve spectra have been recorded at different time periods tj = j·d t. The integrations of the Raman intensities related to two selected bands were numerically calculated. We also proposed an original method for the determination of the isomeric composition. A quantitative relationship between the equilibrium temperature and the laser beam power (in the range of laser power: 30 < P i ( λ) < 300 mW) has been found. An estimate number of isomerized molecules N 0 and then a correction factors f cis and f trans were also obtained.
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