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6 July 2000 Investigation of thin films using Fourier-transform infrared emission spectroscopy
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New possibilities of the FT-IR technique in situ studying of the vibrational relaxation processes occurring in the chromophores during the optical excitation have been successfully performed. The major advantage of this method lies in the ability to obtain in situ vibrational spectroscopic information under normal conditions. The IR- emission spectra of the thin film as well as a diluted solution of rhodamine 6G (Rh6G) are presented for illustration. It was shown that the infrared radiation in main part was due to the transitions within the vibrational manifold of the ground electronic state. Evidence was obtained that the vibration structure of the Rh6G molecule was altered upon optical excitation. The high sensitivity and nondestructive character of FT-IR emission spectroscopy enable advantageous use in other systems, including biomembrane and biological macromolecules.
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Eugeni L. Terpugov and Olga V. Degtyareva "Investigation of thin films using Fourier-transform infrared emission spectroscopy", Proc. SPIE 4129, Subsurface Sensing Technologies and Applications II, (6 July 2000);

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