Abstract
Abstract An important property of an organic film is its absorption spectrum. However, because of the short optical path length in a thin film, only very strong electronic transitions can be measured by standard spectrometric techniques. With the sensitive photothermal deflection approach it is possible to measure the absorption from transitions which can be as much as four orders of magnitude weaker than the main electronic transitions. We have applied photothermal deflection spectroscopy to a variety of organic thin films with the thickness ranging from sub-micron to hundreds of microns. Several small molecule and polymer binding matrix systems have been studied. Some results are presented and compared with standard UV-Vis spectra.
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