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Infrared transmittance and reflectance spectroscopy

Infrared spectra are obtained by a Fourier Transform Infrared (FTIR) spectrometer (Bruker Equinox 55). The sample holder has a hole, with a diameter of 4.5 mm, which allows the infrared beam to transmit through the substrate and the sample. The infrared beam forms an angle of 45$^{o}$ with both the ion beam and the substrate holder. Thus, spectra can be taken in-situ before, during, and after irradiation, without tilting the sample. By illuminating the sample with an external light source it is also possible to perform reflectance spectroscopy in the 0.65-2.5 $\mu$m range. Measures in the 0.4-1 $\mu$m spectral range can be obtained with the CCD detector and the Triplemate SPEX spectrometer described below.

Innocenza Busa' 2005-11-14