15 cm-1 to 12 000 cm-1 spectral coverage without changing optics: Diamond beam splitter adaptation of an FTIR spectrometer

In order to facilitate IR absorption measurements, we have upgraded our Bruker IFS66v/S Fourier-transform infrared (FTIR) spectrometer. A synthetic diamond beam splitter without compensator plate and UHV diamond viewports was installed. We have also modified the IR detector chamber to allow measurements with 5 different detectors. As a result we can now obtain FT absorption spectra from 12 000 cm-1 to 15 cm-1 with the same sample held under ultrahigh vacuum conditions, simply by switching between appropriate IR detectors. We demonstrate the performance of the upgraded FTIR spectrometer by presenting measurements of matrix isolated fullerene ions and an adhesive
tape.