The principle of operation, the structure, as well as the spectral range of the instrument are the same as those of the Bruker IFS 125spectrometer. The only differences are in the resolution (0.1 cm-1 instead of 0.0019cm-1) and the range of pressure. We have several cells (including a cooled one) at high pressure (up to 200 bar). In such conditions, collisions effects on the spectral profile effects are magnified and therefore more easily quantified. Spectra being very expanded by the pressure, a maximum nominal resolution of 0.1 cm-1 is sufficient.

 

Photo of the vessel for work at high pressures

Absorption spectra by oxygen in the A band region, recorded at room temperature and at different pressures with Bruker IFS66V Fourier transformed spectrometer.