The Planetary Fourier Spectrometer (PFS)

The Planetary Fourier Spectrometer (PFS):"The principle behind PFS is similar to that behind OMEGA: both instruments will identify complex molecules from the wavelengths the molecules absorb from sunlight and from the infrared radiation (heat) they emit. PFS, however, will take measurements over a wider wavelength range (1.2-45 µm) than OMEGA, which makes it best suited for identifying molecules in the atmosphere." Read more at the Mars Express Instrumentation website.