The Planetary LABoratory (PLAB) is a laboratory dedicated to spectroscopy study. We build up an experimental setup to characterized the optical properties of gases under planetary conditions. It's consist of a Fourier Transform InfraRed (FT-IR) interferometer, equipages with four different detectors, two beam splitter and two lamps, MIR and NIR. Combining the detectors, the beam splitters and sources we able to work from 800 to 25000 cm-1 ( from 0.4 to 16 μm) with a resolution from 10 to 0.01 cm-1. A special customized gas cell of about 2 cm of optical path, designed to support pressure up to 350 bar and temperature up to 300 °C has been integrated inside the interferometer. To recreate the same conditions found in the deep atmosphere of Venus, we varied the CO2 pressure and temperature according to a real vertical profile measured by the Venera probes.

FT-IR High Pressure cell
Fig.1: Fourier Transform InfraRed (FT-IR) spectrometer (on left) and the High Pressure-High Temperature (HP-HT) gas cell (on right).