The gaseous and icy giant planets of our Solar System present an H₂ and He rich atmosphere, whose opacity and composition are widely investigated by both ground-based and spaceborne instruments.

Using an innovative experimental setup, we investigated the Collision-Induced Absorption of H₂ in the IR spectral range, between 4000 and 5500 cm^-1, over a wide temperature range, spanning from 120 to 500 K.

These new data addressed gaps where experimental values were previously missing, revealing interesting spectroscopic details called interference dips, which, to our current knowledge, have been observed by few experimental works, exclusively at or below room temperature.

These new high-resolution measurements can support not only the theoretical modelling of H₂ opacity, but also provide hints for an additional tool for retrieving atmospheric parameters in an atmospheric region otherwise difficult to access, thereby aiding current and future missions.