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Home > Teams > LAsers, Molecules and Environment > Themes > Spectroscopy

Spectroscopy


Alain CAMPARGUE
Samir KASSI
Didier MONDELAIN


Spectroscopy by CRDS of the methane in the near infrared region

The insufficient knowledge of the methane spectrum at low temperature was, during a long time, a major limitation to the spectral data analysis for some planets. On the basis of laboratory spectra recorded using high sensitivity laser techniques; the LAME team has recently managed to build an absorption line list for methane (CH4) in the 1.26-1.71 µm range. The WKMC (Wang Kassi, Mondelain & Campargue) allows simulating the methane spectrum between 80 and 300 K. It is about to become the reference list for planetology applications and it has already been applied with success to Titan, Pluto, Uranus, Saturn and Jupiter.

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Ozone spectroscopy near the dissociation limit (1.26 - 1.71 µm)

Ozone, O3, is a key component of the terrestrial atmosphere. Stratospheric ozone is essential to maintain life at the Earth surface by filtering the UV solar light (between 240 and 320 nm) which is able to destroy the molecular structure of living organisms. This molecule has also an important role in the tropospheric photochemistry as a precursor of the OH radical responsible for the oxidation of many species (alkanes, alkenes, aromatics, carbon monoxide). In addition tropospheric ozone is a greenhouse gas with an indirect effect through its impact on OH which modifies the lifetime of other green house gases like methane.

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