E. Le Menn

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We present 1–5 lm IR reflectance spectra of CO2 clathrate hydrates acquired under temperature and pressure conditions representative of the icy moons’ surfaces. The IR reflectance spectrum of the CO2 clathrate hydrates is similar to the water ice IR reflectance spectrum except for two main absorption bands corresponding to the CO2 guest molecule at 2.71 and(More)
Introduction: Titan’s atmosphere is mainly composed of nitrogen (N2, 95 – 98 %) and methane (CH4, 1 – 5%). Both compounds are photodissociated and produce heavier hydrocarbons and nitriles that are able to sediment down to the surface and accumulate over geological timescales [1]. Among all these hydrocarbons, acetylene (C2H2) is one of the most abundantly(More)
Introduction Carbon dioxide has been detected on several icy surfaces of the moons of Jupiter[1], [2] and Saturn[3]. In these environments where the temperature is below 120 K, CO 2 might be either in a solid state mixed with water ices, or trapped in a clathrate hydrate structure. In fact, except for Titan where the pressure is sufficient, clathrate(More)
We have investigated the potential of visible and infrared hyperspectral imagery to characterize a painting dating from the French revolution. Images at increasingly long wavelengths, probing different depths into the painting and sensitive to the different pigments responses, give new insights into the drawings used by the artist. It suggests that the two(More)
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