Nighttime chlorine monoxide observations by the Odin satellite and implications for the ClO/Cl2O2 equilibrium

We use measurements of chlorine monoxide (ClO) by the SMR instrument onboard the Odin satellite to study the nighttime thermal equilibrium between ClO and its dimer Cl2O2. Observations performed in the polar vortex during the 2002–2003 Arctic winter showed enhanced amounts of nighttime ClO over a wide range of stratospheric temperatures (185 < T < 225 K). Odin/SMR measurements are here compared to three-dimensional model calculations using various published estimations of the Keq equilibrium constant between ClO and Cl2O2. Our results show that the value of Keq currently recommended by JPL (Sander et al., 2003) leads to a large underestimation of the observed nighttime ClO amounts, and that a realistic estimation of Keq must lie between the values determined by Cox and Hayman (1988) and Von Hobe et al. (2005)

Caractérisation et approche structurale de verres du systeme La2O3–MgO–B2O3

In this paper, a vitreous domain of the ternary system: xLa2O3–yMgO–zB2O3 characterised by X-ray diffraction is shown. Structural approach using vibrational spectroscopy and optical probe is realized for some of these glasses and compared to crystalline LaMgB5O10..

ODIN/SMR measurements during the 2001 Leonid storm

International audienc

ODIN/SMR measurements during the 2001 Leonid storm

International audienc

ODIN/SMR measurements during the 2001 Leonid storm

International audienc

Do meteors affect the molecular content of the atmosphere ? Microwave observations of HCN during the Leonids

International audienc

Radiospectroscopical search for molecule delivery and induced chemistry in the Earth atmosphere during the Leonids meteor shower

International audienc

Radiospectroscopical search for molecule delivery and induced chemistry in the Earth atmosphere during the Leonids meteor shower

International audienc

Radiospectroscopical search for molecule delivery and induced chemistry in the Earth atmosphere during the Leonids meteor shower

International audienc