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Efficient diffusive mechanisms of O atoms at very low temperatures on surfaces of astrophysical interest

Autor: Congiu, E., Minissale, M., Baouche, S., Chaabouni, H., Moudens, A., Cazaux, S., Manicò, G., Pirronello, V., Dulieu, F.

At the low temperatures of interstellar dust grains, it is well established that surface chemistry proceeds via diffusive mechanisms of H atoms weakly bound (physisorbed) to the surface. Until recently, however, it was unknown whether atoms heavier t

Externí odkaz: http://arxiv.org/abs/1402.5855

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Quantum tunneling of oxygen atoms on very cold surfaces

Autor: Minissale, M., Congiu, E., Baouche, S., Chaabouni, H., Moudens, A., Dulieu, F., Accolla, M., Cazaux, S., Manico, G., Pirronello, V.

Publikováno v: PRL 111, 053201 (2013)

Any evolving system can change of state via thermal mechanisms (hopping a barrier) or via quantum tunneling. Most of the time, efficient classical mechanisms dominate at high temperatures. This is why an increase of the temperature can initiate the c

Externí odkaz: http://arxiv.org/abs/1402.3207

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Sticking coefficient of hydrogen and deuterium on silicates under interstellar conditions

Autor: Chaabouni, H., Bergeron, H., Baouche, S., Dulieu, F., Matar, E., Congiu, E., Gavilan, L., Lemaire, J. L.

Sticking of H and D atoms on interstellar dust grains is the first step in molecular hydrogen formation, which is a key reaction in the InterStellar Medium (ISM). After studying the sticking coefficients of H2 and D2 molecules on amorphous silicate s

Externí odkaz: http://arxiv.org/abs/1202.2473

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