LeHavreV1, Main, Exploration, bibRecord, 000315

The rate of the F + H2 reaction at very low temperatures.

Identifieur interne : 000315 ( Main/Exploration ); précédent : 000314; suivant : 000316

The rate of the F + H2 reaction at very low temperatures.

Auteurs : Meryem Tizniti [France] ; Sébastien D. Le Picard [France] ; François Lique [France] ; Coralie Berteloite [France] ; André Canosa [France] ; Millard H. Alexander [États-Unis] ; Ian R. Sims [France]

Source :

Nature chemistry [ 1755-4349 ] ; 2014.

RBID : pubmed:24451590

English descriptors

KwdEn :
- Cold Temperature, Fluorine (chemistry), Gases (chemistry), Hydrogen (chemistry), Quantum Theory.
MESH :
- chemical , chemistry : Fluorine, Gases, Hydrogen.
- Cold Temperature, Quantum Theory.

Abstract

The prototypical F + H2 → HF + H reaction possesses a substantial energetic barrier (~800 K) and might therefore be expected to slow to a negligible rate at low temperatures. It is, however, the only source of interstellar HF, which has been detected in a wide range of cold (10-100 K) environments. In fact, the reaction does take place efficiently at low temperatures due to quantum-mechanical tunnelling. Rate constant measurements at such temperatures have essentially been limited to fast barrierless reactions, such as those between two radicals. Using uniform supersonic hydrogen flows we can now report direct experimental measurements of the rate of this reaction down to a temperature of 11 K, in remarkable agreement with state-of-the-art quantum reactive scattering calculations. The results will allow a stronger link to be made between observations of interstellar HF and the abundance of the most common interstellar molecule, H2, and hence a more accurate estimation of the total mass of astronomical objects.

Url:

https://hal.archives-ouvertes.fr/hal-00944371

DOI: 10.1038/nchem.1835
PubMed: 24451590

Affiliations:

Le document en format XML

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<author><name sortKey="Berteloite, Coralie" sort="Berteloite, Coralie" uniqKey="Berteloite C" first="Coralie" last="Berteloite">Coralie Berteloite</name>
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<front><div type="abstract" xml:lang="en">The prototypical F + H2 → HF + H reaction possesses a substantial energetic barrier (~800 K) and might therefore be expected to slow to a negligible rate at low temperatures. It is, however, the only source of interstellar HF, which has been detected in a wide range of cold (10-100 K) environments. In fact, the reaction does take place efficiently at low temperatures due to quantum-mechanical tunnelling. Rate constant measurements at such temperatures have essentially been limited to fast barrierless reactions, such as those between two radicals. Using uniform supersonic hydrogen flows we can now report direct experimental measurements of the rate of this reaction down to a temperature of 11 K, in remarkable agreement with state-of-the-art quantum reactive scattering calculations. The results will allow a stronger link to be made between observations of interstellar HF and the abundance of the most common interstellar molecule, H2, and hence a more accurate estimation of the total mass of astronomical objects.</div>
</front>
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<country name="États-Unis"><region name="Maryland"><name sortKey="Alexander, Millard H" sort="Alexander, Millard H" uniqKey="Alexander M" first="Millard H" last="Alexander">Millard H. Alexander</name>
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The rate of the F + H2 reaction at very low temperatures.

The rate of the F + H2 reaction at very low temperatures.

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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Pour générer des pages wiki

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