LeHavreV1, Main, Exploration, bibRecord, 000037

State-to-State Inelastic Scattering of O2 with Helium.

Identifieur interne : 000037 ( Main/Exploration ); précédent : 000036; suivant : 000038

State-to-State Inelastic Scattering of O2 with Helium.

Auteurs : Chandan Kumar Bishwakarma [Pays-Bas] ; George Van Oevelen [Pays-Bas] ; Roy Scheidsbach [Pays-Bas] ; David H. Parker [Pays-Bas] ; Yulia Kalugina [Russie] ; François Lique [France]

Source :

The journal of physical chemistry. A [ 1520-5215 ] ; 2016.

RBID : pubmed:26829188

Abstract

Molecular oxygen (O2) is extremely important for a wide variety of processes on and outside Earth. Indeed, O2–He collisions are crucial to model O2 abundance in space or to create ultracold O2 molecules. A crossed molecular beam experiment to probe rotational excitation of O2 due to helium collisions at energies of 660 cm–1 is reported. Velocity map imaging was combined with state-selective detection of O2(X3Σg–) by (2+1) resonance-enhanced multiphoton ionization. The obtained raw O2+ images were corrected from density to flux and the differential cross sections (DCS) were then extracted for six O2 final states. Exact quantum mechanical calculations were also performed. A very good agreement between experimental and theoretical DCSs was found by using an initial O2 beam population ratio of 80% for the first rotational state and 20% for the first excited state. The agreement demonstrates our ability to model inelastic processes between O2 molecules and rare gas both theoretically and experimentally.

DOI: 10.1021/acs.jpca.6b00817
PubMed: 26829188

Affiliations:

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<front><div type="abstract" xml:lang="en">Molecular oxygen (O2) is extremely important for a wide variety of processes on and outside Earth. Indeed, O2–He collisions are crucial to model O2 abundance in space or to create ultracold O2 molecules. A crossed molecular beam experiment to probe rotational excitation of O2 due to helium collisions at energies of 660 cm–1 is reported. Velocity map imaging was combined with state-selective detection of O2(X3Σg–) by (2+1) resonance-enhanced multiphoton ionization. The obtained raw O2+ images were corrected from density to flux and the differential cross sections (DCS) were then extracted for six O2 final states. Exact quantum mechanical calculations were also performed. A very good agreement between experimental and theoretical DCSs was found by using an initial O2 beam population ratio of 80% for the first rotational state and 20% for the first excited state. The agreement demonstrates our ability to model inelastic processes between O2 molecules and rare gas both theoretically and experimentally.</div>
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State-to-State Inelastic Scattering of O2 with Helium.

State-to-State Inelastic Scattering of O2 with Helium.

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Abstract

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