State-to-State Inelastic Scattering of O2 with Helium

The Journal of Physical Chemistry. a
Chandan Kumar BishwakarmaFrançois Lique

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.

References

Aug 24, 2000·Accounts of Chemical Research·D H Parker
Mar 8, 2013·The Review of Scientific Instruments·B YanD H Parker
Mar 22, 2013·The Journal of Chemical Physics·M BrouardS Stolte
Oct 17, 2015·The Journal of Physical Chemistry. a·Lei SongArthur G Suits

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Citations

Jul 10, 2017·The Journal of Chemical Physics·Thomas F M LuxfordMatthew L Costen
Oct 4, 2018·The Journal of Chemical Physics·Chandan Kumar BishwakarmaFrançois Lique
Mar 6, 2021·Physical Chemistry Chemical Physics : PCCP·Cheikh T BopRichard Dawes
Sep 12, 2019·The Journal of Physical Chemistry. a·F GámezS Montero

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