title: State-to-State Inelastic Scattering of O2 with Helium.
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.
authors.affiliation: Radboud University Nijmegen , Institute for Molecules and Materials, Heijendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
authors.forename: Chandan Kumar
authors.initials: CK
authors.lastname: Bishwakarma
authors.affiliation: Radboud University Nijmegen , Institute for Molecules and Materials, Heijendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
authors.forename: George
authors.initials: G
authors.lastname: van Oevelen
authors.affiliation: Radboud University Nijmegen , Institute for Molecules and Materials, Heijendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
authors.forename: Roy
authors.initials: R
authors.lastname: Scheidsbach
authors.affiliation: Radboud University Nijmegen , Institute for Molecules and Materials, Heijendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
authors.forename: David H
authors.initials: DH
authors.lastname: Parker
authors.affiliation: Tomsk State University , 36 Lenin av., Tomsk 634050, Russia.|LOMC - UMR 6294, CNRS-Université du Havre , 25 rue Philippe Lebon, BP 1123, 76063 Le Havre, France.
authors.forename: Yulia
authors.initials: Y
authors.lastname: Kalugina
authors.affiliation: LOMC - UMR 6294, CNRS-Université du Havre , 25 rue Philippe Lebon, BP 1123, 76063 Le Havre, France.
authors.forename: François
authors.initials: F
authors.lastname: Lique