State-to-State Inelastic Scattering of O2 with Helium
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- 作者：Chandan Kumar Bishwakarma ; George van Oevelen ; Roy Scheidsbach ; David H. Parker ; Yulia Kalugina ; François Lique
- 刊名：Journal of Physical Chemistry A
- 出版年：2016
- 出版时间：February 18, 2016
- 年：2016
- 卷：120
- 期：6
- 页码：868-874
- 全文大小：406K
- ISSN：1520-5215
文摘
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.