The total ionisation cross section and the large angle differential cross section for the system He(21S, 23S) + Ar,N2 |
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| Affiliation: | 1. College of Materials and Environmental Engineering, Hangzhou dianzi University, Xiasha University Park, Hangzhou, Zhejiang 310018, China;2. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China;1. Research Group PLASMANT, Department of Chemistry, University of Antwerp, Universiteitsplein 1, Wilrijk B-2610, Belgium;2. Research Group LADCA, Department of Chemistry, University of Antwerp, Universiteitsplein 1, Wilrijk B-2610, Belgium;1. Research group PLASMANT, Department of Chemistry, University of Antwerp, Universiteitsplein 1, BE-2610 Wilrijk-Antwerp, Belgium;2. National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan;1. Research group PLASMANT, Department of Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk-Antwerp, Belgium;2. Department of Electrical Engineering and Electronics, University of Liverpool, Brownlow Hill, Liverpool L69 3GJ, United Kingdom;1. Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa. Av. Rovisco Pais, 1049-001 Lisboa, Portugal;2. Sorbonne Universités, UPMC Univ. Paris 06, UMR 7190, Institut Jean le Rond d''Alembert, F-75005, Paris, France;3. Laboratoire Catalyse et Spectrochimie, UMR 6506, CNRS-ENSICAEN, Université de Caen, 6, boulevard du Maréchal-Juin, 14050 Caen, France;4. Keele University, Keele, Staffordshire, ST5 5BG, UK;5. CNRS, UMR 7190, Institut Jean le Rond d''Alembert, F-78210, Saint-Cyr l’Ecole, France |
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| Abstract: | We have measured the total ionisation cross section Qion(g) and the large angle differential cross section σ(θ, g) for the system He(21S, 23S)+ Ar, N2 at energies 0.05 < Ec.m. (eV) < 6. This energy range is covered by applying two different discharge sources for the production of metastable atoms. In the atomic beam the He(23S) level is most abundant with relative populations C = 0.91±0.01 and C = 0.96±0.01 for thermal energy range and the superthermal energy range, respectively. A quench lamp is used for the quenching of the (21S) level population. In the thermal energy range, σ(θ, g) and Qion(g) are in fair agreement with experimental results of other authors and with calculated cross sections based on the optical potential given by Siska. In the superthermal energy range, the He(23S)+Ar optical potential is modified to describe our experimental data. The slope of the repulsive branch of the real potential is increased for r < 2.85 Å; in the imaginary potential a saturation to a constant (or even decreasing) value for internuclear distances less than 2.5 Å is introduced. |
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