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Fragmentation of methane molecules by proton and antiproton impact

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Abstract

Proton and antiproton collisions with methane molecules have been investigated in the impact energy range of 20–5000 keV. To address the multi-centre nature of the system, a spectral representation of the molecular Hamiltonian is used in conjunction with the independent electron model. The initially populated molecular orbitals are expanded in terms of a single-centred basis and the two-centre basis generator method is employed to solve the time-dependent single-electron Schrödinger equations. The single-electron solutions are complemented with a dynamical decay-route fragmentation model based on fixed branching ratios from [H. Luna, E.G. Cavalcanti, J. Nickles, G.M. Sigaud, E.C. Montenegro, J. Phys. B 36, 4717 (2003)] to obtain the cross sections for the production of CH4 +, CH3 +, CH2 +, CH+ and C+ fragments. In the case of proton impact the calculations underestimate the measurements for CH4 + and CH3 +, while good agreement is observed for the other fragments. A better consistency is found for antiprotons, particularly, for the production of CH4 +, CH2 + and CH+.

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Authors and Affiliations

  1. Department of Physics and Astronomy, York University, Toronto, Ontario, M3J 1P3, Canada

    Arash Salehzadeh & Tom Kirchner

Authors
  1. Arash Salehzadeh
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  2. Tom Kirchner
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Correspondence to Tom Kirchner.

Additional information

Contribution to the Topical Issue “Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces”, edited by A.N. Grum-Grzhimailo, E.V. Gryzlova, Yu V. Popov, and A.V. Solov’yov.

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Salehzadeh, A., Kirchner, T. Fragmentation of methane molecules by proton and antiproton impact. Eur. Phys. J. D 71, 66 (2017). https://doi.org/10.1140/epjd/e2017-70714-9

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  • DOI: https://doi.org/10.1140/epjd/e2017-70714-9

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