### Abstract

Abstract
Different computational methods are employed to evaluate elastic (rotationally summed) integral and differential cross sections for low energy (below about 10 eV) positron scattering off gas-phase C2H2 molecules. The computations are carried out at the static and static-plus-polarization levels for describing the interaction forces and the correlation–polarization contributions are found to be an essential component for the correct description of low-energy cross section behavior. The local model potentials derived from density functional theory (DFT) and from the distributed positron model (DPM) are found to produce very high-quality agreement with existing measurements. On the other hand, the less satisfactory agreement between the R-matrix (RM) results and measured data shows the effects of the slow convergence rate of configuration-interaction (CI) expansion methods with respect to the size of the CI-expansion. To contrast the positron scattering findings, results for el

Original language | English |
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Pages (from-to) | 425-434 |

Journal | Nuclear Instruments and Methods in Physics Research: Section B |

DOIs | |

State | Published - 2008 |

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Franz, J., Gianturco, F. A., Baluja, K. L., Tennyson, J., Carey, R., Montuoro, R., Lucchese, R. R., Stoecklin, T., Nichols, P., & Gibson, T. (2008). Correlation-Polarization Effects in Electron/Positron Scattering from Acetylene: A Comparison of Computational Models.

*Nuclear Instruments and Methods in Physics Research: Section B*, 425-434. https://doi.org/10.1016/j.nimb.2007.12.019