Elastic scattering and rotational excitation of Li2 by positron impact
| Autor: | F. Arretche, Marcos V. Barp, Eliton Popovicz Seidel, Wagner Tenfen |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Elastic scattering
Physics Range (particle radiation) Radiation Scattering Ab initio 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Method of continued fractions Molecular physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Positron Polarizability 0103 physical sciences Physical and Theoretical Chemistry 010306 general physics 0210 nano-technology Spectroscopy Excitation |
| Zdroj: | Journal of Electron Spectroscopy and Related Phenomena. 227:9-14 |
| ISSN: | 0368-2048 |
| DOI: | 10.1016/j.elspec.2018.06.001 |
| Popis: | We report an ab initio and model potential investigation of elastic and rotational excitation cross sections for positron impact with Li2 molecule in the energy range from 0.1 to 10.0 eV. The ab initio cross sections were calculated with the Schwinger Multichannel Method, while the model potential calculations were performed with the Method of Continued Fractions, applying the correlation–polarization interaction known as PCOP. The converged elastic cross sections suggest a spherical polarizability for Li2 between 150 and 160 a 0 3 , a value considerably lower than the experimental one (≈216 a 0 3 ). Rotational excitation cross sections obtained corroborate previous results available, with some discrepancy for the quadrupolar transition for energies below 3 eV. Our results indicate that such divergence comes from the consideration of a correlation-potential properly designed to treat positron-molecule scattering. |
| Databáze: | OpenAIRE |
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