Measurements of positron-methane differential scattering cross sections
| Autor: | Steven J. Smith, C. K. Kwan, W. E. Kauppila, T. S. Stein, D. A. Przybyla |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Physical Review A. 55:4244-4247 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.55.4244 |
| Popis: | Relative differential cross sections (DCS's) have been measured for 4 to 200 eV ${\mathrm{e}}^{+}$-${\mathrm{CH}}_{4}$ quasielastic scattering (elastic scattering plus rotational and vibrational excitations) from 30\ifmmode^\circ\else\textdegree\fi{} to 135\ifmmode^\circ\else\textdegree\fi{} in a crossed-beam experiment. The observed DCS behavior, including diffraction effects at low energies, is very similar to that found earlier for ${\mathrm{e}}^{+}$-Ar elastic scattering. Comparisons between (${\mathrm{e}}^{+}$,${\mathrm{e}}^{\mathrm{\ensuremath{-}}}$)-(${\mathrm{CH}}_{4}$,Ar) DCS measurements suggest that observed diffraction effects may be correlated with the sign of the net interaction potential and the degree of spherical symmetry of the target. |
| Databáze: | OpenAIRE |
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