Elastic and electron-capture processes in H++C2H4 collisions below the 10-keV regime -: art. no. 032710

Electron capture and direct elastic scattering in collisions of H+ ions with C2H4 molecules are studied by using a molecular representation within a semiclassical as well as a fully quantum-mechanical approachs below 10 keV. Calculations are carried out at three different molecular configurations, in which H+ approaches (i) parallel and (ii) perpendicular to the C=C axis in the molecular plane, and (iii) perpendicular to this plane. We find that electron capture in the (iii) configuration takes place preferentially over that in the (i) and (ii) configurations at scattering angles above 15 degrees, while the results for (i) and (ii) are comparable in magnitude below 10 degrees, although (ii) dominates slightly at still smaller angles. Total capture cross sections for the (iii) and (ii) configurations differ by a factor of 4 above 500 eV, while those for (i) lie between these values. Below 500 eV, the results for (i) and (iii) are similar in magnitude, while that for the (ii) configuration sharply decreases.