Nonradiative and radiative electron capture in collisions ofHe+ions with C atoms below 1000 eV
| Autor: | Gerhard Hirsch, Alexander Dalgarno, Robert J. Buenker, L. Chantranupong, M. Kimura, Yan Li |
|---|---|
| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | Physical Review A. 49:2541-2544 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.49.2541 |
| Popis: | Nonradiative and radiative electron captures in collisions of ${\mathrm{He}}^{+}$ ions with carbon atoms at energies below 1 keV are studied theoretically by using a molecular-orbital expansion method to calculate the adiabatic potential-energy curves and the nonadiabatic coupling matrix elements of ${\mathrm{CHe}}^{+}$. The corresponding scattering equations are solved. For nonradiative transitions, electron capture into channels separating to He+${\mathrm{C}}^{+}$${(}^{2}$D) are found to be dominant below 10 eV. However, as the energy increases, the channels separating to He+${\mathrm{C}}^{+}$${(}^{2}$P) take over because of the positive asymptotic energy defect. At 100 eV, the nonradiative capture cross section is 5\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}17}$ ${\mathrm{cm}}^{2}$. The radiative electron-capture cross section is found to be very small, with a magnitude nowhere greater than ${10}^{\mathrm{\ensuremath{-}}22}$ ${\mathrm{cm}}^{2}$. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|