Electron impact ionization cross-section of C₂, C₃, Si₂, Si₃, SiC, SiC₂ and Si₂C

Abstract

Total ionization cross-sections for C₂, C₃, Si₂, Si₃, SiC, SiC₂ and Si₂C molecules have been calculated by electron impact. Spherical complex optical potential formalism has been employed for obtaining the inelastic cross-sections for these molecules. Then by applying complex scattering potential-ionization contribution method, total ionization cross-sections are derived. These cross-sections are calculated in the energy range from ionization threshold to 2 keV. There are no measurements available in the literature to the best of our knowledge with which our results can be compared. The results show a linear relationship between maximum ionization cross-section and square root of the ratio of polarizability to ionization potential, depending on its atomicity. This gives a confirmation for the consistency of the data reported here. Present work is a maiden attempt to find electron impact ionization cross-section for these molecules, except for C₂ and C₃.

Keywords:

• ionization cross-section
• complex spherical optical potential
• complex scattering potential-ionization contribution

Acknowledgement

BKA is pleased to acknowledge the support of this research by the Department of Science and Technology (DST), New Delhi through Grant No. SR/FTP/PS-27/2009.