Electron impact ionization cross-section of C₂, C₃, Si₂, Si₃, SiC, SiC₂and Si₂C

Abstract

molecules have been calculated by electron impact. Spherical complex optical potential formalism has been employed for obtaining the inelastic crosssections 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 C 2 and C 3 .

Electron scattering studies of DMS, DMDS and DMSO homologous series

“…The lack of cross section data on such important target species has encouraged us to perform present calculations. The multi-scattering centre spherical complex optical potential (MSCOP) formalism [11][12][13][14][15][16][17] is employed for computing elastic and inelastic cross section, and complex scattering potentialionisation contribution (CSP-ic) method [14][15][16][17] is used to perform the computations for the ionisation cross sections. The next section elucidates the salient features of the theoretical methodology employed for the present computations.…”

“…The next section elucidates the salient features of the theoretical methodology employed for the present computations. Theoretical methodology MSCOP formalism [11][12][13][14][15][16][17] is employed to generate the total inelastic (Q inel ), total elastic and total cross section for these molecules. The single centre approach (SCOP) cannot be used here since the target molecules studied here are very large.…”

“…Figure 1 shows the structure of targets under the subject of present investigation. A semi-empirical approach called the CSP-ic method [14][15][16][17] is then used to derive Q ion from the calculated Q inel . To calculate the elastic and inelastic cross sections, the entire molecule is considered to be composed of independent multiple scatterers.…”

“…Different scattering centres are selected based on the molecular properties such as atomic radii, bond length and the extent of electronic charge cloud of each group in the molecule. This is the principle behind the MSCOP method [11][12][13][14][15][16][17].…”

“…However, the two-term representation of f(U) given in Equation (12) the three boundary conditions as given in Equation (11) are used. Equations (9)-(12) define the present CSP-ic approach [14][15][16][17]. Table 1 lists the target parameters used in the present calculations.…”