Showing papers by "Bobby Antony published in 2015"

Electron induced ionisation of C3 to C6 ethanoates

Abstract: The present article reports the calculation of electron impact total ionisation cross sections for C3 to C6 ethanoates for the energy range from the ionisation threshold of the target to 5000 eV. Spherical complex optical potential and complex scattering potential ionisation contribution methods were employed to calculate the cross sections. The results presented here show a consistent variation with previous measurements and theoretical values, wherever available. The dependence of the isomeric effect on the ionisation cross section was also studied. A plot of the peak of ionisation cross section against the square root of the ratio of polarisability to ionisation potential and with the number of carbon atoms in each target exhibits strong correlations. The polarisabilities of C5 and C6 ethanoates were estimated from the correlation plot.

Electron impact ionization cross sections of atoms

Abstract: In this article, we report the electron impact ionization cross sections for atoms Si, P, S, Sc, Cr, Mn, Co, Zn, Ga, Ge, Nb, Rh, and Cd, having applications in different areas of applied science an...

Electron scattering studies of DMS, DMDS and DMSO homologous series

Abstract: The present paper reports ionisation, elastic and total cross section for the first three members of dimethyl sulphide, dimethyl disulphide and dimethyl sulphoxide family of molecules. The multi-scattering centre spherical complex optical potential formalism is applied for integral elastic and inelastic cross section calculations. From the inelastic part, ionisation cross section is derived using complex scattering potential-ionisation contribution method. The total cross section is then obtained from the sum of elastic and inelastic contributions. A reasonably good agreement is obtained for elastic cross section, wherever comparison is available. The ionisation and total cross section calculation for the complete set of molecules has been performed for the first time.

Electron-scattering studies of carbonyl fluoride

Abstract: The present article reports calculations of total, momentum transfer, differential, excitation, and ionization cross sections for electron scattering from the carbonyl fluoride (${\mathrm{F}}_{2}\mathrm{CO}$) molecule. Total cross sections (TCSs) are presented over an extensive energy range from 0.5 to 5000 eV. The ab initio R-matrix and spherical complex optical potential methods were used to perform low-energy computations and intermediate- to high-energy calculations, respectively. The TCSs computed through these two formalisms are in good agreement in the 24--26 eV energy range. The consistency of the data in this overlapping region has allowed us to predict total cross sections over an extensive energy range. Electronic excitation, momentum transfer, and differential cross sections were also calculated using the $R$-matrix method at low incident energies. In the present study, a low-energy resonance at 3.67 eV was detected with a $^{2}B_{1}$ symmetry, indicating the probability of anion formation by the dissociative electron attachment process and further decay to neutral and negative ion fragments. The total ionization cross section for ${\mathrm{F}}_{2}\mathrm{CO}$ was also evaluated using the complex scattering potential--ionization contribution method and the binary encounter Bethe method up to 5 keV.

Elastic and total cross sections for simple biomolecules in the intermediate energy range

Abstract: The elastic and total cross sections for formaldehyde, acetaldehyde, acetone, 2-butanone and formamide are calculated using the spherical complex optical potential formalism in the intermediate energy range from 50 eV to 10 keV. These cross sections find application to various fields like radiation damage and biological sciences. The present results are compared with the available experimental and theoretical data and are found to give excellent agreement. The elastic cross sections reported for most of the targets in the present energy range are done for the first time. The energy dependence of the contribution of ionization and elastic cross section with respect to the total cross section and the correlation of total cross section with polarizability of the molecules are also studied.

Theoretical and experimental analysis of barrier distribution in nearly ideal Schottky diodes

Abstract: Au/n-Si Schottky diodes with nearly ideal behavior were fabricated. The conduction mechanisms and bias dependent behavior of the prepared device at different temperatures were investigated experimentally hand in hand with theoretical methods. The barrier of the diode follows a Gaussian distribution consistent with thermionic emission model, which is unaffected with applied bias. The temperature dependent non-idealities in barrier height and ideality factor were explained on the basis of Si self-interstitials at the interface that has formed during the fabrication process.