Pradeep Kumar
Articles written in Pramana – Journal of Physics
Volume 44 Issue 6 June 1995 pp 555-562
Collision cross-sections for scattering of electrons from NO molecule
Arvind Kumar Jain Pradeep Kumar A N Tripathi
Electron-NO scattering is investigated in the energy range 2–1000eV by using a parameter-free spherical complex optical potential (SCOP) approach in the fixed nuclei approximation. The real part of the optical potential consists of three potentials namely, the static, the exchange and the polarization. For the imaginary part of the SCOP, we employ a semi-empirical model absorption potential. The molecular charge density function is calculated from a single-configuration molecular orbital based on Slater type orbitals. The various potential terms are then determined from these charge density functions. Calculations of the elastic (with and without absorption effects), total absorption, momentum transfer and differential cross-sections are obtained and compared with the available theoretical results and experimental measurements.
Volume 74 Issue 1 January 2010 pp 49-55 Research Articles
Potential energy curves for neutral and multiply charged carbon monoxide
Potential energy curves of various electronic states of CO$^{n+}$ ($0 \leq n \leq 6$) are generated at MRCI/CASSCF level using cc-pvQZ basis set and the results are compared with available experimental and theoretical data.
Volume 74 Issue 2 February 2010 pp 281-291 Research Articles
Pradeep Kumar Surajit Saha C R Serrao A K Sood C N R Rao
We have measured near normal incidence far-infrared (FIR) reflectivity spectra of a single crystal of TbMnO3 from 10 K to 300 K in the spectral range of 50 cm-1 –700 cm-1. Fifteen transverse optic (TO) and longitudinal optic (LO) modes are identified in the imaginary part of the dielectric function $\varepsilon_{2} (\omega)$ and energy loss function Im($−1/\varepsilon(\omega))$, respectively. Some of the observed phonon modes show anomalous softening below the magnetic transition temperature $T_{N}$ ($\sim 46$ K). We attribute this anomalous softening to the spin-phonon coupling caused by phonon modulation of the superexchange integral between the Mn3+ spins. The effective charge of oxygen ($Z_{O}$) calculated using the measured LO–TO splitting increases below $T_{N}$.
Volume 80 Issue 5 May 2013 pp 855-871
Beam lifetime measurement and analysis in Indus-2 electron storage ring
Pradeep Kumar A D Ghodke Gurnam Singh
In this paper, the beam lifetime measurement and its theoretical analysis are presented using measured vacuum pressure and applied radio frequency (
Volume 97, 2023
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