Articles written in Pramana – Journal of Physics
Volume 7 Issue 1 July 1976 pp 56-61 Optics And Spectroscopy
The differential cross section for the electron scattering accompanied by simultaneous absorption or emisson of one Raman photon and the inverse bremsstrahlung process in an intense laser beam is calculated.
Volume 21 Issue 2 August 1983 pp 89-102 Quantum Mechanics
A new approach to charge-particle scattering in the presence of laser plus coulomb-field by using Fourier analysis technique is described. Explicit expressions for positive energy states and their asymptotic limits for the zero, one and two photon processes are evaluated exactly.
Volume 26 Issue 5 May 1986 pp 427-433 Molecular Physics
A non-perturbative approach for the study of the interaction of a hydroxyl (OH) radical with infra-red radiation is presented. The dressed states and vibrational transition probability of OH radical are defined by a quasi-energy approach (non-perturbative).
Volume 32 Issue 3 March 1989 pp 241-249 Molecular Physics
An approximate method for the vibration-vibration (V-V) energy transfer process during collinear collisions of two HF molecules involving low-lying states in the presence of infrared laser beam using a quasi-energy approach (non-perturbative) is presented. The effect of radiation on V-V process is investigated by changing the laser field detuning and power for various values of collision velocities.
Volume 34 Issue 2 February 1990 pp 117-122
Non-perturbative Floquet method is used to investigate the interaction of strong linearly polarized light with He-atom. In the calculations, six lowest singlet target states and fifteen photon states are taken for absolute convergence. For allowed transitions, accurate oscillator strengths using configuration interaction wave-functions are used. A number of interesting features such as nonlinear effects at high intensities, line broadening, a dynamic Stark effect are obtained and explained.
Volume 40 Issue 6 June 1993 pp 485-501 Research Articles
Collision strengths have been calculated for electron impact excitation of neon-like Fe XVII for all transitions within its 15 lowest states. Configuration interaction wavefunctions have been used to represent the target states. The standard
Volume 41 Issue 4 October 1993 pp 371-388
Collision strengths for all the transitions between the 15 lowest states of neon-like Ni XIX have been calculated for electron impact in the 80–140 Ry energy range. Configuration-interaction wavefunctions have been used to represent the target states. The standard
Volume 53 Issue 4 October 1999 pp 733-741 Research Articles
Volume 53 Issue 5 November 1999 pp 863-867 Research Articles
Effect of laser pulse in suppressing the dissociation of a molecule is shown. The time dependent Schrödinger is solved numerically for a molecule in an intense laser pulse whose uppermost state is connected to continuum.
Volume 58 Issue 4 April 2002 pp 639-646 Research Articles
The close coupling
Volume 62 Issue 1 January 2004 pp 31-36
The ionization of real hydrogen atom is studied under the action of a two-color pulsed laser field of duration 2.12 fs consisting of a fundamental frequency
Volume 64 Issue 1 January 2005 pp 129-134
Collision strength for the transition within the first five fine-structure levels in Ni XIX are calculated using the Breit-Pauli
Volume 65 Issue 1 July 2005 pp 75-84
We have done relativistic calculations for the evaluation of energy levels, oscillator strengths, transition probabilities and lifetimes for Cr VIII ion. Use has been made of configuration interaction technique by including Briet-Pauli approximation. The energies of various levels from the ground state to excited levels of 3s3p6, 3s23p43d, 3s23p44s, 3s23p44d of Cr VIII are given in LSJ coupling scheme after fine-tuning and are compared with the experimental results compiled in the NIST Data Base. Many new lines have been predicted which have not appeared so far in the NIST Data.
Volume 82 Issue 6 June 2014 pp 1061-1074 Research Articles
Nonlinear Mach–Zehnder interferometer (NMZI) created with photonic crystal waveguides (PCW) and with Kerr-type nonlinearity has been investigated in this paper. The NMZI has been simulated using two-dimensional finite difference time domain (2D-FDTD) method. Input verses output (I/O) characteristics have been obtained for different lengths of the nonlinear arm, nonlinear coefficients of the nonlinear arm, wavelengths of the input beam, sizes of defect rods and NMZI offset. The results obtained are compared with earlier published results of NMZI created with conventional step index waveguides (SIW). It is shown that all useful features of light switching offered by SIW-based NMZIs are also possible with PCW-based NMZIs of extremely small dimensions. Moreover, PCW-based NMZIs offer additional useful feature not available with SIW-based NMZIs.
Volume 95, 2021
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