Debashis Mukherjee
Articles written in Pramana – Journal of Physics
Volume 9 Issue 6 December 1977 pp 545-572 Molecular Physics
An ab-initio derivation of the pi-electron hamiltonian by a nonperturbative open-shell formalism
Debashis Mukherjee Raj Kumar Moitra Atri Mukhopadhyay
A method for generating a pi-electron hamiltonian in an ab-initio manner using the non-perturbative open-shell many-body formalism recently developed by us is presented. The π-hamiltonian thus derived is energy-independent, and is also proved to be spin-independent. A recipe is given with the help of which Goldstone—like matrix-elements of
Volume 12 Issue 3 March 1979 pp 203-225 Quantum Chemistry
On the hierarchy equations of the wave-operator for open-shell systems
Starting with the open-shell analogue of the Gell Mann-Low theorem of many-body perturbation theory, a non-perturbative linear operator equation is derived for the linked part of the wave-operator
Volume 13 Issue 5 November 1979 pp 535-544 Atomic And Molecular Physics
Symmetry-adapted many-body perturbation theory: use of the wave operator matrix elements
Debashis Mukherjee Dipan Bhattacharyya
In this paper we develop a simple method for adapting the closed-shell many-body perturbation theory to an arbitrary point group symmetry taking account of various classes of diagrams exactly to all orders. The method consists in deriving a linear operator equation for the closed-shell wave-operator
Volume 18 Issue 3 March 1982 pp 261-270 Nuclear And Particle Physics
On certain correspondences among various coupled-cluster theories for closed-shell systems
Sourav Pal M Durga Prasad Debashis Mukherjee
In this paper certain correspondences have been shown among various formulations of coupled-cluster theories for many electron closed-shell systems. Specifically it is shown that (i) the energy functional using unitary ansatz of the form exp (
Volume 23 Issue 5 November 1984 pp 651-664 Quantum Mechanics
A hermitian open-shell many-body perturbation theory for treating intruder states
Azizul Haque Debashis Mukherjee
In this paper we have formulated an open-shell many-body perturbation theory (
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