9 citations · 29 across the 13 of their papers we have counts for
5 papers · 2 filters
Random Phase Approximation For allowed and Parity Non-conserving Electric Dipole Transition Amplitudes and its connection with Many-Body Perturbation Theory and Coupled Cluster Theory
Geetha Gopakumar, Chiranjib Sur, Bhanu Pratap Das +3
The connections between the Random Phase Approximation (RPA) and Many-Body Perturbation Theory (MBPT) and its all order generalisation, the Coupled- Cluster Theory (CCT) have been…
Relativistic and correlation effects in atoms
B. P. Das, K. V. P. Latha, Bijaya K. Sahoo +3
This review article deals with some case studies of relativistic and correlation effects in atomic systems. After a brief introduction to relativistic many-electron theory, a numbe…
Electric quadrupole moment of the state in and its role in an optical frequency standard
Chiranjib Sur, K. V. P. Latha, Rajat K. Chaudhuri +2
The electric quadrupole moment for the state of , one of the most important candidates for an optical clock, has been calculated using the relati…
Case studies of atomic properties using coupled-cluster and unitary coupled-cluster methods
Chiranjib Sur, Rajat K. Chaudhuri, B. P. Das +1
The magnetic dipole and electric quadrupole hyperfine constants of Aluminium () atom are computed using the relativistic coupled cluster (CC) and unitary coupled cluster (…
Relativistic unitary coupled cluster theory and applications
Chiranjib Sur, Rajat K Chaudhuri, Bijaya K. Sahoo +2
We present the first formulation and application of relativistic unitary coupled cluster theory to atomic properties. The remarkable features of this theory are highlighted, and it…