Ramendu Bhattacharjee
Articles written in Pramana – Journal of Physics
Volume 63 Issue 5 November 2004 pp 1073-1082
Resonance Raman study on distorted symmetry of porphyrin in nickel octaethyl porphyrin
S Tewari R Das A Chakraborty Ramendu Bhattacharjee
The resonance Raman (RR) spectra of nickel octaethyl porphyrin, Ni(OEP), in CH_{2}Cl_{2} (solvent) at different excitations such as 514.5, 488.0, 441.6 and 406.7 nm are recorded and analysed. The results of the theory of distortion-induced RR intensity is applied to the observed spectra to determine the excited electronic state symmetry of porphyrin in Ni(OEP). It is concluded that the porphyrin molecule (D_{4h} structure) attains a non-polar distorted structure of D_{2} symmetry rather than S_{4} symmetry in CH_{2}Cl_{2} solution.
Volume 71 Issue 3 September 2008 pp 439-445 Research Articles
Vibrational spectroscopy of SnBr_{4} and CCl_{4} using Lie algebraic approach
Joydeep Choudhury Srinivasa Rao Karmuri Nirmal Kumar Sarkar Ramendu Bhattacharjee
The stretching and bending vibrational energies of SnBr_{4} and CCl_{4} are calculated in the one-dimensional framework. The dynamical symmetry group of tetrahedral molecule was taken into consideration to construct the model Hamiltonian in this frame-work. Casimir and Majorana invariant operators were also determined accordingly. Using the model Hamiltonian so constructed, we reported the vibrational energy levels of SnBr_{4} and CCl_{4} molecules accurately.
Volume 72 Issue 3 March 2009 pp 517-525 Research Articles
Vibrational spectra of nickel metalloporphyrins: An algebraic approach
Srinivasa Rao Karumuri Joydeep Choudhury Nirmal Kumar Sarkar Ramendu Bhattacharjee
One of the most interesting areas of current research in molecular physics is the study of the vibrationally excitated states of medium and large molecules. In view of the considerable amount of experimental activity in this area, one needs theoretical models within which to interpret experimental data. Using Lie algebraic method, the vibrational energy levels of nickel metalloporphyrins like Ni(OEP), Ni porphyrin and Ni(TPP) are calculated for 16 vibrational modes. The algebraic Hamiltonian $H = E_{0} + \sum_{i=1}^{n} A_{i}C_{i} + \sum_{i < j} A_{ij}C_{ij} + \sum_{i < j}^{n} \lambda_{ij}M_{ij}$, where $A_{i}$, $A_{ij}$ and $\lambda_{ij}$ are the algebraic parameters which vary from molecule to molecule and $C_{i}$, $C_{ij}$ and $M_{ij}$ are algebraic operators. The vibrational energy levels are calculated using algebraic model Hamiltonian and the results are compared with the experimental values. The results obtained by this model are very accurate.
Volume 73 Issue 5 November 2009 pp 881-887
Vibrational spectrum of CF_{4} isotopes in an algebraic model
Joydeep Choudhury Srinivasa Rao Karumuri Nirmal Kumar Sarkar Ramendu Bhattacharjee
n this paper the stretching vibrational modes of CF_{4} isotopes are calculated up to first overtone using the one-dimensional vibron model for the first time. The model Hamiltonian so constructed seems to describe the C–F stretching modes accurately using a relatively small set of well-defined parameters.
Volume 74 Issue 1 January 2010 pp 57-66 Research Articles
Srinivasa Rao Karumuri Joydeep Choudhury Nirmal Kumar Sarkar Ramendu Bhattacharjee
Using Lie algebraic techniques and simpler expressions of the matrix elements of Majorana and Casimir operators given by us, we obtain an effective Hamiltonian operator which conveniently describes stretching vibrations of biomolecules. For a copper tetramesityl porphyrin molecule, the higher excited vibrational levels are calculated by applying the $U (2)$ algebraic approach.
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