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Featured researches published by T. Banerjee.


Journal of Physics B | 2008

Theoretical and experimental demonstrations of the existence of quadrupole Cooper minima

P. C. Deshmukh; T. Banerjee; Hari R. Varma; Oliver Hemmers; Renaud Guillemin; D. Rolles; A. Wolska; S.-W. Yu; Dennis W. Lindle; W. R. Johnson; S. T. Manson

Calculations and measurements of the Xe 5s and 5p nondipole photoelectron asymmetry parameters are obtained, which present clear evidence of the existence of quadrupole Cooper minima, i.e., minima in quadrupole matrix elements as a function of energy, in the photoionization process. This verifies earlier predictions of quadrupole Cooper minima.


Journal of Physics B | 2006

Resonance-induced deviations of β from 2.0 for rare gas s-subshell photoionization

Scott Burwick Whitfield; Ralf Wehlitz; Hari R. Varma; T. Banerjee; P. C. Deshmukh; Steven T. Manson

We investigate the case of resonance-induced deviations of the angular distribution anisotropy parameter, β, from its nominal value of 2.0 for the Kr 4s-subshell at the 3d → mp(m ≥ 5) excitations and the Xe 5s-subshell in the region of the 4d → mp(m ≥ 6) excitations. We observe small but unmistakable variations of β from 2.0 at these resonances. In the case of Kr the largest deviation from 2.0 is a mere −0.030(6), β4s = 1.970(6), while in Xe it is definitively larger at −0.080(6), β5s = 1.920(6). To understand these results in more detail, we have carried out relativistic random phase and relativistic multi-channel quantum defect calculations. Our theoretical results clearly indicate deviations of β from 2.0 for these photolines in these resonance regions, although the degree of variation is predicted to be larger than what is observed.


Journal of Physics: Conference Series | 2015

Wigner time delay in quadrupole photoionization channels of atomic Hg

Ankur Mandal; Soumyajit Saha; T. Banerjee; P. C. Deshmukh; Anatoli Kheifets; Valeriy Dolmatov; Steven T. Manson

Time delay in quadrupole (E2) channels is studied in atomic Hg using the Relativistic Random Phase Approximation. Interchannel coupling is found to be extremely important and large time delays are found in the region of quadrupole (E2) Cooper minima.


Journal of Physics: Conference Series | 2015

Multiple Cooper minima in ground state E2 photoionization of high Z atoms

T. Banerjee; Ankur Mandal; P. C. Deshmukh; Steven T. Manson

Quadrupole photoionization from valence and intermediate subshells of atomic mercury, radon and radium have been studied in the present work. Multiple Cooper minima in the E2 channels have been found even when only intra-shell inter-channel coupling is included, in contrast with the dipole case in which multiple Cooper minima were found only when inter-shell interchannel coupling was included.


Journal of Physics: Conference Series | 2012

Dipole and Quadrupole Photoionization of Intermediate Subshells of Atomic Mercury

T. Banerjee; Hari R. Varma; P. C. Deshmukh; S. T. Manson

Dipole and quadrupole photoionization parameters for intermediate subshells of mercury have been studied using the relativistic-random-phase-approximation (RRPA). Multiple Cooper minima are observed in 5d quadrupole cross sections, even at the level of intrashell coupling. It has been found that the effect of interchannel coupling is much more significant for dipole photoionization parameters than for quadrupole parameters.


Physical Review A | 2009

Spin-orbit-interaction activated interchannel coupling in dipole and quadrupole photoionization

Sunil Kumar; T. Banerjee; P. C. Deshmukh; Steven T. Manson


Radiation Physics and Chemistry | 2006

Interchannel coupling effects on non-dipole photoionization parameters

P. C. Deshmukh; T. Banerjee; K.P. Sunanda; Hari R. Varma


Bulletin of the American Physical Society | 2011

Location of low-energy zeroes in bound-free quadrupole matrix elements and their systematics in comparison to quantum defects and phase shifts

L.A. LaJohn; R. H. Pratt; Gagan B. Pradhan; T. Banerjee; Hari R. Varma; P. C. Deshmukh; S. T. Manson


Journal of Physics B | 2008

FAST TRACK COMMUNICATION: Theoretical and experimental demonstrations of the existence of quadrupole Cooper minima

P. C. Deshmukh; T. Banerjee; Hari R. Varma; Oliver Hemmers; Renaud Guillemin; Daniel Rolles; A. Wolska; Shengwen Yu; Dennis W. Lindle; W. R. Johnson; Steven T. Manson


Bulletin of the American Physical Society | 2008

Spin-Orbit Activated Interchannel Coupling Effect in Dipole and Quadrupole Photoionization

Sunil Kumar; P.C. Deschmukh; T. Banerjee; S. T. Manson

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P. C. Deshmukh

Indian Institute of Technology Madras

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Hari R. Varma

Indian Institute of Technology Mandi

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S. T. Manson

Georgia State University

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Dennis W. Lindle

Lawrence Berkeley National Laboratory

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Ankur Mandal

Indian Institute of Technology Madras

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Ralf Wehlitz

Synchrotron Radiation Center

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