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ANIL K. PRADHAN
Professor, Department of Astronomy, Adjunct Professor, Chemical
Physics, The Ohio State University
E-mail: pradhan@astronomy.ohio-state.edu OR pradhan.1@osu.edu, Ph: 614-292-5850, Fax: 614-292-2928
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ATOMIC ASTROPHYSICS AND SPECTROSCOPY
AND
BIOMEDICAL NANOSPECTROSCOPY
Greetings! This homepage reports the research by the OSU Atomic
Astrophysics and Biomedical Group, with senior Research Scientist
Sultana
Nahar and collaborators.
Research interests are theoretical studies of
radiative and collisional atomic processes, and spectral formation in
astrophysical plasmas - an integrated program of atomic physics and astronomy.
New directions in theoretical atomic physics research include a
combination of Relativistic Coupled Cluster Method (RCCM) and the
R-matrix method.
This website will also report on the activties of a new
interdisciplinary COMPUTATIONAL NANOSCIENCE
and BIOMEDICAL NANOSPECTROSCOPY
initiative devoted to spectroscopy of material and biological
nanostrcutures. Researchers in the group
include Max Montenegro (Postdoc, Astronomy), Russell Pitzer (Chemistry),
Yan Yu (Thomas Jefferson University Medical School), Jian
Wang, Li Kaile, Neil Jenkins (OSU Medical Center),
Chiranjib Sur (IBM, India), and Enam Chowdhury (Physics).
The program was supported by a Large Interdisciplinary Grant
Award from the OSU Office of Research, College of Mathematical and Physical
Sciences, and the Department of Astronomy.
Recent developments include a new methodology, RESONANT THERANOSTICS,
based on the use of monochromatic X-ray sources for imaging,
therapy and diagnostics (theranostics) in
cancer research, as reported in the following news item.
*** News Item OSUToday ***
"FROM ASTROPHYSICS TO BIOMEDICINE VIA NANOTECHNOLGY:
A cover-story in Radiation Therapy magazine IMAGE reported on
novel developments in the use of X-rays and nanoparticles
for cancer diagnostics and
therapy by an interdisciplinary group at Ohio State and other
institutions.
The article,
The X-Ray Reloaded: Rearming Radiography with Resonant
Theranostics ,
may be accessed on-line. The collaboration at
OSU is led by Prof. Anil Pradhan (Astronomy and Chemical Physics),
and includes researchers from the
College of Biological and Mathematical and Physical Sciences, and the
OSU Medical Center. The overall multi-disciplinary
effort, theoretical and experimental, involves
atomic and molecular physicists and chemists, astrophysicists, radiation
therapists, and X-ray instrumentalists."
The Opacity Project and the Iron/RmaX Project
The OSU group represents the U.S. participants in the international
Opacity Project (OP) , and the
Iron Project (IP/RmaX) Network aimed at large-scale
atomic calculations using the relativistic R-matrix method for
iron-peak elements and X-ray astrophysics.
The databases
TIPTOPBASE and OPSERVER offer OP and IP atomic data, and on-line
calculation of "customized" astrophysical opacities, at the Ohio Supercomputer
Center in Columbus Ohio.
This homepage is also intended as a guide to recommended
ATOMIC DATA
for astrophysical and laboratory applications. In addition, the database
Nahar OSU
Radiative Data (NORAD) contains a large number of datafiles for
energy levels, transition probabilities, photoionization cross sections,
and total and partial (electron+ion) recombination rate coefficients
(including radiative and dielectronic recombination processes in a
unified and ab initio manner using the R-matrix method).
The radiative data supercede earlier TOPbase data.
Workshop organized by Anil Pradhan and
Sultana Nahar, sponsored by the Institute of
Theoretical Atomic and Molecular Astrophysics (ITAMP) at the Harvard-Smithsonian
Center for Astrophysics, Cambridge (MA), jointly with the Iron Project, in
honor of Michael J. Seaton, Professor Emeritus, University College London, London, UK, for
monumental contributions to atomic physics and astrophysics and as
founder of the Opacity Project, the forerunner of the Iron Project. Mike passed
away in May 2007; his last paper "Updated Opacity Project radiative
accelerations" appeared after his death
in August 2007 (Mon. Not. R. Astron. Soc., 382, 245). Obituary: "Michael
J. Seaton", by Anil Pradhan and Sultana Nahar, Bulletin of American
Astronomical Society, Vol. 39, No. 4, 1081, 2007.
Recent Publications: 2007 -
- ``Multi-Disciplinary Role of Atomic Astrophysics: From Stellar
Interiors to Cancer Research Via Nanotechnology", Anil K.
Pradhan, Sultana N. Nahar, Maximiliano Montenegro, Enam A. Chowdhury,
Kaile Li, Chiranjib Sur, and Yan Yu, in proceedings of the international
conference on
Recent Advances in Spectroscopy: Astrophysical, Theoretical and
Laboratory Perspectives, Jan 28 - 31, 2009, Kodailkanal Observatory,
Indian Institute of Astrophysics, Springer-Verlag (to be published).
- ``Accuracy of Stellar Opacitites and the Solar Abundance Problem",
Anil K. Pradhan and Sultana N. Nahar, in proceedings of the symposium
Recent Directions Astrophysical Quantitative Spectroscopy and Radiation
Hydrodynamics} (in honor of Dimitri Mihalas's 70th birthday), Boulder
Colorado, Mar 30 - Apr 3, 2009, American Institute of Physics (in
press).
- ``Resonant X-Ray Enhancement of the Auger Effect in High-Z atoms,
molecules, and Nanoparticles: Biomedical Applications", Anil K. Pradhan,
Sultana N. Nahar, Maximiliano Montenegro, Yan Yu, Hong Lin Zhang,
Chiranjib Sur, Michael Mrozik, Russell M. Pitzer, Journal of Physical
Chemistry (submitted)
- ``Monte Carlo Simulations and Atomic Calculations for Auger
Processes in Biomedical Nanotheranostics", Maximiliano Montenegro,
Sultana N. Nahar, Anil K. Pradhan, Ke Huang, Yan Yu, Journal of Physical
Chemistry (submitted)
- ``Geant4 Estimation Model of High Z Atom Concentration for Tumor
Vessel Ablation", Ke Huang, Anil Pradhan, Sultana Nahar, Maximiliano
Montenegro, Yan Yu, 31st Annual International IEEE Engineering in
Medicine and Biology Conference, Minneapolis, MN, September 2-6, 2009
(submitted)
- "Electron-Ion Recombination Rate Coefficients and Photoionization
Cross Sections for Astrophysically Abundant Elements. XIV. C-like Fe~XXI
including high-energy resonances", Sultana N. Nahar, J. Quant. Spec.
Rad. Transf. (in press).
- ``A comprehensive Set of UV and X-ray Radiative Transition Rates
for Fe XVI", Sultana N. Nahar, W. Eissner, C. Sur, Anil K. Pradhan, Physica
Scripta, 79, 035401 (2009)
- ``On the importance of satellite lines to the He-like K$\alpha$
complex and the G ratio for calcium, iron, and nickel, Justin Oelgoetz,
Christopher J. Fontes, Hon Lin Zhang, Sultana N. Nahar, Anil K.
Pradhan, Mon. Not. R. Astro. Soc., 394, 742 (2009)
- ``Recombination rate coefficients for KLL dielectronic satellite
lines of Fe XXV and Ni XXVII, S N Nahar, J. Oelgoetz and A K Pradhan,
Physica Scripta, 79, 055301 (2009)
- ``Photoionization cross sections of Fe XXI", Sultana N. Nahar,
J. Quant. Spec. Rad. Transf. 109 (2008) 2417-2426.
- "PHOTOIONIZATION, RECOMBINATION, AND RADIATIVE DECAYS OF ATOMS AND
IONS", Sultana N. Nahar, Proceedings of the Conference on
"New Quests in Stellar
Astrophysics. II. Ultraviolet Properties of Evolved Stellar
Populations", Puerto Vallarta, Mexico on April 16 - 20, 2007 (in press)
- "K-alpha transition probabilities for F-like ions from Neon to
Gold: Ab initio relativistic coupled-cluster calculations", Chiranjib Sur,
Sultana N. Nahar and Anil K. Pradhan, Phys. Rev. A, 77, 1 (2008).
- "Oscillator strengths and radiative
transition rates for K$_{\alpha}$ lines in gold X-ray spectra: 1s-2p
transitions", Sultana N. Nahar, Anil K. Pradhan, and Chiranjib Sur,
J. Quant. Spec. Rad. Transf., 109, 1951 (2008).
- "XMM-Newton observations of the Narrow-Line Seyfert 1 galaxy Mkn
335 in an historical low X-ray flux state", Dirk Grupe, Stefanie
Komossa, Luigi C. Gallo, Andrew C. Fabian, Josefin Larsson, Anil K.
Pradhan, Dawei Xu, Giovanni Miniutti, Astrophys. J., 681, 982 (2008).
- "Breakdown of the quasistatic approximation at high densities and
its effect on the heliumlike K$\alpha$ complex of nickel, iron,
and calcium", Justin Oelgoetz, Christopher J. Fontes, Hong Lin
Zhang, and Anil K. Pradhan, Phys. Rev. A 76, 062504 (2007)
- "Next Generation UV Coronagraph Instrumentation for Solar
Cycle-24", John L. Kohl, Rajmal Jain, Steven R. Cranmer, Larry D.
Gardner, Anil K. Pradhan, John C. Raymond, and Leonard Strachan,
Proceedings of the conference on Challenges For Solar Cycle-24, Physical
Research Laboratory, India, Jan 22-27, 2007
- "High-temperature behaviour of the helium-like
K-alpha G ratio: the effect of improved recombination rate
coefficients for calcium, iron, and nickel", J. Oelgoetz,
C. J. Fontes, H.L. Zhang, M. Montenegro, S.N. Nahar, and A. K. Pradhan,
Mon. Not. R. Astr. Soc. 382, 761 (2007).
- "OPserver: interactive on-line computations of opacities and
radiative accelerations", C. Mendoza, M.J. Seaton, P. Buerger, A.
Bellorin, M. Melendez, J. Gonzalez, L.S. Rodriguez, F. Delahaye, E.
Palacios, A.K. Pradhan and C.J. Zeippen, Mon. Not. R. Astron. Soc. 378,
1031 (2007).
- "Effects of partial triple excitations in atomic coupled cluster
calculations", Chiranjib Sur and Rajat K. Chaudhri, Chem. Phys. Lett.,
442, 150-156 (2007).
- "A relativistic unitary coupled-cluster study of electric
quadrupole
moment and magnetic dipole hyperfine constants of ^199 Hg^+", Chiranjib
Sur
and R. K. Chaudhuri, Phys. Rev. A.
, *76*, 032503 (2007).
- "Relativistic multi-reference Fock-space coupled-cluster
calculation
of the forbidden ^1 S_0 -- ^3 D_1 magnetic-dipole transition in
ytterbium", Chiranjib Sur and R. K. Chaudhuri, Phys. Rev. A.
, *76*, 012509 (2007).
- Branching ratios of radiative
transitions in OVI, Chiranjib Sur and Rajat K. Chaudhuri (J.Phys.B,
40, 4307, 2007.
REVIEW: Self-Consistent R-matrix Approach To
Photoionization And Unified Electron-Ion Recombination ,
Sultana N. Nahar and Anil K. Pradhan, Radiation Physics and
Chemistry 70 (2004) 323-344, Elsevier (astro-ph/0310624)
Revised: July 2009