Dr. Sultana Nurun Nahar

RESEARCH: Atomic Astrophysics, Spectroscopy, and Applications


OPACITY PROJECT & IRON PROJECT
PHOTOIONIZATION
RADIATIVE TRANSITIONS
NANO-BIOMEDICINE
ELECTRON-POSITRON SCATTERING
SOLAR IRON OPACITY
ELECTRON-ION RECOMBINATION
ELECTRON-IMPACT EXCITATIONS
DIELECTRONIC SATELLITE LINES
RESEARCH ACTIVITIES

THE OPACITY PROJECT & THE IRON PROJECT:
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  • August 2006: Iron Project members and "High Accuracy Atomic Physics in Astronomy", Honoring M.J. Seaton, workshop organized by A.K. Pradhan and S.N. Nahar at Harvard University

  • As a member of the international collaborations, the Opacity Project and the Iron Project , a significant part my researh is related to them.

  • Objectives of the projects: To study and calculate accurate atomic parameters for radiative and collisional processes of astrophysically abundant atoms and ions for applications to astrophysical plasmas.
  • Theoretical calculations employ state-of-the-art quantum mechanical techniques based on the ab initio R-matrix method in the close coupling approximation.
  • Leading contributor for the radiative processes of the Iron Project team
  • The atomic processes under investigation are dominant in astrophysical plasmas. The results are applicable to both astrophysical and laboratory plasmas for spectral and diagnostic analysis.

    PUBLICATIONS:

  • Publications on solar opacity
  • Publications under the Opacity Project are in the two compiled volumes - The Opacity Project Team ."The Opacity Project", Vol 1, 1995, Vol. 2, 1996, Institute of Physics Publishing

  • Examples of invited presentations:
    - Zewail City of Science and Technology, Egypt, March 7, 2013: "Solar plasma opacity and nebular elemental abundances", Sultana N. Nahar
    - Intl Symp on Climate Change & Food Security in South Asia 2008 (UN sponsored), SESSION 4: "Solar Irradiation of the Earth's Atmosphere"

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  • August 2017: Iron Project and OP/IPv2 meeting, i) Regener, Sultana, Patrick, Claudio, Shashi, Lianshui, Tony, ii) Anil, Patrick, Lianshui, Shashi, Tony, Javier, Franck, Manuel, Claudio, iii) Discussions - Workshop on Astrophysical Opacities (WAO), Western Michigan University, Kalamazoo

  • Team members (past and present) are from a number of places:

    - The Ohio State University,
    - University College London,
    - Stuttgart University,
    - Observatorie de Paris
    - Belfast University,
    - IVIC-Venezuela,
    - Shefield University

  • Dr. Lotfia El Nadi, Egypt,
    etc

    Iron Lady for considerable work on iron ions referred in:
    - In the first annual OSU Astronomy Magazine: "Meet the Iron Lady", p.21, 2005
    - Chapter 5: "Dreaming of the Star Treatment" in the book "Science Unshacled" (Renee James, Fall 2014, Johns Hopkins U press)) describes astronomical study and leads to cancer treatment that we propose where section 35 titles "The Iron Lady and the Gold Standard"
    - OSC Highlights "High-precision atomic astrophysics: From black holes to nanotechnology" of its calendar, Feb, 2010
    - Ohio Supercomputer Center (OSC) press release "X-ray researchers turn focus from black holes to cancer", Columbus, OH, January 28, 2010


    SOLAR IRON OPACITY:
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  • Project collaborators: L: Sultana, Jim Bailey, Anil at Sandia Z Workshop 2015, M: Group meeting at OSU with Reger Trampedach from Space Sciences at Colarado 2017, R: OSU visit by Jeff Valenti for UV opacity project, 2016

  • Objective: Solar opacity is directly related to its abundances of elements and iron is one dominant element causing considerable opacity. The solar iron opacity project aims to resolve the decage long standing controversy for the abundances of the sun.

  • Description of the process: High Accuracy Radiative Data For Plasma Opacities, Invited presentation at ASOS 2010, Berkeley

  • PUBLICATIONS:
    On oscillator strengths and photoionization of Iron ions (Fe XIV - Fe XX) for solar opacity

  • Recent extended work on Fe VIII photoionization using 99-cc wavefunction expansion by Nahar indicates considerable missing photoabsorption in the current opacity, Z Fundamental Science Program Workshop, Sandia National Lab, Albuquerque, July 2015

  • Team members of IRON OPACITY Project:

  • Professor Anil K. Pradhan, OSU, USA
  • Dr. Werner Eissner, Stuttgart University, Germany
  • Dr. Chris Orban, OSU
  • Dr. James E. Bailey, Z Fundamental Science Research (ZFSP), Sandia National Lab, Alburquerque, NM, at ZFSP workshop 2015, Albuquerque
  • Dr. Regner Trampedach, Space Research Lab, Colorado at ZFSP workshop 2015, Albuquerque

    OPACITY OF COOL STARS:

  • Objective: Study opacity of neutrals or near neutrals in the photosphere of cool stars

  • Collaborators:

  • Professor Anil K. Pradhan, OSU, USA
  • Dr. Jeff Valenti, Space Telescope and Science Institute, USA (Jeff's visit Jan 2016)


    PHOTOIONIZATION & ASTROPHYSICAL MODELING:
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    i) 2016: OSC Presentation of photoionization of P II (a basic element of life) (Sultana and Russ Pitzer), ii) 2017 Workshop on Astrophysical Opacities: Fe XVII photoionization impact on solar opacity

  • Found number of prominent features in photoionization which are described in text book "Atomic Astrophysics and Spectroscopy (AAS)"

  • Description of the process: Photoionization
  • Publications in Photoionization/ Opacity/ Modeling
  • Cross sections available at NORAD-Atomic-Data

  • Significant part of the work are carried out under the Opacity Project and the Iron Project

  • Group Members (past and present):

  • Professor Anil K. Pradhan, OSU, USA
  • Dr. Werner Eissner, University of Stuttgart, Germany
  • Dr. Claude Zeippen, Observatorie De Paris, France
  • Dr. Honglin Zhang, Los Alamos National Lab, New Mexico
  • Dr. Aaron Sigut, University of Western Ontario, Canada
  • Dr. Justin Oelgoetz, Austin Peay State University, Tennessee
  • Dr. Manual Bautista, Western Michigan University
  • Dr. Ron Phaneuf, University of Nevada
  • Dr. Aaron Covington, University of Nevada
  • Dr. Alex Aguiar, University of Nevada
  • Dr. Guillermo iHinojos, Universidad Nacional Autónoma de México
  • Dr. Jean-Marc Bizau, ISMO, Universite Paris-Sud, France
  • VahidReza Adineh, Iran


    ELECTRON-ION RECOMBINATION & IONIZATION FRACTIONS:

  • Introduced with A.K. Pradhan "the unified method" for total electron-ion recombination (see publications and book AAS)

    - Lyman Spitzer's appreciation on unified method: Letter 1, Letter 2

  • Description of the process: Electron-ion recombination
  • Publications in Electron-Ion Recombination
  • Cross sections, recombination rates available at NORAD-Atomic-Data

  • Significant part of the work are carried out under the Opacity Project and the Iron Project

  • Examples of invited presentations:
    - Workshop: "Atomic Physics in Astronomy", Honoring M.J. Seaton, ITAMP-HARVARD, (2006): "The Iron Project: Atomic Processes in Astrophysical Plasmas

  • Group Members (past and present):

  • Professor Anil K. Pradhan, OSU, USA
  • Dr. Hong Lin Zhang, Los Alamos National Lab
  • Dr. Manual Bautista, Western Michigan University


    RADIATIVE TRANSITIONS, LIFETIMES, & SPECTROSCOPY:

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  • i) Slide shows interpretation of photoabsorption due to Fe II on Planck's distribution curve of the sun, Perkins Observatory, Ohio, Jan 19, 2017 ii) 2015 DAMOP: Charlotte, Sultana, Jim - in radiative transitions

  • Developed spectroscopy for identifications of calculated levels and transitions in R-matrix method (see publications and book AAS)

  • Description of the process: Radiative transition probabilities
  • Publications in Radiative transitions and lifetimes
  • Transition parameters (f,S,A), lifetimes are available at NORAD-Atomic-Data

  • Significant part of the work are carried out under the Opacity Project and the Iron Project

  • Group Members (past and present):

  • Professor Anil K. Pradhan, OSU, USA
  • Dr. Werner Eissner, Stuttgart University, Germany
  • Dr. Franck Delahaye, Observatoire de Paris, Meudon, France
  • Dr. Chiranjib Sur, Shell Lab, India
  • Dr. Gouxin-Chen, ITAMP-Harvard
  • Dr. Gultekin Celik, Turkey
  • Dr. Sule Ates, Turkey
  • Dr. Akeel Hashem, Iraq
  • Mr. Luo Yi,
  • Mr. J. Peng
  • Mahmudul Hasan, Bangladesh
  • Dr. Tahmina Ferdous, Bangladesh
  • Dr. Betul Ataly, Turkey


    DIELECTRONIC SATELLITE (DES) LINES & ASTROPHYSICAL MODELING:

  • With A.K. Pradhan developed method to obtain detailed features with natural broadening of DES lines, not obtained in isolated resonance method.

  • Description of the process: Di-electronic satellite lines
  • Detailed theory: Dielectronic Satellite Lines
  • Publications in DES lines and astrophysical applications

  • The method is based on extention of the Unified Theory for total electron-ion recombination.

  • Group Members (past and present):

  • Professor Anil K. Pradhan
  • Dr. Ramadan Semida, Egypt


    ELECTRON-IMPACT EXCITATION (EIE) & LINE RATIOS:

  • Employ relativistic Breit-Pauli R-matirx (BPRM) method to calculate collision strengths for EIE and study features with high accuracy for solution of abundance problems in this plasmas (see publications and book AAS)

  • Description of the process: astrophysical background, process, and features of collision strengths: ex. Ne V
  • Theory: Electron-ion scattering and line ratios
  • Publications on collision strengths and line ratios
  • Limited number of collision strengths are available at NORAD-Atomic-Data

  • Studied oxygen and neon for planetary nebulae, ULIRG

  • Group Members (past and present):

  • Professor Anil K. Pradhan
  • Dr. Werner Eissner, Stuttgart University, Germany
  • Dr. Maximiliano Montenegro, Catholic University of Chile
  • Ethan Palay, Collarado School of Mines
  • Michael Dance, University of North Carolina
  • Hala, OSU and Aligarh Muslim University
  • Yasin Gokce, Turkey
  • Dr. Lotfia El Nadi, Egypt,


    NANO-BIOMEDICINE:
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    - L: Presentation of "Monochromatic X-rays for Cancer Theranostics", SUG Meeting of OSC, Columbus, Dec 3, 2015, R: Biomed roup picture 2013

  • Proposed with A.K. Pradhan and Yu Yan, the new method "Resonant Nano-Plasma Theranostics (RNPT)" for cancer treatment - based on narrow band x-ray spectroscopy
  • Co-leader: Multi-disciplinary Biomedical Nanoscience program on RNPT: Astronomy, Physics, Chemistry, Pathology, Radiation Oncology

  • Description of the method: RNPT

  • Publications on RNPT
    - RNPT Research Activities and Publications

  • RNPT is referred to as one of the four important contributions of astronomy to human life: GPS, wireless internet, RNPT, and laser eye surgery (Astronomy magazine, May 2012, p.31-35).
  • Chapter 5: "Dreaming of the Star Treatment" in the book "Science Unshacled" (Renee James, Fall 2014, Johns Hopkins U press)) describes astronomical study and how it leads to RNPT for cancer treatment and includes section 35 "The Iron Lady and the Gold Standard"
  • Examples invited presentations:
    - Intl Symp on Molecular Spectroscoy, Session honoring R.M. Pitzer, Ohio State University, 2008: "ATOMIC SPECTROSCOPY: ASTRONOMY TO BIO-MEDICAL SCIENCE"

  • Group Members (past and present):

  • Professor Anil K. Pradhan, OSU, USA
  • Dr. Yu Yan, Radiation Oncology, Thomas Jefferson University
  • Dr. Maximiliano Montenegro, Catholic University of Chile
  • Dr. Jian Wang, Radiation Oncology, OSU
  • Dr. Rolf Barth, Pathology, OSU
  • Dr. Sara Lim, Wisconsin Medican Institute
  • Max Westphal, Biophysics, OSU
  • Dr. Russel M. Pitzer, Chemistry, OSU
  • Dr. Claudia Tarra, Chemistry, OSU
  • Dr. Enam Chowdhury, Physics, OSU
  • Dr. Erica Bell, Radiation Oncology
  • Dr. Arnab Chakroborty, Radiation Oncology
  • Dr. Nilendu Gupta, Radiation Oncology, OSU

  • Recognitions


    ELECTRON, POSITRON SCATTERING & SPIN POLARIZATION:

  • Wrote one extensive code for Dalitz integrals for positronium formation. Also wrote one code for electron-positron scatterings from atoms and spin polarization parameters during Ph.D. work and some continudation.

  • Description of the method: for positronium formation & for scatterings and spin polarization
  • Publications on electron, positron scatterings and spin polarization

  • The original and modified code for electron-positron scatterings from atoms and spin polarization parameters is used by many researchers in India.

  • Group Members (past and present):

  • Dr. J.M. Wadehra: Wayne State University
  • Dr. A.N. Tripathy, Roorkee Institute of Technology, India


    RESEARCH ACTIVITIES:

  • RESEARCH ACTIVITIES ARE LISTED IN "Presentations"

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    i) Group at ICPEAC conference 2009, ii) Sultana at the Arab Conference of Astronomy and Geophysics, 5th assembly (ACAG-5), Egypt 2016, iii) Burcin (Miami University, OH), Muneera (Dammam University) made presentations at Astronomy group meeting, August 2016
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  • L: Group members 2013, M: Sara's Ph.D. defence 2014, R: Max's research presentation, Dec 2015,

  • SOME EVENTS LISTED BELOW:

  • Sara N. Lim defends her Ph.D. thesis "Low Energy X-ray Radiosensitization Activated with High-Z Elements", - Group waiting in Graves Hall hallway, - Dr. Sara N. Lim, - Celebration with universe cake, - Sara with research advisors, OSU, November 6, 2014

  • Ethan Palay presents collsional work at the Undergraduate Scholar Presentation, OSU, 2012

  • Intl Symp Molecular Spectroscopy, Ohio State University, 2008: Sultana presented invited talk at the session honoring Russ Pitzer who received honorary plaque at the meeting picnic

  • Events at DAMOP07 where Sultana received APS Fellowship recognition, Calgary, Canada, June, 2007