Grant B. Bunker

  • Professor of Physics


B.S. The Evergreen State College
Ph.D. University of Washington

Research Interests

Biophysics, Synchrotron Radiation, X-ray Absorption Spectroscopy, Instrumentation, Novel Data Analysis Methods and Software, Computational Physics, Chemistry, Biology; Complex Systems.

Biophysics; X-ray absorption spectroscopy of metalloproteins; synchrotron radiation techniques and instrumentation; data analysis and molecular modeling; computational physics, chemistry, and biology.

Founding director 1991-2001, Biophysics Collaborative Access Team (BioCAT) at Argonne. President, Quercus X-ray Technologies, LLC, 2001-present.

Inventor of novel x-ray instrumentation and methods for data analysis.

Professional Affiliations & Memberships


Quantitative performance measurements of bent crystal Laue analyzers for X-ray fluorescence spectroscopy C. Karanfil,* G. Bunker M. Newville, C. U. Segre and D. Chapman J. Synchrotron Rad. (2012). 19, 375–380

"Introduction to XAFS: A Practical Guide to X-ray Absorption Fine Structure Spectroscopy", Cambridge University Press, 2009.

Zinc cysteine active sites of metalloproteins: A density functional theory and x-ray absorption fine structure study, N Dimakis, M Farooqi,Emily Sofia Garza,and G Bunker. The Journal of Chemical Physics 128, 115104, 2008.

"Group-fitted ab initio single- and multiple-scattering EXAFS Debye-Waller factors" Nicholas Dimakis and Grant Bunker Phys. Rev. B. Rapid Communications, 65 201103(R), 10 May 2002.

Initial results on logarithmic spiral bent laue analyzer for fluorescence x-ray absorption spectroscopy, C. Karanfil, D. Chapman, G. Bunker, C. Segre, Review of Scientific Instruments, vol 73 no 3, p 1616, 2002

"X-ray Absorption Spectrometers", G. Bunker, in Encyclopedia of Spectroscopy and Spectrometry, p2447-2554, Academic Press, 1999.

"Practical Regularization Methods for Analysis of EXAFS Spectra", G. Khelashvili and G. Bunker, J. Synch. Rad. 6, 271- 273 (1999)

Ab initio single- and multiple-scattering EXAFS Debye-Waller factors: Raman and infrared dataN Dimakis, G. Bunker. Phys. Rev. B 58, 2467-2475 (1998)

Application of the ratio method of EXAFS analysis to disordered systems, Bunker, G. Nuclear Instruments and Methods in Physics Research, vol. 207, issue 3, pp. 437-444.



  • Applications of x-ray absorption spectroscopy to biological systems and materials
  • Ab initio quantum mechanical calculation of vibrational behavior of enzymes and other molecular and nonmolecular systems
  • X-ray optics and instrumentation
  • Bent crystal optics
  • Energy conservation technologies
  • X-ray Absorption Fine Structure (XAFS) spectroscopy education and training
  • Investigations of complex systems and emergent order


  • ANL "Dynamic Self-Assembly of Active Bioparticles"


  • US 20060021690 "Integral pressure regulation system for tires and other vessels containing compressible fluids"

Community Service

  • Workshop on the physics of music and sound reproduction for fifth graders, Oak Park Global Village Young Scientist's Conference


X-ray Absorption Spectroscopy (XAFS) and Synchrotron Radiation.


Contact Information

312.567.3385 312.567.3494 182C Robert A. Pritzker Science Center By appointment