Patrick G. Allen

Portrait of Patrick G. Allen

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  • Title
    Materials Program Leader
  • Email
    allen42@llnl.gov
  • Phone
    (925) 423-8955
  • Organization
    Not Available

Research Interests

Dr. Allen's research interests are in solid-state physics and structural inorganic chemistry, with particular emphasis on the study of actinide elements and their physical properties. He also has extensive experience in structural characterization techniques, including synchrotron-based x-ray absorption spectroscopy (XAS) and time-resolved spectroscopic methods. Dr. Allen's current research focuses on the thermodynamic and vibrational properties of actinide-based metals and alloys, along with the material dynamics of related systems.

Ph.D. Physical Chemistry, University of Michigan, 1993

  1. Yaakobi, B., D. D. Meyerhofer, T. R. Boehly, J. J. Rehr, B. A. Remington, P. G. Allen, S. M. Pollaine, and R. C. Albers. "Extended X-Ray Absorption Fine Structure Measurements of Laser-Shocked V and Ti and Crystal Phase Transformation," Ti. Phys. Rev. Lett. 92, 095504 (2004).
  2. Nelson, E. J., K. J. M. Blobaum, M. A. Wall, P. G. Allen, A. J. Schwartz, and C. H. Booth, "Local Structure and Vibrational Properties of Alpha '-Pu Martensite in Ga-Stabilized Delta-Pu," Art. No. 224206, Physical Review B 6722(22):4206 (2003).
  3. Wheaton, V., D. Majumdar, K. Balasubramanian, L. Chauffe, and P. G. Allen, "A Comparative Theoretical Study of Uranyl Silicate Complexes," Chemical Physics Letters 371(3-4):349-359 (2003).
  4. Roberts, K. E., T. J. Wolery, C. E. Atkins-Duffin, T. G. Prussin, P. G. Allen, J. J. Bucher, D. K. Shuh, R. J. Finch, and S. G. Prussin, "Precipitation of Crystalline Neptunium Dioxide from Near-Neutral Aqueous Solution," Radiochimica Acta. 91(2):87-92 (2003).
  5. Karabulut, M., G. K. Marasinghe, C. S. Ray, D. E. Day, G. D. Waddill, C. H. Booth, P. G. Allen, J. J. Bucher, D. L. Caulder, and D. K. Shuh, "An Investigation of the Local Iron Environment in Iron Phosphate Glasses Having Different Fe(II) Concentrations" Journal of Non-Crystalline Solids 306(2):182-192 (2002).
  6. den Berghe, S. V., M. Verwerft, J.-P. Laval, B. Gaudreau, P. G. Allen, and A. Van Wyngarten, "The Local Uranium Environment in Cesium Uranates: A Combined XPS, XAS, XRD and Neutron Diffraction Analysis," J. Solid State Chem. 166, 320-329 (2002).
  7. Allen, P. G., A. L. Henderson, E. R. Sylwester, P. E. A. Turchi, T. H. Shen, G. F. Gallegos, and C. H. Booth, "Vibrational Properties of Ga Stabilized Delta Plutonium," Physical Review B 65, 214107 (2002).
  8. Sylwester, E. R., P. G. Allen, U. Dharmawardana, and M. Sutton, "Structural Studies of Uranium and Thorium Complexes with Pyrocatechol-3,5-disodium Sulfonate (Tiron) at Low and Neutral pH by X-Ray Absorption Spectroscopy," Inorg. Chem. 40, 2835 (2001).
  9. Yaita, T., S. Tachimori, N. Edelstein, J. Bucher, D. Shuh, and P. Allen, "EXAFS Studies of Americium (III) Benzimidazole Complexes in Ethanol," J. Synchrotron Rad. 8, 663-665 (2001).
  10. Hakem, N. L., E. R. Sylwester, and P. G. Allen, "Effect of EDTA on Plutonium Migration," J. Radioanalytical and Nucl. Chem. 250, p 47 (2001).
  11. Allen, P. G., D. K. Shuh, J. J. Bucher, N. M. Edelstein, and T. Reich, "Coordination Chemistry of Trivalent Lanthanide and Actinide Ions in Dilute and Concentrated Chloride Solutions," Inorganic Chemistry 39, 595-601 (2000).
  12. Booth, C. E., P. G. Allen, D. K. Shuh. J. J. Bucher, G. K. Marasinghe, M. Karabulut, C. S. Ray, and D. E. Day, "Oxygen and Phosphorus Coordination Around Iron in Iron-Phosphate Glasses with UO2 or Na2O and Crystalline Ferric Ferrous Pyrophophate," J. Mater. Research 14, 2628-2639 (1999).
  13. Hudson, E. A., L. J. Terminello, B. E. Vianni, M. Denecke, T. Reich, P. G. Allen, J. J. Bucher, and D. K. Shuh, "The Structure of Uranium(VI) Sorption Complexes on Vermiculite and Hydrobiotite," Clay and Clay Minerals 47, 439-457 (1999).
  14. Wasserman, S., P. G. Allen, and N. M. Edelstein, "EXAFS and Principal Component Analysis: A New Shell Game," J. of Synchrotron Rad. 6, 284-286 (1999).
  15. Fabris, L., P. G. Allen, J. J. Bucher, N. M. Edelstein, D. A. Landis, N. W. Madden, and D. K. Shuh, "A Fast Zero Dead-Time Single Channel Analyzer for Nuclear Spectroscopy Applications," IEEE Transactions on Nuclear Science 46, 417-419 (1999).
  16. Durbin, P. W., B. Kullgren, J. Xu, K. N. Raymond, P. G. Allen, J. J. Bucher, N. M. Edelstein, and D. K. Shuh, "Neptunium(237): Oxidation State In Vivo and Chelation by Multidentate Catecholate and Hydroxypyridinonate Ligands," Health Physics 75, 34-50 (1998).
  17. Feng, X., H. Li, J. G. Darab, M. J. Schweiger, J. D. Vienna, B. C. Bunker, P. G. Allen, D. K. Shuh, J. J. Bucher, N. M. Edelstein, R. C. Ewing, and L. M. Wang, "Distribution and Solubility of Radionuclides in Waste Forms for Disposition of Pu and Spent Nuclear Fuels," Int’l. Symp. On Waste Mgmt. Tech., American Ceramic Society National Meeting, Cincinnati, OH (1998).
  18. Reich, T., S. Pompe, M. Bubner, K. H. Heise, P. G. Allen, D. K. Shuh, J. J. Bucher, N. M. Edelstein, and M. A. Denecke, "Determination of Structural Parameters of Uranyl Ions Complexed with Organic Acids Using EXAFS," J. Alloys and Compounds 271, 123-127 (1998).
  19. Marasinghe, G. K., M. Karabulut, C. S. Ray, D. E. Day, C. E. Booth, P. G. Allen, D. K. Shuh, "Redox Characteristics and Structural Properties of Iron Phosphate Glasses: A Potential Host Matrix for Vitrifying High Level Nuclear Waste," Ceramic Transactions 87, 261 (1998).
  20. Allen, P. G., G. S. Siemering, D. K. Shuh, J. J. Bucher, N. M. Edelstein, C. A. Langton, S. B. Clark, T. Reich, and M. A. Denecke, "Characterization of Technetium in Cement Waste Forms by X-ray Absorption Fine Structure Spectroscopy," Radiochim. Acta 76, 77-86 (1997).
  21. Allen, P. G., D. K. Shuh, J. J. Bucher, N. M. Edelstein, T. Reich, M. A. Denecke, and H. Nitsche, "Chemical Speciation Studies of Radionuclides by XAFS, XAFS-IX International Conference Proceeding," Grenoble, August, 1996. J. de Physique IV 7, 789-792 (1997).
  22. Denecke, M. A., T. Reich, S. Pompe, M. Bubner, P. G. Allen, D. K. Shuh, J. J. Bucher, and N. M. Edelstein, "Differentiating between Monodentate and Bidentate Carboxylate Ligands Coordinated to Uranyl Ions Using EXAFS," XAFS-IX International Conference Proceeding, Grenoble, August, 1996. J. de Physique IV 7, 637-638 (1997).
  23. Marasinghe, G. K., M. Karabulut, C. S. Ray, D. E. Day, M. G. Shumsky, W. B. Yelon, C. E. Booth, P. G. Allen, and D. K. Shuh, "Structural Features of Iron Phosphate Glasses, Journal of Noncrystalline Solids," 222, 144-152 (1997).
  24. Allen, P. G., D. K. Shuh, J. J. Bucher, N. M. Edelstein, and T. Reich, "Investigation of Aquo and Chloro Complexes of UO22+, NpO2+, Np4+, and Pu3+ by X-ray Absorption Fine Structure Spectroscopy," Inorganic Chemistry 36, 4676-4683 (1997).
  25. Allen, P. G., D. K. Shuh, J. J. Bucher, N. M. Edelstein, C. E-A. Palmer, L. N. Marquez, E. A. Hudson, R. J. Silva, S. N. Nguyen, "EXAFS Determinations of Uranium Structures: Schoepite and Other U(VI) Oxide Precipitates," Radiochim. Acta 75, 47-53 (1997).
  26. Allen, P. G., D. K. Shuh, J. J. Bucher, N. M. Edelstein, T. Reich, M. A. Denecke, and H. Nitsche, "Applications of Synchrotron Radiation to Chemical Issues in the Environmental Sciences, in Appl. of Synchrotron Radiation in Industrial, Chemical, and Materials Science," edited by K. D'Amico, L. Terminello, and D. K. Shuh, ACS Symposium Monograph; Plenum , New York, 169-186 (1996).
  27. Morris, D. E., P. G. Allen, J. M. Berg, C. J. Chisolm-Brause, S. D. Conradson, R. J. Donohoe, N. J. Hess, J. A. Musgrave, and C. D. Tait, "Speciation of Uranium in Fernald Soils by Molecular Spectroscopic Methods: Characterization of Untreated Soils," Environ. Sci & Technol. 30, 2322-2331 (1996).
  28. Hudson, E. A., P. G. Allen, L. J. Terminello, M. Denecke, and T. Reich, "Polarized x-ray Absorption Spectroscopy of Uranyl: Comparison of Experiment and Theory," Phys. Rev. B 54, 156 (1996).
  29. Allen, P. G., D. K. Veirs, S. D. Conradson, C. A. Smith, and S. F. Marsh, "Characterization of Aqueous Pu (IV) Nitrate Complexes by Extended X-ray Absorption Fine Structure Spectroscopy," Inorganic Chemistry 35, 2841-2845 (1996).
  30. Edelstein, N. M., P. G. Allen, J. J. Bucher, and D. K. Shuh, C. D. Sofield, et al., "The Oxidation State of Ce in the Sandwich Molecule Cerocene," J. Am. Chem. Soc. 118, 13115-13116 (1996).
  31. Allen, P. G., D. K. Shuh, J. J. Bucher, N. M. Edelstein, C. E-A. Palmer, and L. N. Marquez, "EXAFS Spectroscopic Studies of Uranium (VI) Oxide Precipitates. Aqueous Chem. and Geochem. of Oxides and Oxyhydroxides," edited by J. A. Voigt et al. MRS Proc. 432, 139-143 (1996).