Department of Physics

materials science and soft condensed matter (experimental)

Structures of complex fluids and biomolecular systems both in bulk and as films and membranes studied with neutron and x-ray scattering; magnetic structures of thin films and multilayers; advanced neutron scattering instrumentation.

Dynamical theory calculations of spin-echo resolved grazing-incidence scattering from a diffraction grating: R. Ashkar, P. Stonaha, A. L. Washington, V. R Shah, M. R. Fitzsimmons, B. Maranville, C. F. Majkrzak, W. T. Lee, W. L. Schaich, and R. Pynn; J. Appl. Cryst., 43, 455 (2010).

Neutron Scattering; Roger Pynn; in McGraw-Hill Yearbook of Science and Technology, p 252, (2009).

Neutron Scattering - A Non-Destructive Microscope for Seeing Inside Matter; Roger Pynn, pp 15-36 in Neutron Applications in Earth, Energy and Environmental Sciences (Liyuan Liang, Romano Rinaldi and Helmut Schober Eds), Springer, (2008).

Birefringent Neutron Prisms for Spin Echo Scattering Angle Measurement; Roger Pynn, M. R. Fitzsimmons, W. T. Lee, P. Stonaha, V. R. Shah, A. L. Washington, B. J. Kirby, C. F. Majkrzak, and B. B. Maranville; presented at the International Conference on Polarized Neutrons in Condensed matter Research (Mito, Japan, September, 2008); Physica B 404, 2582-2584 (2009).

Measurement of the vortex core in sub-100 nm Fe dots using polarized neutron scattering by I. V. Roshchin, C.-P. Li, H. Suhl, X. Batlle, S. Roy, S. K. Sinha, S. Park, R. Pynn, M. R. Fitzsimmons, J. Mejia-Lopez, D. Altbir, A. H. Romero and I. K. Schuller; European Phys. Lett. 86, 67008 (2009).

Suppression of Nuclear Polarization near the Surface of Optically Pumped GaAs; M.R. Fitzsimmons, B.J. Kirby, N.W. Hengartner, F. Trouw, M.J. Erickson, S.D. Flexner, T. Kondo, C. Adelmann, C.J. Palmstrøm, P.A. Crowell, W. Chen, T.R. Gentile, J.A. Borchers, C.F. Majkrzak, and R. Pynn; Phys. Rev. B76, 245301 (2007).

Shear Induced Hexagonal Ordering Observed in an Ionic Viscoelastic Fluid in Flow Past a Surface; W. A. Hamilton, P. D. Butler, S. M. Baker, G. S. Smith, John B. Hayter, L. J. Magid, and R. Pynn; Phys. Rev. Lett., 72, 2219 (1994)

Diffuse X-ray and Neutron Reflection from Surfaces and Interfaces; S. K. Sinha and R. Pynn, in Local Structure from Diffraction, S. J. L. Billinge and M. F. Thorpe eds: (Plenum Press, NY, 1998).

Ordering of filamentous proteins and associated molecules through confinement in micro-arrays; N. F. Bouxsein, L. S. Hirst, Y. Li, C. R. Safinya, Z. Abu Samah, N. MacDonald, R. Pynn; Appl. Phys. Lett., 85, 5775 (2004).

Neutron Spin Echo Scattering Angle Measurement (SESAME); Roger Pynn, Michael R. Fitzsimmons, Helmut Fritzsche, Marita Gierlings, Janos Major and Andrew Jason; Rev. Sci. Instrum., 76, 053902 (2005).

Microchannel Systems in Titanium and Silicon for Structural and Mechanical Studies of Aligned Protein Self-Assemblies; L. S. Hirst, E. R. Parker, Z. Abu-Samah, Y. Li, N. C. MacDonald, R. Pynn and C. R. Safinya; Langmuir 3910, 21(9), (2005).

Micelle to vesicle transition of an iron chelating surfactant, Marinobactin E; Tate Owen, Roger Pynn, Jennifer Martinez and Alison Butler; Langmuir, 21, 12109 (2005).

Hierarchical Self-Assembly of Actin Bundle Networks: Gels with Surface Protein Skin-Layers: L. S. Hirst, R. Bruinsma, R. Pynn and C. R Safinya; J. Chem. Phys., 123, 104902 (2005).

Vector Magnetization Depth Profile of a Laves Phase Exchange Coupled Superlattice obtained using a Combined Approach of Micromagnetic Simulation and Neutron Reflectometry; M. R. Fitzsimmons, S. Park, K. Dumesnil, C. Dufour, R. Pynn, J. A. Borchers, J. J. Rhyne, and Ph Mangin; Phys. Rev B73, 134413 (2006).

Oak Ridge National Laboratory

materials science and soft condensed matter (experimental)

Structures of complex fluids and biomolecular systems both in bulk and as films and membranes studied with neutron and x-ray scattering; magnetic structures of thin films and multilayers; advanced neutron scattering instrumentation.

Dynamical theory calculations of spin-echo resolved grazing-incidence scattering from a diffraction grating: R. Ashkar, P. Stonaha, A. L. Washington, V. R Shah, M. R. Fitzsimmons, B. Maranville, C. F. Majkrzak, W. T. Lee, W. L. Schaich, and R. Pynn; J. Appl. Cryst., 43, 455 (2010).

Neutron Scattering; Roger Pynn; in McGraw-Hill Yearbook of Science and Technology, p 252, (2009).

Neutron Scattering - A Non-Destructive Microscope for Seeing Inside Matter; Roger Pynn, pp 15-36 in Neutron Applications in Earth, Energy and Environmental Sciences (Liyuan Liang, Romano Rinaldi and Helmut Schober Eds), Springer, (2008).

Birefringent Neutron Prisms for Spin Echo Scattering Angle Measurement; Roger Pynn, M. R. Fitzsimmons, W. T. Lee, P. Stonaha, V. R. Shah, A. L. Washington, B. J. Kirby, C. F. Majkrzak, and B. B. Maranville; presented at the International Conference on Polarized Neutrons in Condensed matter Research (Mito, Japan, September, 2008); Physica B 404, 2582-2584 (2009).

Measurement of the vortex core in sub-100 nm Fe dots using polarized neutron scattering by I. V. Roshchin, C.-P. Li, H. Suhl, X. Batlle, S. Roy, S. K. Sinha, S. Park, R. Pynn, M. R. Fitzsimmons, J. Mejia-Lopez, D. Altbir, A. H. Romero and I. K. Schuller; European Phys. Lett. 86, 67008 (2009).

Suppression of Nuclear Polarization near the Surface of Optically Pumped GaAs; M.R. Fitzsimmons, B.J. Kirby, N.W. Hengartner, F. Trouw, M.J. Erickson, S.D. Flexner, T. Kondo, C. Adelmann, C.J. Palmstrøm, P.A. Crowell, W. Chen, T.R. Gentile, J.A. Borchers, C.F. Majkrzak, and R. Pynn; Phys. Rev. B76, 245301 (2007).

Shear Induced Hexagonal Ordering Observed in an Ionic Viscoelastic Fluid in Flow Past a Surface; W. A. Hamilton, P. D. Butler, S. M. Baker, G. S. Smith, John B. Hayter, L. J. Magid, and R. Pynn; Phys. Rev. Lett., 72, 2219 (1994)

Diffuse X-ray and Neutron Reflection from Surfaces and Interfaces; S. K. Sinha and R. Pynn, in Local Structure from Diffraction, S. J. L. Billinge and M. F. Thorpe eds: (Plenum Press, NY, 1998).

Ordering of filamentous proteins and associated molecules through confinement in micro-arrays; N. F. Bouxsein, L. S. Hirst, Y. Li, C. R. Safinya, Z. Abu Samah, N. MacDonald, R. Pynn; Appl. Phys. Lett., 85, 5775 (2004).

Neutron Spin Echo Scattering Angle Measurement (SESAME); Roger Pynn, Michael R. Fitzsimmons, Helmut Fritzsche, Marita Gierlings, Janos Major and Andrew Jason; Rev. Sci. Instrum., 76, 053902 (2005).

Microchannel Systems in Titanium and Silicon for Structural and Mechanical Studies of Aligned Protein Self-Assemblies; L. S. Hirst, E. R. Parker, Z. Abu-Samah, Y. Li, N. C. MacDonald, R. Pynn and C. R. Safinya; Langmuir 3910, 21(9), (2005).

Micelle to vesicle transition of an iron chelating surfactant, Marinobactin E; Tate Owen, Roger Pynn, Jennifer Martinez and Alison Butler; Langmuir, 21, 12109 (2005).

Hierarchical Self-Assembly of Actin Bundle Networks: Gels with Surface Protein Skin-Layers: L. S. Hirst, R. Bruinsma, R. Pynn and C. R Safinya; J. Chem. Phys., 123, 104902 (2005).

Vector Magnetization Depth Profile of a Laves Phase Exchange Coupled Superlattice obtained using a Combined Approach of Micromagnetic Simulation and Neutron Reflectometry; M. R. Fitzsimmons, S. Park, K. Dumesnil, C. Dufour, R. Pynn, J. A. Borchers, J. J. Rhyne, and Ph Mangin; Phys. Rev B73, 134413 (2006).

Oak Ridge National Laboratory