David Penn

David Penn is a CNST Visiting Fellow in the Electron Physics Group in the CNST. He has been at NIST since 1972. He received a Ph.D. in Physics from the University of Chicago, and performed postdoctoral research at Argonne National Laboratory as well as the Atomic Energy Research Establishment in Harwell, England. Prior to coming to NIST, David was a Visiting Professor of Physics at the University of California at Berkeley and at the University of Chicago, and was an Assistant Professor of Physics at Brown University. His early research included a model for the dielectric function of a semiconductor, which came to be known as the "Penn model," with the associated publication, "Wave-Number-Dependent Dielectric Function of Semiconductors," Phys.Rev. 128, 2093 (1962), becoming a citation classic. He has also investigated theoretical aspects of the magnetic phases of transition metals, field emission and photoemission from adsorbate-covered metal surfaces, energy loss of electrons in solids, electron energy loss in core-level and valence-level x-ray emission, photo-absorption from small spheres, spin-polarized secondary electrons, high-T_c, superconductivity, resonant tunneling in hetrojunctions, and giant magnetoresistance. David is a Fellow of the American Physical Society.

• Calculations of Electron Inelastic Mean Free Paths III. Data for 15 Inorganic Compounds over the 50-2000eV Range, S. Tanuma, C. J. Powell and D. R. Penn, Surface and Interface Analysis 17(13), 927-939 (1991).
• Calculations of Electron Inelastic Mean Free Paths II. Data for 27 Elements over the 50-2000eV Range, S. Tanuma, C. J. Powell and D. R. Penn, Surface and Interface Analysis 17(13), 911-926 (1991).
• Calculations of Electron Inelastic Mean Free Paths for 31 Materials, S. Tanuma, C. J. Powell and D. R. Penn, Surface and Interface Analysis 11(11), 577-589 (1988).
• Electron Mean-Free-Path Calculations Using a Model Dielectric Function, D. R. Penn, Physical Review B 32(2), 482-486 (1987).
• Quantitative Chemical Analysis by ESCA, D. R. Penn, Journal of Electron Spectroscopy and Related Phenomena 9, 29-40 (1975).
• Wave-Number-Dependent Dielectric Function of Semiconductors, D. R. Penn, Phys. Rev. 128, 2093 (1962).