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Search Publications by: Eric L. Shirley (Fed)

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Displaying 51 - 75 of 185

Exciton Spectroscopy of Hexagonal BN Using Non-Resonant X-Ray Raman Scattering

April 8, 2008
Author(s)
Y Feng, J A. Soininen, A L. Ankudinov, J O. Cross, Gerald T. Seidler, A T. Macrander, J J. Rehr, Eric L. Shirley
We report non-resonant x-ray Raman scattering (XRS) measurements from hexagonal BN for transferred momentum from 2 Angstrom} -1 to 9 Angstrom} -1 along directions both in and out of the basal plane. A symmetry-based argument together with calculations of

Two-Phonon Infrared Spectra of Si and Ge: Calculating and Assigning Features

August 16, 2007
Author(s)
Eric L. Shirley, Hadley Lawler
Third-order density-functional perturbation theory yields the terahertz/far-infrared absorption spectra for silicon and germanium, including all two-phonon combination and difference features. Temperature-dependent spectra are compared to available

Ferroelectric Distortion in SrTiO3 Thin Films on Si(001) by X-Ray Absorption Fine Structure: Experiment and First-Principles Calculations

April 23, 2007
Author(s)
Joseph C. Woicik, Eric L. Shirley, C S. Hellberg, S Sambasivan, Daniel A. Fischer, B D. Chapman, E A. Stern, P Ryan, D L. Ederer, H Li
Ti K and Ti L2,3 edge x-ray absorption fine-structure near-edge spectra of SrTiO3 thin films grown coherently on Si(001) reveal the presence of a ferroelectric (FE) distortion at room temperature. This unique phase is a direct consequence of the

Diffraction Effects in Radiometry

January 26, 2005
Author(s)
Eric L. Shirley
This is the draft submitted to be Chapter 10 of the book, Modern Radiometric Practice, edited by Albert C. Parr, Raju U. Datla, and James W. Gardner. This chapter is intended to discussion issues of diffraction effects on radiometric measurements.

Appendix A; Example: Calibration of a Cryogenic Blackbody

January 22, 2005
Author(s)
Raju V. Datla, Eric L. Shirley, Albert C. Parr
This manuscript is intended to be an Appendix in a book on radiometry, The Practice of Optical Radiometry. The Appendix is to provide a real example of a blackbody calibration, in order to demonstrate the statistical analysis of data. The role of

Li 1s Near-Edge Spectra in Six Lithium Halides

July 1, 2004
Author(s)
Eric L. Shirley
Theoretical results are presented for Li 1s near-edge absorption spectra in LiH, LiF, LiCl, LiBr, LiI and LiAt. These results are obtained using a realistic band structure and wave functions, and include effects of the electron-core hole attraction in

Ti ls Pre-Edge Features in Rutile: A Bethe-Salpeter Calculation

May 1, 2004
Author(s)
Eric L. Shirley
This work studies Ti K-edge excitation in rutile TiO2 by considering the x-ray absorption spectrum in a Bethe-Salpeter approach. This work compares resultes obtained by experiment and previous theoretical results obtain within the Anderson impurity model

Intuitive Diffraction Model for Multistaged Optical Systems

February 1, 2004
Author(s)
Eric L. Shirley
A simplified framework is motivated, in which many diffraction effects can be treated, especially in multi-staged optical systems. These include effects of limiting apertures, although this work may be especially suitable when considering diffraction