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Search Publications by: Eric L. Shirley (Fed)

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Displaying 1 - 25 of 372

Calibration for Astrophysics using an Artificial star with NIST-traceable Distribution of Luminous Energy (CANDLE) Instrument Development

August 23, 2024
Author(s)
Joseph P. Rice, Brian Alberding, Susana Deustua, Thinh Bui, Eric Shirley, Keshet Shavit, Eliad Peretz, Daniel Kuesters, Greg Aldering, Dmitry Vorobiev, Jonathan Papa, Justin Albert, Ralph Bohlin, Benjamin Rose, Piotr Pachowicz, Peter Plavchan, Angella Tanner, John Mather, Jean Thomas Landry, Etienne Gauvin, Thomas Michaud=Bayens, Greg Kopp
The CANDLE Engineering Demonstration Unit (EDU) was selected by the 2022 APRA program to develop and demonstrate that we can reach the flux accuracy and range required for an artificial star. A critical issue in producing accurate and reliable flux

Instrument Development for Spectroscopic Ellipsometry and Diffractometry in the EUV

April 24, 2024
Author(s)
Stephanie Moffitt, Bryan Barnes, Thomas A. Germer, Steven Grantham, Eric Shirley, Martin Sohn, Daniel Sunday, Charles S. Tarrio
Semiconductor devices are noted for ever-decreasing dimensions but now are also becoming more complex. While scanning probe microscopy can still resolve the smallest features, it does not have the throughput for high-volume characterization of full wafers

Debye-Waller Effects in Bethe-Salpeter Calculations

March 3, 2024
Author(s)
Eric Shirley, Joseph Woicik
We present a method to incorporate Debye-Waller effects on core-excitation spectra in methods other than real-space multiple scattering formulations. The method draws ideas from multiple-scattering theory to realize effects of variations in interatomic

Lattice vibrations and the energy landscape of the isoelectronic semiconductor series CuBr, ZnSe, GaAs, and Ge: The special case of CuBr and its d-level chemistry

November 9, 2023
Author(s)
Joseph Woicik, Eric J. Cockayne, Eric L. Shirley, Igor Levin, Conan Weiland, Bruce D. Ravel, A. M. Milinda Abeykoon
We have examined the lattice vibrations and the energy landscape of the isoelectronic diamond and zincblende semiconductor series CuBr, ZnSe, GaAs, and Ge. Vibrations are found to be an increasing function of ionicity, with the cation sublattice always

Core-hole potentials and related effects

January 12, 2022
Author(s)
Eric L. Shirley, Lars G. Pettersson, D. Prendergast
We consider the constrained-occupancy and (linear-response) self-consistent-field methods for screening of core-hole potentials that affect core excitation near-edge spectra. The methods are not exact, but each has distinct advantages and limitations. The

Noble-metal dark-edge fermiology: core-hole memory and the "Zeeman Auger" effect

January 12, 2022
Author(s)
Eric L. Shirley, Joseph Woicik, Conan Weiland, Ahmed Rumaiz, Charles Cardot, Joshua Kas, John Rehr
Gold and platinum have the face-centered-cubic crystal structure, are considered noble metals, and differ by one in atomic number. Near-edge M4,5 x-ray absorption and resonant M4,5N6,7N6,7 Auger spectroscopy reveal "dark" edges and a photon-energy

Dielectric Function of Wurtzite GaN and AIN Thin Films

October 12, 2021
Author(s)
L X. Benedict, Eric L. Shirley, T Wethkamp, K Wilmers, C Cobet, N Esser, W Richter, M Cardona
We present measurements and calculations of the dielectric function of wurtzite GaN and AIN. Spectroscopic ellipsometry was used to determine ε (omega) of thin film samples in the energy range from 3 eV to 9.8 eV. Calculations of ε (omega) for the bulk

Multi-Pole Representation of the Dielectric Matrix

October 12, 2021
Author(s)
J A. Soininen, J J. Rehr, Eric L. Shirley
A good approximation for the electron self-energy or the electron quasiparticle properties is needed for an accurate calculation of x-ray absorption spectra. The GW approximation (GWA) has been found to be relatively reliable in predicting the

Soft X-Ray Fluorescence Studies of Solids

October 12, 2021
Author(s)
J A. Carlisle, Steven R. Blankenship, R N. Smith, Eric L. Shirley, L J. Terminello, J J. Jia, T A. Callcott, D L. Ederer
Resonant inelastic x-ray scattering (RIXS) has been observed in many systems above and below their core threshold. Below threshold, inelastic-loss features are observed, which disperse linearly with excitation energy, but as the excitation increases above

X-ray spectroscopic and first principles investigation of lead tungstate under pressure

August 26, 2021
Author(s)
Eric L. Shirley, Eric J. Cockayne, Joseph Woicik, James M. Ablett
High-energy-resolution fluorescence-detected (HERFD) near-edge x-ray absorption fine structure measurements performed at the Pb and W L3 absorption edges has been used to study the pressure dependence of the local atomic structure of PbWO4 from 0 GPa to 22

Blackbody Radiation Noise Broadening of Quantum Systems

April 22, 2021
Author(s)
Eric B. Norrgard, Stephen Eckel, Christopher L. Holloway, Eric L. Shirley
Precision measurements of quantum systems often seek to probe or must account for the interaction with blackbody radiation. Over the past several decades, much attention has been given to AC Stark shifts and stimulated state transfer. For a blackbody in