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Displaying 751 - 775 of 2587

2p x-ray absorption spectroscopy of 3d transition metal systems

April 3, 2021
Author(s)
Eric L. Shirley, John Vinson, Frank de Groot, Hebatalla Elnaggar, Federica Frati, Ru-pan Wang, Mario Delgado, Michel van Veenendaal, Maurits Haverkort, Robert Green, Yaroslav Kvashnin, Atsushi Hariki, Harry Ramanantoanina, Claude Daul, Bernard Delley, Michael Odelius, Marcus Lundberg, Oliver Kuhn, Sergey Bokarev, Keith Gilmore, Mauro Stener, Giovanni Fronzoni, Piero Decleva, Peter Kruger, Marius Retegan, Javier Fernandez-Rodriguez, Gerritt van der Laan, Yves Joly, Christian Vorwerk, Claudia Draxl, John Rehr, Arata Tanaka, Hidekazu Ikeno
A variety of methods are presented that are presently used to treat x-ray absorption spectra of transition-metal 2p edges in a wide range of compounds. Different methods include different methods of chemical realism versus featuring the simplifications of

Evidence Against Carbonization of the Thin-Film Filters of the Extreme Ultraviolet Variability Experiment onboard the Solar Dynamics Observatory

April 1, 2021
Author(s)
Charles Tarrio, Robert F. Berg, Thomas B. Lucatorto, Andrew Jones, Frank Eparvier, Brian Templeman, Donald Woodraska, Marie Dominique
In spite of strict limits on outgassing from organic materials, some spacecraft instruments making long-term measurements of solar extreme ultraviolet (EUV) radiation still suff er signi cant degradation. While such measures have reduced the rate of

Inverse-designed multi-dimensional silicon photonic transmitters

March 25, 2021
Author(s)
Travis Briles, Jordan Stone, Scott Papp
Modern microelectronic processors have migrated towards parallel computing architectures with many-core processors. However, such expansion comes with diminishing returns exacted by the high cost of data movement between individual processors. The use of

Frequency Ratio Measurements with 18-Digit Accuracy Using a Network of Optical Clocks

March 24, 2021
Author(s)
Kyle Beloy, Martha I. Bodine, Tobias B. Bothwell, Samuel M. Brewer, Sarah L. Bromley, Jwo-Sy Chen, Jean-Daniel Deschenes, Scott Diddams, Robert J. Fasano, Tara Fortier, Youssef Hassan, David Hume, Dhruv Kedar, Colin J. Kennedy, Isaac Kader, Amanda Koepke, David Leibrandt, Holly Leopardi, Andrew Ludlow, Will McGrew, William Milner, Daniele Nicolodi, Eric Oelker, Tom Parker, John M. Robinson, Stefania Romisch, Stefan A. Schaeffer, Jeffrey Sherman, Laura Sinclair, Lindsay I. Sonderhouse, William C. Swann, Jian Yao, Jun Ye, Xiaogang Zhang
Atomic clocks occupy a unique position in measurement science, exhibiting higher accuracy than any other measurement standard and underpinning six out of seven base units in the SI system. By exploiting higher resonance frequencies, optical atomic clocks

Fully phase-stabilized 1 GHz turnkey frequency comb at 1.5 mm

March 15, 2021
Author(s)
Daniel Lesko, Alexander Lind, Nazanin Hoghooghi, Abijith S. Kowligy, Henry R. Timmers, Pooja Sekhar, Benjamin Rudin, Florian Emaury, Gregory B. Rieker, Scott Diddams
Low noise and high repetition rate optical frequency combs have been desirable for many applications from timekeeping to precision spectroscopy. With higher power per comb mode, gigahertz repetition rates enable rapid spectroscopic sensing in a dual-comb

A six-octave optical frequency comb from a scalable few-cycle Erbium fiber laser

March 11, 2021
Author(s)
Daniel Lesko, Henry R. Timmers, Sida Xing, Abijith S. Kowligy, Alexander Lind, Scott Diddams
A coherent, compact and robust light source with coverage from the ultraviolet to the infrared is desirable for heterodyne super-resolution imaging1, broadband infrared microscopy2, protein structure determination3 and standoff trace-gas detection4. To

Core-hole processes in photoemission and x-ray absorption by resonant-Auger electron spectroscopy and first-principles theory

March 10, 2021
Author(s)
Eric L. Shirley, Joseph Woicik, Conan Weiland, James M. Ablett, Abdul K. Rumaiz, Michael T. Brumbach, Joshua J. Kas, John J. Rehr
The electron-core-hole interaction is critical for proper interpretation of core-level spectroscopies commonly used as structural tools in materials' science. Resonant Auger- electron spectroscopy can uniquely identify exciton, shake, and charge-transfer

Broadband thermomechanically limited sensing with an optomechanical accelerometer

March 9, 2021
Author(s)
Feng Zhou, Yiliang Bao, Ramgopal Madugani, David Long, Jason J. Gorman, Thomas W. LeBrun
Cavity optomechanics has enabled precision measurements with unprecedented levels of sensitivity, including the detection of attonewton forces, nanoparticles, magnetic fields, and gravitational waves. In most cases, detection is performed in a narrow

Comparative study of multiwall carbon nanotube nanocomposites by Raman, SEM, and XPS measurement techniques

March 3, 2021
Author(s)
Yanmei Piao, Vipin Tondare, Chelsea S. Davis, Justin Gorham, Elijah Petersen, Jeffrey W. Gilman, Keana Scott, Andras Vladar, Angela R. Hight Walker
Substantial ongoing research efforts are investigating the production of novel composite material enhanced by the incorporation of nanomaterial fillers such as multiwall carbon nanotubes (MWCNTs). While the addition of MWCNTs have been shown to improve the

Efficient and low-backaction measurement of a superconducting qubit

March 3, 2021
Author(s)
Eric Rosenthal, Christian M. Schneider, Maxime Malnou, Ziyi Zhao, Felix Leditzky, Benjamin Chapman, Waltraut Wustmann, Xizheng Ma, Daniel A. Palken, Leila R. Vale, Gene C. Hilton, Jiansong Gao, Graeme Smith, Gerhard Kirchmair, Konrad Lehnert

Characterization of waveguide-integrated single-photon detectors using integratedphotonic structures

February 18, 2021
Author(s)
Sonia M. Buckley, Alexander N. Tait, Jeffrey T. Chiles, Adam N. McCaughan, Saeed Khan, Richard Mirin, Sae Woo Nam, Jeffrey M. Shainline
We show several techniques for using integrated-photonic waveguide structures to simultaneously characterize multiple waveguide-integrated superconducting-nanowire detectors with a single fiber input. We demonstrate structures for direct comparison of

A quantum enhanced search for dark matter axions

February 10, 2021
Author(s)
K M. Backes, Daniel A. Palken, S A. Kenany, Benjamin M. Brubaker, S B. Cahn, A Droster, Gene C. Hilton, Sumita Ghosh, H. Jackson, Steve K. Lamoreaux, A. F. Feder, Konrad Lehnert, S M. Lewis, Maxime Malnou, R H. Maruyama, N M. Rapidis, M Simanovskaia, Sukhman Singh, D H. Speller, I Urdinaran, Leila R. Vale, E. C. van Assendelft, K van Bibber, H. Wang

NIST Time and Frequency Bulletin

February 10, 2021
Author(s)
Kelsey A. Rodriguez
The Time and Frequency Bulletin provides information on performance of time scales and a variety of broadcasts (and related information) to users of the NIST services.

Group-velocity dispersion engineering of tantalum pentoxide integrated photonics

February 9, 2021
Author(s)
Jennifer Black, Richelle H. Streater, Kieran F. LaMee, David Carlson, Su P. Yu, Scott Papp
Designing integrated photonics, especially to leverage Kerr-nonlinear optics, requires accurate and precise knowledge of refractive index across the visible to infrared spectral ranges. Tantalum pentoxide (Ta2O5, tantala) is an emerging material platform

National Institute of Standards and Technology Environmental Scan 2020

February 9, 2021
Author(s)
Heather Evans, Kristen K. Greene, William M. Healy, Elizabeth Hoffman, Kate Rimmer, Anna V. Sberegaeva, Neil M. Zimmerman
The 2020 National Institute of Standards and Technology Environmental Scan provides an analysis of key external factors that could impact NIST and the fulfillment of its mission in coming years. The analyses were conducted through four separate lenses
Displaying 751 - 775 of 2587
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