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NIST Authors in Bold

Displaying 176 - 200 of 473

Frequency ratio of Al + and Hg + single-ion optical clocks; metrology at the 17th decimal place

March 6, 2008
Author(s)
Till P. Rosenband, David Hume, P. O. Schmidt, Chin-Wen Chou, Anders Brusch, Luca Lorini, Windell Oskay, Robert E. Drullinger, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, Nathan R. Newbury, W Swann, Wayne M. Itano, David J. Wineland, James C. Bergquist
… the fine-structure constant α of α-dot / α = (1.4{= or -}1.7)X 10 -17 /year. The ratio of aluminum and mercury optical … clock frequencies Ņ Al+ /Ņ Hg+ is 1.052 871 833 148 990 48(6), where the uncertainty comprises a statistical …

A Clock Ensemble Using Only Active Hydrogen Masers

January 31, 2017
Author(s)
Thomas E. Parker, Stefania Romisch
The current real-time timescale at NIST, AT1, as well as the post-processed scale TP162, both contain hydrogen masers and commercial cesium frequency standards. The cesium standards are much nosier in the short term than the hydrogen masers and

Trapped-ion optical atomic clocks at the quantum limits

January 31, 2017
Author(s)
David R. Leibrandt, Samuel M. Brewer, Jwo-Sy Chen, Aaron M. Hankin, David B. Hume, David J. Wineland, Chin-Wen Chou
Frequency and its inverse, time, are the most accurately measured quantities. Historically, improvements in the accuracy of clocks have enabled advances in navigation, communication, and science. Since 1967, the definition of the SI second has been based

Intertwined Charge and Spin Density Waves in a Topological Kagome Material

July 22, 2024
Author(s)
Y. Chen, Jonathan N. Gaudet, G. Marcus, T. Nomoto, T. Chen, T. Tomita, M. Ikhlas, H. Suzuki, Yang Zhao, Wangchun Chen, J. Strempfer, R. Arita, S. Nakatsuji, Collin L. Broholm
… locking to commensurate values of kβ = 1 12 c∗ and kχ = 5 48 c∗ at low T. Density functional theory indicates this …

Under-reporting of greenhouse gas emissions in U.S. cities

February 2, 2021
Author(s)
Kimberly Mueller, Kevin R. Gurney, Thomas Lauvaux, Geoffrey Roest, Jianming Liang, Yang Song
… consistent with atmospheric measurements, is compared to 48 U.S. city SRIs. We find a mean relative difference (RD) of …

In-situ Stress Measurements During Cobalt Electrodeposition on (111)-Textured Au

April 14, 2016
Author(s)
Gery R. Stafford, Matthew R. Fayette, Ugo Bertocci
Cantilever curvature was used to examine stress generation during the electrodeposition of Co from 0.1 M NaClO4 + 0.001 M Co(ClO4)2 (pH = 4.8) in films measuring less than 100 nm in thickness. The stress-thickness product showed a -0.2 N/m compression in

Neutron Scattering Studies of the Ferroelectric Distortion and Spin Dynamics in the Type-1 Multiferroic Perovskite Sr 0.56 Ba 0.44 MnO 3

October 9, 2014
Author(s)
Daniel K. Pratt, Jeffrey W. Lynn, James Mais, Omar Chmaissem, Dennis E. Brown, Stanislaw Kolesnik, Bogdan Dabrowski
The magnetic order, spin dynamics, and crystal structure of the multiferroic Sr 0.56Ba 0.44MnO 3 have been investigated using neutron and x-ray scattering. Ferroelectricity develops at T c=305 K with a polarization of 4.2 υC/cm 2 associated with the

Conclusive quantum steering with superconducting transition-edge sensors

January 10, 2012
Author(s)
Devin H. Smith, Marcelo de Almeida, Gillett Geoff, Branciard Cyril, Allesandro Fedrizzi, Weinhold J. Till, Adriana Lita, Brice R. Calkins, Thomas Gerrits, Wiseman H, Sae Woo Nam, Andrew G. White
… with the minimal number of measurement settings by 48 s.d.s. Our results provide a clear path to practical …
Displaying 176 - 200 of 473
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