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Topic Area: Physics

Displaying records 1 to 10 of 596 records.
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1. Infrared hemispherical reflectance of carbon nanotube mats and arrays in the 5 µm to 50 µm wavelength region
Topic: Physics
Published: 11/1/2012
Authors: Chris Chunnilall, Aric Warner Sanders, John H Lehman, Evangelos Theocharous
Abstract: We present the absolute infrared (5 {u}m to 50 {u}m) hemispherical reflectance of films produced from commercially available carbon nanotubes. Data were obtained using the upgraded NPL directional- hemispherical reflectance measurement facility. A b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910058

2. Ultrafast manetization enhancement in metallic multilayers driven by superdiffusive spin current
Topic: Physics
Published: 9/4/2012
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Dennis Rudolf, Chan La-O-Vorakiat, Marco Battiato, Roman Adam, Emrah Turgut, Stefan Mathias, Margaret M. Murnane, Henry C. Kapteyn, Claus M. Schneider
Abstract: Uncovering the physical mechanisms that govern ultrafast charge and spin dynamics is crucial for understanding correlated matter as well as the fundamental limits of ultrafast spin-based electronics. Spin dynamics in magnetic materials can be driven ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911061

3. A Sub-Sampling Digital PM/AM Noise Measurement System
Topic: Physics
Published: 9/1/2012
Authors: Craig W Nelson, David Allan Howe
Abstract: A digital phase/amplitude modulation (PM/AM) noise measurement systems (DNMS) implementing field progammable gate array (FPGA) based digital down converters (DDCs), and 250 MHz analog to digital converters (ADCs) is reported. Measurements in the firs ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912155

4. Experimental constraints on the polarizabilities of the 6s^u2^ 1S0 and 6s6p 3P0 states of Yb
Topic: Physics
Published: 8/28/2012
Author: Kyle Patrick Beloy
Abstract: We utilize accurate experimental data available in the literature to yield bounds on the polarizabilities of the ground and first excited states of atomic Yb. For the 6s^u2^ 1S0 ground state, we find the polarizability alpha to be constrained to 134. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911986

5. Coherent Diabatic Ion Transport and Separation in a Multizone Trap Array
Topic: Physics
Published: 8/24/2012
Authors: Ryan Steven Bowler, John P Gaebler, Yiheng Lin, Ting Rei Tan, David Hanneke, John D. (John) Jost, J. Home, Dietrich G Leibfried, David J Wineland
Abstract: We investigate ion motion dynamics during the transport between and separation into spatially distinct trap locations in a multi-zone trap array. We laser-cool a single $\ensuremath{^{9}{\rm {Be}^{+}}}$ ion held in a linear Paul trap to near its grou ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911519

6. Mid-infrared virtually imaged phased array spectrometer for rapid and broadband trace gas detection
Topic: Physics
Published: 8/1/2012
Authors: Lora L Nugent-Glandorf, Tyler W. Neely, Florian B. (Florian) Adler, Adam J. Fleisher, Kevin C Cossel, Bryce Bjork, Tim P Dinneen, Chris S Wood, Jun Ye, Scott A Diddams
Abstract: We present and analyze a 2-D imaging spectrometer based on a virtually imaged phased array (VIPA) disperser for rapid, high-resolution molecular detection using mid-infrared (MIR) frequency combs. A broad bandwidth, MIR laser source centered at ~3.1 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911480

7. Determination of graphene work function and graphene-insulator-semiconductor band alignment by internal photoemission spectroscopy
Topic: Physics
Published: 7/11/2012
Authors: Rusen Yan, Qin Zhang, Wei Li, Irene G. Calizo, Tian (Tian) Shen, Curt A Richter, Angela R Hight Walker, Xuelei X. Liang, David J Gundlach, Nhan V Nguyen, Huili Grace Xing, Alan Seabaugh
Abstract: We determined the band alignment of a graphene-oxide-silicon structure using internal photoemission spectroscopy. From the flatband voltage and Dirac voltage we infer a 4.3  10e11 cm-2 negative extrinsic charge present on the graphene surface. Als ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911396

8. Propagation of Vortex Electron Wave Functions in a Magnetic Field
Topic: Physics
Published: 7/5/2012
Authors: Gregg M Gallatin, Ben McMorran
Abstract: The physics of coherent beams of photons carrying axial orbital angular momentum (OAM) is well understood and such beams, sometimes known as vortex beams, have found applications in optics and microscopy. Recently electron beams carrying very large ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910775

9. 100 Years of Superconductivity
Topic: Physics
Published: 7/2/2012
Author: Richard Lloyd Kautz
Abstract: The 100th anniversary of the discovery of superconudctivity by Heike Kamerlingh Onnes was celebrated in 2011 at the Superconductivity Centennial Conference held in The Hague. 100 Years of Superconductivity is a product of that celebration, but it's f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911194

10. In-situ Polarized 3He system for the Magnetism Reflectometer at the Spallation Neutron Source
Topic: Physics
Published: 7/2/2012
Authors: Thomas R. Gentile, X Tong, C Y Jiang, V Lauter, H. Ambaye, D. Brown, L Crow, R J Goyette, W-T Lee, A. Parizzi
Abstract: We report on the in-situ polarized 3He neutron polarization analyzer developed for the time-of-flight Magnetism Reflectometer (MAGICS) at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). Using the spin exchange optical ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911438