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Topic Area: Physics

Displaying records 31 to 40 of 631 records.
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31. 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://nist.gov/manuscript-publication-search.cfm?pub_id=912155

32. 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://nist.gov/manuscript-publication-search.cfm?pub_id=911986

33. Simulating Quantum Magnetism with Correlated Non-Neutral Ion Plasmas
Topic: Physics
Published: 8/27/2012
Authors: John J Bollinger, Joseph Wright Britton, Brian C Sawyer
Abstract: By employing forces which depend on the internal atomic state (or spin) of an atomic ion, the Coulomb potential energy of a strongly coupled array of ions can be modified in a spin-dependent way to mimic effective quantum spin Hamiltonians. Both ferr ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=912704

34. 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. 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://nist.gov/manuscript-publication-search.cfm?pub_id=911519

35. Optical isolator using an atomic vapor in the hyperfine Paschen-Back regime
Topic: Physics
Published: 8/15/2012
Authors: Svenja A Knappe, L. Weller, K.S. Kleinbach, M.A. Zentile, I.G. Hughes, C.S. Adams
Abstract: A light, compact optical isolator using an atomic vapor in the hyperfine Paschen-Back regime is presented. Absolute transmission spectra for experiment and theory through an isotopically pure 87Rb vapor cell show excellent agreement for fields of 0.6 ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=911632

36. 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://nist.gov/manuscript-publication-search.cfm?pub_id=911480

37. Calibration uncertainty for the NIST PM/AM noise standards
Series: Special Publication (NIST SP)
Report Number: 250-90
Topic: Physics
Published: 7/31/2012
Authors: Archita Hati, Craig W Nelson, Neil Ashby, David Allan Howe
Abstract: NIST provides an on-site calibration service of the accuracy of phase modulation (PM) noise, amplitude modulation (AM) noise and noise floor of the measurement systems at a customer's site using one or more portable PM/AM secondary noise standards. I ...
http://nist.gov/manuscript-publication-search.cfm?pub_id=909758

38. 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 T. 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://nist.gov/manuscript-publication-search.cfm?pub_id=911396

39. 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://nist.gov/manuscript-publication-search.cfm?pub_id=910775

40. 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://nist.gov/manuscript-publication-search.cfm?pub_id=911194