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Displaying records 11 to 20 of 214 records.
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11. Advances in Coherent Population Trapping for Atomic Clocks
Topic: Physics
Published: 8/10/2010
Authors: John E Kitching, Vishal Shah
Abstract: We review advances in the field of coherent population trapping (CPT) over the last decade with respect to the application of this physical phenomenon to atomic frequency references. We provide an overview of both the basic phenomenon of coherent pop ...

12. Alpha-Dot or Not: Comparison of Two Single Atom Optical Clocks
Topic: Physics
Published: 10/5/2008
Authors: Till P Rosenband, David Hume, Chin W. Chou, J.C. Koelemeij, A. Brusch, Sarah Bickman, Windell Oskay, Tara Michele Fortier, Jason Stalnaker, Scott A Diddams, Nathan Reynolds Newbury, William C Swann, Wayne M Itano, David J Wineland, James C Bergquist
Abstract: Repeated measurements of the frequency ratio of Hg^u+^ and Al^u+^ single-atom optical clocks over the course of a year yield a constraint on the possible temporal variation of the fine-structure constant a. The time variation of the measured ratio c ...

13. Atomic Physics in Ion Traps
Topic: Physics
Published: 3/1/1997
Authors: C Monroe, John J Bollinger
Abstract: Ion traps allow researchers to control the position and movement of charged particles with exquisite precision, and provide a powerful way to study many atomic phenomena.

14. Band Alignment of Metal-Oxide-Semiconductor Structure by Internal Photoemission Spectroscopy and Spectroscopic Ellipsometry
Topic: Physics
Published: 12/10/2010
Authors: Nhan V Nguyen, Oleg A Kirillov, John S Suehle
Abstract: In this paper, we will provide an overview of the internal photoemission (IPE) and the significance of this technique when combined with spectroscopic ellipsometry (SE) to investigate the interfacial electronic properties of heterostructures. In ...

15. CODATA Recommended Values of the Fundamental Physical Constants: 2010
Topic: Physics
Published: 3/1/2012
Authors: Peter J Mohr, Barry Norman Taylor, David B Newell
Abstract: This paper give the 2010 self-consistent set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA) for international use. The 2010 adjustment takes in ...

16. Carbon nanotube arrays for absolute IR and THz radiometry
Topic: Physics
Published: 10/2/2011
Authors: John H Lehman, Kerry N. Betz, Erich N Grossman
Abstract: We have assembled and evaluated a novel electrically calibrated thermopile having an array of 1.5 mm long multiwalled carbon nanotubes as the radiation absorber. We find very low reflectance at the 390 {mu}m laser wavelength and excellent agreeme ...

17. Challenges in SIM to Create a Coordination Program for Time and Frequency
Topic: Physics
Published: 7/26/2010
Authors: J. Mauricio Lopez-Romero, Michael A Lombardi
Abstract: The Sistema Interamericano de Metrologia (SIM), one of the world s five major regional metrology organizations (RMOs) recognized by the Bureau International des Poids et Mesures (BIPM), is comprised of national metrology institutes (NMIs) located in ...

18. Characterization and Calibration of an Optical Time Domain Reflectometer Calibrator
Topic: Physics
Published: 8/23/2006
Authors: Donald R Larson, Nicholas G Paulter Jr., Kenneth C Blaney
Abstract: We report the results of an investigation into the signal characteristics and behavior of an instrument used to calibrate Optical Time Domain Reflectometers. This instrument implements the Telecommunications Industry Association standard TIA/EIA-455- ...

19. Characterization of Soluble Anthradithiophene Derivatives
Topic: Physics
Published: 3/18/2010
Authors: Brad Conrad, Calvin Chan, Marsha A. Loth, John E Anthony, David J Gundlach
Abstract: We will discuss the growth and electrical measurements of a newly developed, partially fluorinated anthradithiophene (F-ADT) derivative with tert-butyldiphenylsilyl (TBDMS) side groups. Single crystals of the material can be readily grown and device ...

20. Characterization of a Soluble Anthradithiophene Derivative
Topic: Physics
Published: 10/1/2010
Authors: Brad Conrad, Calvin Chan, Marsha A. Loth, Sean R Parkin, Xinran Zhang, John E Anthony, David J Gundlach
Abstract: The structural and electrical properties of a new solution processable material, 2,8-diflouro-5,11-tert-butyldimethylsilylethynl anthradithiophene (TBDMS), were measured for single crystal and spun cast thin-film transistors. TBDMS is observed to rea ...

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