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Topic Area: Physics

Displaying records 501 to 510 of 774 records.
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501. Optical Microchip Detection of Nuclear Magnetic Resonance
Topic: Physics
Published: 5/4/2008
Authors: M Ledbetter, I Savukov, D Budker, Vishal Shah, Svenja A Knappe, John E Kitching, S Xu, D Michalak, A Pines
Abstract: We demonstrate optical detection of nuclear magnetic resonance on a microchip. A theoretical optimization indicates detection limits that are competitive with that demonstrated by microcoils in high magnetic fields, without requiring superconducting ...

502. NIST Physics Laboratory: Technical Activities Report (2005-2007)
Series: Special Publication (NIST SP)
Report Number: 1075
Topic: Physics
Published: 5/1/2008
Authors: William R Ott, Jonathan E Hardis

503. Shear Thinning Near the Critical Point of Xenon
Topic: Physics
Published: 4/17/2008
Authors: Robert F Berg, Michael R Moldover, M Yao, G A Zimmerli
Abstract: We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < {gamma}{tau} < 700, where {gamma}{tau} is the shear rate scal ...

504. Optical Lattice Induced Light Shifts in a Yb Atomic Clock
Topic: Physics
Published: 3/14/2008
Authors: Zeb Barber, Jason Stalnaker, Nathan D. Lemke, Christopher W Oates, Tara Michele Fortier, Scott A Diddams, Leo W. Hollberg, C Hoyt
Abstract: We present an experimental study of the lattice induced light shifts on the $^1S_0\rightarrow\,^3P_0$ clock transition of ytterbium. The ``magic'' frequency for the $^{174}$Yb isotope was determined to be $u_{magic} = 394\,799\,475(35)$MHz. The diffe ...

505. Large-scale MCHF Calculation of the Li I 4d-4f Energy Separation
Topic: Physics
Published: 11/1/2007
Authors: Yuri Ralchenko, Charlotte Fischer
Abstract: The calculational methods in atomic structure are currently capable of providing the level of accuracy close to that of the most precise experiments. The multiconfiguration Hartree-Fock method is applied to calculation of the 4d--4f energy difference ...

506. Passive Cooling of a Micromechanical Oscillator with a Resonant Electric Circuit
Topic: Physics
Published: 9/28/2007
Authors: Kenton R. Brown, Joseph Wright Britton, Ryan Epstein, John Chiaverini, Dietrich G Leibfried, David J Wineland
Abstract: Currently there is considerable interest in the cooling of macroscopic mechanical oscillators, as strong cooling may allow one to reach the quantum regime of such oscillators. Recent advances in microfabrication and cooling techniques have brought th ...

507. Lattice-based optical clock using an even isotope of Yb
Topic: Physics
Published: 9/12/2007
Authors: Zeb Barber, C Hoyt, Jason Stalnaker, Nathan D. Lemke, Christopher W Oates, Tara Michele Fortier, Scott A Diddams, Leo W. Hollberg
Abstract: We describe progress toward an optical lattice clock based on an even isotope of Yb. The 1S_0 - P_0 clock resonance in 174Yb is accessed using a magnetically induced spectroscopic technique. Using ~1 mT static magnetic fields and ~10 uW of probe ligh ...

508. Frequency-Tunable Josephson Junction Resonator for Quantum Computing
Topic: Physics
Published: 6/23/2007
Authors: Kevin Osborn, Joshua Strong, Adam Joseph Sirois, Raymond Wiley Simmonds
Abstract: We have fabricated and measured a high-Q Josephson junction resonator with a tunable resonance frequency. A dc magnetic flux allows the resonance frequency to be changed by over 10%. Weak coupling to the environment allows a quality factor of 7000 in ...

509. Optical Fiber Vibration and Acceleration Model
Topic: Physics
Published: 5/29/2007
Authors: Neil Ashby, David Allan Howe, Jennifer A. Taylor, Archita Hati, Craig W Nelson
Abstract: We derive expressions for the group velocities of transverse electric and transverse magnetic electromagnetic waves in a stretched single-mode fiber. Stretching can occur either as a result of temperature changes of the spool on which the fiber is wo ...

510. Self-Injection Locking of a Low-Power Microwave Oscillator by Using 4-Wave Mixing in an Atomic Vapor
Topic: Physics
Published: 5/29/2007
Authors: Alan Brannon, Vladislav Gerginov, V Shah, Svenja A Knappe, Z Popovic, Leo W. Hollberg, John E Kitching
Abstract: We demonstrate self-injection locking of a compact microwave oscillator by using feedback generated from four-wave mixing in an atomic vapor. The four-wave mixing process creates an effective microwave filter with extremely high off-resonant signal s ...

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