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Physics

Atomic/molecular/quantum

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Displaying 576 - 600 of 743

Optimized superconducting detectors using the proximity effect in Ti/TiN multilayers

June 14, 2013
Author(s)
David P. Pappas, Michael Vissers, Jiansong Gao, Martin O. Sandberg, David S. Wisbey, Kent D. Irwin
We apply the superconducting proximity effect in TiN/Ti multi-layers films to tune the critical temperature, $T_C$ (to within 10 mK) with high uniformity (less than 15 mK spread) across a 75 mm wafer. Reproducible $T_C$'s are obtained from 0.8 - 2.5 K

Bell violation using entangled photons without the fair-sampling assumption

April 14, 2013
Author(s)
Marissa Giustina, Alexandra Mech, Sven Ramelow, Bernhard Wittman, Johannes Keffler, Joern Beyer, Adriana Lita, Thomas Gerrits, Sae Woo Nam, Rupert Ursin, Anton Zeilinger, Brice R. Calkins
The violation of a Bell inequality is an experimental observation that forces the abandonment of a local realistic viewpoint - namely, one in which physical properties are (probabilistically) defined before and independently of measurement, and in which no

Soliton dynamics of an atomic spinor condensate on a Ring Lattice

March 6, 2013
Author(s)
Indubala I. Satija, Carlos L. Pando L., Eite Tiesinga
We study the dynamics of macroscopically-coherent matter waves of an ultra-cold atomic spin-1 or spinor condensate on a ring lattice of six sites and demonstrate a novel type of spatio-temporal internal Josephson effect. Using a discrete solitary mode of

Cavity optomechanics with sub-wavelength grating mirrors

December 18, 2012
Author(s)
Utku Kemiktarak, Mathieu Durand, Michael Metcalfe, John R. Lawall
We design, fabricate, and study a novel platform for cavity optomechanics: a silicon nitride membrane patterned as a sub-wavelength diffraction grating. Using the grating as one mirror of a Fabry-Perot cavity, we realize an optical finesse of $F=2830\pm 60

The Infrared Spectrum of HOOH+ Trapped in Solid Neon

October 12, 2012
Author(s)
Warren E. Thompson, Catherine L. Lugez, Marilyn E. Jacox
When a Ne:H2O2 mixture is codeposited at 4.3 K with a beam of neon atoms that have been excited in a microwave discharge, three new, photosensitive absorptions appear which can be assigned to the three infrared-active fundamentals of trans-HOOH+. When the

Interstellar Carbodiimide (HNCNH) - A New Astronomical Detection from the GBT PRIMOS Survey via Maser Emission Features

October 1, 2012
Author(s)
Brett A. McGuire, Ryan A. Loomis, Cameron M. Charness, Geoffery A. Blake, Jan M. Hollis, Francis J. Lovas, Philip R. Jewell, Anthony J. Remijan
Historically, searches for new astronomical molecules resulted in the detection of favorable, high line strength transitions based on a thermal approximation to the excitation of these species in interstellar environments. Given the temperatures of hot

Anisotropy induced Feshbach resonances in a quantum dipolar gas of magnetic atoms.

September 7, 2012
Author(s)
A Petrov, Svetlana A. Kotochigova, Eite Tiesinga
We explore the anisotropic nature of Feshbach resonances in the collision between ultracold magnetic submerged-shell dysprosium atoms, which can only occur due to couplings to rotating bound states. This is in contrast to well-studied alkali-metal atom

Solution-phase and Magnetic Approach Towards Understanding Iron Gall Inks

August 13, 2012
Author(s)
Harshita Kumari, Steven R. Kline, Cindi L. Dennis, Andrew V. Mossine, Rick L. Paul, Carol A. Deakyne, Jerry L. Atwood
Crystallization of compounds of iron with polyphenols, such as iron gall inks, has been an ongoing challenge. As with iron-gall inks, iron complexes of 1,2,3-trihydroxphenol-containing marocycles have also proved difficult to crystallize. Despite this

Towards One-electron Ions in Rydberg States for Laser Spectroscopy

July 30, 2012
Author(s)
Joseph Tan, Samuel Brewer, Nicholas D. Guise
Simple quantum systems play important roles in the determination of fundamental constants. Very recently at NIST, bare nuclei created in an EBIT were extracted and captured in a novel compact Penning trap. This is a step towards production of one-electron

Highly Charged Ions in Rare Earth Permanent Magnet Penning Traps

July 13, 2012
Author(s)
Nicholas D. Guise, Samuel Brewer, Joseph Tan
A newly constructed apparatus at the United States National Institute of Standards and Technology (NIST) is designed for the isolation, manipulation, and study of highly charged ions. Highly charged ions are produced in the NIST electron-beam ion trap

Time-Resolved Vibrational Spectroscopy of [FeFe-Hydrogenase Model Compounds

May 21, 2012
Author(s)
Edwin Heilweil, Christopher J. Stromberg
Fe2(μ-S2C3H6)(CO)6 is a model compound found to mimic the active site structure of the [FeFe]-hydrogenases. To observe the time-dependent behavior of this molecule, ultrafast ultraviolet (UV) or visible excitation with infrared (IR) probe measurements of
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