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NIST Authors in Bold

Displaying 526 - 550 of 672

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

Effective multibody interactions of harmonically confined ultracold neutral bosons

March 21, 2012
Author(s)
Philip Johnson, W F. Flynn, D Blume, X Y. Yin, Eite Tiesinga
We use renormalized perturbation theory to calculate effective two-, three-, and four-body interactions for N neutral ultracold bosons in the ground state of an isotropic harmonic trap, assuming only two-body interactions modeled with a zero-range

Penning traps with unitary architecture for storage of highly charged ions

February 15, 2012
Author(s)
Joseph N. Tan, Samuel M. Brewer, Nicholas D. Guise
Penning traps are made extremely compact by embedding rare-earth permanent magnets in the electrode structure. Axially-oriented NdFeB magnets are used to produce 0.32 T for ion trapping in unitary architectures that functionally couple the electric and

Semiclassical fifth virial coefficients for improved ab initio helium--4 standards

February 15, 2012
Author(s)
Katherine Shaul, Andrew Schultz, David A. Kofke, Michael R. Moldover
For helium-4, we present ab initio, semi-classical calculations of virial coefficients Bn for for n = 2, 3, 4, and 5 from 50 K to 1000 K. Using our values of B4 and B5 and the more accurate literature values of B2 and B3, we argue that the ab initio virial

Mechanically Compliant Grating Reflectors for Optomechanics

February 10, 2012
Author(s)
Utku Kemiktarak, Michael Metcalfe, Mathieu Durand, John R. Lawall
We demonstrate micromechanical reflectors with a reflectivity as large as 99.4% and a mechanical quality factor Q as large as 7.8 x 10^5 for optomechanical applications. The reflectors are silicon nitride membranes patterned with sub-wavelength grating

Extension and new level optimization of the Ne IV spectrum

January 13, 2012
Author(s)
Alexander Kramida, C M. Brown, Uri Feldman, Joseph Reader
Spectra of Ne emitted by a Penning discharge were recorded in the extreme ultraviolet (EUV) region between 140 Å and 359 Å on a 10.7 m grazing-incidence spectrograph with phosphor storage image plates. These spectra provided 33 newly identified lines of Ne

Conclusive quantum steering with superconducting transition-edge sensors

January 10, 2012
Author(s)
Devin H. Smith, Marcelo de Almeida, Gillett Geoff, Branciard Cyril, Allesandro Fedrizzi, Weinhold J. Till, Adriana Lita, Brice R. Calkins, Thomas Gerrits, Wiseman H, Sae Woo Nam, Andrew G. White
Quantum steering allows two parties to verify shared entanglement even if one measurement device is untrusted. A conclusive demonstration of steering through the violation of a steering inequality is of considerable fundamental interest and opens up

Populations of excited parabolic states of hydrogen beam in fusion plasmas

January 1, 2012
Author(s)
Oleksandr Marchuk, Yuri Ralchenko
The injection of a neutral beam into the core of magnetically confined plasmas is a foundation for various plasma diagnostics, including charge-exchange recombination spectroscopy, beam-emission spectroscopy and motional Stark effect diagnostics. We review

The Infrared Spectrum of NN...CO+ Trapped in Solid Neon

December 15, 2011
Author(s)
Warren E. Thompson, Marilyn E. Jacox
Codeposition of a Ne:N2:CO = 200:1:1 mixture at 4.3 K with a beam of very pure neon atoms excited to their energy levels between 16.6 and 16.85 eV leads to stabilization in the resulting solid of sufficient NNCO+ for detection of its NN- and CO-stretching

Unification of universal and non-universal topological quantum computation

July 26, 2011
Author(s)
Haitan Xu, Jacob Taylor
Approaches for implementing primitives for quantum computation using Read-Reyazi anyons remain computational difficult to find. We demonstrate how recently discovered approaches, including composition of anyons and deconstruction of many-qubit operations

Quantum superposition of a single microwave photon in two different colour states

July 3, 2011
Author(s)
Eva A. Zakka-Bajjani, Francois E. Nguyen, Minhyea Lee, Leila R. Vale, Raymond Simmonds, Joe Aumentado
The ability to manipulate photonic states is an important tool for quantum information processing. In cavity quantum electrodynamics (QED), coupling between bosonic modes has, until now, required a qubit to mediate the interaction. As an alternative, it is
Displaying 526 - 550 of 672
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