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Journals

Improved Performance of Schottky Diodes on Pendeo-Epitaxial Gallium Nitride

September 1, 2008

Author(s)

Lawrence H. Robins, T Zheleva, M Derenge, D Ewing, P Shah, K Jones, U Lee

We designed experiments to investigate the role of the dislocation density on the performance of Schottky diodes fabricated on GaN material grown conventionally...

The Use of GPS Disciplined Oscillators as Primary Frequency Standards for Calibration and Metrology Laboratories

September 1, 2008

Author(s)

Michael A. Lombardi

An increasing number of calibration and metrology laboratories now employ a Global Positioning System disciplined oscillator (GPSDO) as their primary standard...

Through-focus scanning optical microscope imaging method for nano-scale dimensional analysis

September 1, 2008

Author(s)

Ravikiran Attota, Richard M. Silver

We present a novel optical technique that produces nanometer dimensional measurement sensitivity using a conventional bright-field optical microscope, by...

Modeling of Photochemical Reactions in a Focused Laser Beam, II

September 1, 2008

Author(s)

Adolfas K. Gaigalas, Fern Y. Hunt, Lili Wang

A method is described for obtaining rate constants of photodegradation process of fluorophores illuminated by a focused laser beam. The explicit kinetic...

NIST Evaluates Fire Service Positive Pressure Ventilation Tactics In a Retired Educational Building

September 1, 2008

Author(s)

Stephen Kerber

Contributions of First-Principles Calculations to Understanding Structure-Property Relationships in Perovksites

September 1, 2008

Author(s)

Eric J. Cockayne

Method to Determine Collection Efficiency of Particles by Swipe Sampling

September 1, 2008

Author(s)

Jennifer R. Verkouteren, Jessica L. Staymates, Robert A. Fletcher, Wayne Smith, George A. Klouda, John G. Gillen

A methodology was developed to evaluate particle collection efficiencies from swipe sampling of trace residues. Swipe sampling is used for many applications...

Quantification of Hydroxyl Content in Ceramic Oxides: A PGAA Study of BaTiO3

September 1, 2008

Author(s)

Rick L. Paul, Vahit Atakan, Chun-Wei Chen, Richard E. Riman

Thermo-gravimetric analysis (TGA) and Fourier Transform Infrared Spectroscopy (FTIR) techniques for water content determination were compared with a neutron...

Studies of the Distribution of Elementary Threading Screw Dislocations In 4H Silicon Carbide Wafer

September 1, 2008

Author(s)

David R. Black, Ning Zhang, M Dudley, X Huang, Y Chen

The density and sense distribution of elementary threading screw dislocations in a physical vapor transport grown 3-inch 4H silicon carbide wafer have been...

The effect of interfacial roughness on the thin film morphology and charge transport of high performance polythiphenes

September 1, 2008

Author(s)

Yeon-Gil Jung, Regis J. Kline, Daniel A. Fischer, Eric K. Lin, Martin Heeney, Iain McCulloch

An Accurate Capacitance-Voltage Measurement Method for Highly Leaky Devices

September 1, 2008

Author(s)

Yun Wang, Kin P. Cheung, Y.J. Choi, Byoung Hun Lee

Accurate CV measurement becomes extremely difficult in advanced CMOS technology due to high level of leakage across the gate dielectric. Recently, a new Time...

A Performance Evaluation of 90Y Dose Calibrator Measurements in Nuclear Pharmacies and Clinics in the United States

September 1, 2008

Author(s)

M K. Schultz, Jeffrey T. Cessna, J P. Norenberg, Tyler Anderson, J A. Ponto, N Petry, R J. Kowalsky, M R. Palmer, U F. Beinlich, C R. Divgi

Delocalized Correlations in Twin Light Beams with Orbital Angular Momentum

August 29, 2008

Author(s)

Alberto M. Marino, Vincent Boyer, Raphael C. Pooser, Paul D. Lett, Kristin Lemons, Kevin Jones

We generate intensity-difference-squeezed Laguerre-Gauss twin beams carrying orbital angular momentum using 4-wave mixing (4WM) in a hot atomic vapor. The...

Input Impedance and Gain of a Gigahertz Amplifer Using a DC SQUID in a Quarter Wave Resonator

August 29, 2008

Author(s)

Lafe F. Spietz, Kent D. Irwin, Jose A. Aumentado

Due to their superior noise performance, SQUIDs are an attractive alternative to high electron mobility transistors for constructing ultra low noise microwave...

Trapped-Ion Quantum Logic Gates Based on Oscillating Magnetic Fields

August 29, 2008

Author(s)

Christian Ospelkaus, Christopher Langer, Jason Amini, Kenton R. Brown, Dietrich G. Leibfried, David J. Wineland

Oscillating magnetic fields and field gradients can be used to implement single-qubit rotations and entangling multi-qubit quantum gates for trapped-ion quantum...

Classification of Microheterogeneity in Solid Samples using µXRF

August 28, 2008

Author(s)

John L. Molloy, John R. Sieber

Micro X-ray Fluorescence (µXRF) has been used to nondestructively investigate elemental heterogeneity by constructing two-dimensional maps of elemental...

Vortex-core states in superfluid Fermi-Fermi mixtures with unequal masses

August 28, 2008

Author(s)

Menderes Iskin

We analyze the vortex-core states of two-species (mass imbalanced) superfluid fermion mixtures as a function of two-body binding energy. In particular, we solve...

Signature of magnetic phase separation in the ground state of Pr 1 − x Ca x MnO 3

August 27, 2008

Author(s)

Hao Sha, F Ye, Pengcheng Dai, J. A. Fernandez-Baca, D Mesa, Jeffrey Lynn, Y Tomioka, Y Tokura, Jiandi Zhang

Neutron scattering has been used to investigate the evolution of long- and short-range charge-ordered (CO), ferromagnetic, and antiferromagnetic (AF)...

Band offsets of atomic-layer-deposited Al2O3 on GaAs and the effects of surface treatment.

August 27, 2008

Author(s)

Nhan V. Nguyen, Oleg A. Kirillov, Weirong Jiang, Wenyong Wang, John S. Suehle, P. D. Ye, Y. Xuan, N. Goel, Kwang-Woo Choi, Wilman Tsai

In this letter we report the band offsets of the Al/Al2O3/GaAs structure determined by internal photoemission and spectroscopic ellipsometry. The energy barrier...

Neutron-scattering study of the oxypnictide superconductor LaFeAsO 0.87 F 0.13

August 26, 2008

Author(s)

Yiming Qiu, M. Kofu, Wei Bao, S.-H. Lee, Qingzhen Huang, Taner N. Yildirim, John R. Copley, Jeffrey Lynn, T. Wu, G. Wu, X. H. Chen

The recently discovered superconductor LaO0.87F0.13FeAs (TC≈26 K) was investigated using the neutron-scattering technique. No spin-density-wave (SDW) order was...

Fast, bias-free algorithm for tracking single particles with variable size and shape

August 26, 2008

Author(s)

Andrew J. Berglund, Matthew D. McMahon, Jabez J. McClelland, James A. Liddle

We introduce a fast and robust technique for single-particle tracking with nanometer accuracy.We extract the center-of-mass of the image of a single particle...

Molecule induced interface states dominate charge transport in Si-alkyl-metal junctions

August 26, 2008

Author(s)

Lam H. Yu, Nadine E. Gergel-Hackett, Christopher D. Zangmeister, Christina A. Hacker, Curt A. Richter, James G. Kushmerick

Abstract. Semiconductor-molecule-metal junctions consisting of alkanethiol mono- layers self-assembled on both p+ and n¡ type highly doped Si(111)wires...

Effects of directed gel degradation and collagenase digestion on the integration of neocartilage produced by chondrocytes encapsulated in hydrogel carriers

August 26, 2008

Author(s)

Mark A. Rice, P. M. Homier, Kendall Waters, Kristi S. Anseth

Chondrocytes were encapsulated in non-degrading and partially degrading PEG gels in apposition to native cartilage layers in order to examine the effects of gel...

Response of polar nanoregions in 68%Pb(Mg1/3Nb2/3)O3-32%PbTiO3 to a [001] electric field

August 25, 2008

Author(s)

Jinsheng Wen, G Xu, C. Stock, Peter M. Gehring

We report neutron diffuse scattering measurements on a single crystal of 68%Pb(Mg1/3Nb2/3)O3- 32%PbTiO3. Strong diffuse scattering is observed at low...

Fractographic Failure analysis of a Procera AllCeram Using Stereo and Scanning Electron Microscopy

August 24, 2008

Author(s)

Susanne Scherrer, George D. Quinn, Janet Quinn

Objectives: Presentation of a methodological approach using stereo and scanning electron microscope examination to failure analysis of an alumina all-ceramic...

Magnetic order of the iron spins in NdFeAsO

August 21, 2008

Author(s)

Ying Chen, Jeffrey Lynn, Jiying Li, G. J. Li, G. F. Chen, J. L. Luo, N. L. Wang, Pengcheng Dai, Clarnia dela Cruz, H. A. Mook

Polarized and unpolarized neutron diffraction measurements have been carried out to investigate the iron magnetic order in undoped NdOFeAs. Antiferromagnetic...

Magneto-Optical-Trap-Based, High Brightness Ion Source for Use as a Nanoscale Probe

August 21, 2008

Author(s)

James L. Hanssen, Shannon B. Hill, Jon Orloff, Jabez J. McClelland

We report on the demonstration of a low emittance, high brightness ion source based on magneto-optically trapped neutral atoms. Our source has ion optical...

Assessing Customer Satisfaction at the NIST Research Library: Essential Tool for Future Planning

August 21, 2008

Author(s)

Rosa Liu, Nancy Allmang

This article describes a campus-wide customer satisfaction survey undertaken by the National Institute of Standards and Technology (NIST) Research Library in...

Characterization of Monolayer Formation on Aluminum-Doped Zinc Oxide Thin Films

August 21, 2008

Author(s)

C Rhodes, S E. Lappi, Daniel A. Fischer, S Sambasivan, Jan Genzer, S Franzen

The optical and electronic properties of aluminum-doped zinc oxide (AZO) thin films on a glass substrate have been investigated experimentally and theoretically...

Hydrogen Storage in a Microporous Metal-Organic Framework with Exposed Mn²⁺ Coordination Sites

August 20, 2008

Author(s)

Mircea Dinca, Anne Dailly, Yun Liu, Craig Brown, Dan A. Neumann, Jeffrey R. Long

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