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Search Publications

NIST Authors in Bold

Displaying 5451 - 5475 of 13218

The growth of self-intercalated Nb1+xSe2 by molecular beam epitaxy: The effect of processing conditions on the structure and electrical resistivity

June 8, 2023
Author(s)
Peter Litwin, Samantha Jaszewski, Wendy Sarney, Asher Leff, Sergiy Krylyuk, Albert Davydov, Jon Ihlefeld, Stephen McDonnell
… indicate that flux ratios of 5:1 and greater result in the growth of the Nb1+xSe2 phase and that the amount of … an inverse relationship between flux ratio and resistivity in the grown Nb1+xSe2 thin films. Another Nb-Se compound with … was synthesized using a Se to Nb flux ratio of 2:1; in contrast to the Nb1+xSe2 thin films, this compound did not …

Measurements and model of UV-induced oxidation of aluminum

March 22, 2023
Author(s)
Robert F. Berg, Charles S. Tarrio, Thomas B. Lucatorto
… radiation onto a polycrystalline aluminum membrane in the presence of water vapor at pressures from 3×10-8 mbar … from the Al metal, electron-phonon scattering in the oxide, Al3+ ion transport in the oxide, and the adsorption and ionization of H2O on the … Journal of Vacuum Science & Technology A …

Communicating Confidence of Per- and Polyfluoroalkyl Substance (PFAS) Identification via High Resolution Mass Spectrometry

May 26, 2022
Author(s)
Joseph Charbonnet, Carrie McDonough, Feng Xiao, Trever Schwichtenberg, Dunping Cao, Sarit Kaserzon, Kevin Thomas, Pradeep Dewapriya, Benjamin Place, Emma Schymanski, Jennifer Field, Damian Helbling, Christopher Higgins
… common for the discovery and identification of PFASs in environmental and biological samples. The certainty of … with general criteria for communicating confidence in the identification of small organic molecules by HRMS … but incorporates the specific conventions and tools used in PFAS classification and analysis (e.g., the detection of …

Identification of an analytical method interference for perfluorobutanoic acid in biological samples

December 31, 2021
Author(s)
Jacqueline Bangma, Jessica Reiner, Rebecca Fry, Tracey Manuck, James McCord, Mark Strynar
… of per- and polyfluorinated alkyl substances (PFAS) in environmental and biological samples relies on both high- … acid (PFBA) is one of the smaller PFAS observed in biological and environmental samples and has only one … laboratories undertook a targeted investigation into PFAS in the human placenta from high-risk pregnancies utilizing …

Advances in Magnetometry Through Miniaturization

October 12, 2021
Author(s)
A Edelstein, J Burnette, Greg Fischer, S F. Cheng, William F. Egelhoff Jr., Robert McMichael, E Nowak
… the effect of 1/f noise, the MEMS flux concentrator. In the chip scale atomic magnetometer researchers have been … optics, heater, optical cell, and photodiode detector in a stack that passes through a silicon wafer. Theoretical … of magnetoresistance values of 400% at room temperature in magnetic tunnel junctions with MgO barriers. The large …

Elastic Modulus Measurements in Plasma Sprayed Deposits

October 12, 2021
Author(s)
Jay S. Wallace, J Ilavsky
… to calculate the elastic modulus. Since the loads used are in the elastic region, the technique is, in theory, nondestructive. Relatively small areas of the material, approximately 50 (micro)m in diameter, are sampled by the indenter, allowing local … Journal of Thermal Spray Technology …

Recommended Practice for Calibrating Vacuum Gauges of the Thermal Conductivity Type

October 12, 2021
Author(s)
R E. Ellefson, A P. Miiller
… calibrating vacuum gauges of the thermal conductivity type in the pressure range 10 -1 Pa (10 -3 Torr) to 10 5 Pa (760 … recommended choices for this calibration. Good practices in the usage of thermal conductivity gauges are discussed and … Journal of Vacuum Science and Technology A …

Science for Stewardship: Multidisciplinary Research on the USS Arizona

October 12, 2021
Author(s)
Matthew A. Russell, L E. Murphy, D L. Johnson, Timothy J. Foecke, Pamela J. Morris, R Mitchell
… processes affecting the deterioration of the USS Arizona in Peal Harbor, Hawaii. The USS Arizona Preservation Project … Marine Technology Society Journal …

PHIDL: Python-based layout and geometry creation for nanolithography

September 27, 2021
Author(s)
Adam McCaughan, Alexander N. Tait, Sonia Buckley, Jeff Chiles, Jeff Shainline, Sae Woo Nam, Dylan M. Oh
… Computer-aided design (CAD) has become a critical element in the creation of nanopatterned structures and devices. In particular, with the increased adoption of easy-to-learn … languages like python, there has been a significant rise in the amount of lithographic geometries generated through …

Machine-learning enhanced dark soliton detection in Bose-Einstein condensates

June 15, 2021
Author(s)
Shangjie Guo, Amilson R. Fritsch, Ian Spielman, Justyna Zwolak
… Most data in cold-atom experiments comes from images, the analysis of … our preconceptions of the patterns that could be present in the data. We focus on the well-defined case of detecting … dark solitons—appearing as local density depletions in a Bose–Einstein condensate (BEC)—using a methodology that …

Quantum dot lasers - history and future prospects

January 29, 2021
Author(s)
Richard Mirin, John E. Bowers, Justin Norman
… quantum dot lasers. We discuss the developments in quantum dot lasers over the past 20 years and the future … Journal of Vacuum Science and Technology A …

Developing Single Layer MOS Quantum Dots for Diagnostic Qubits

December 28, 2020
Author(s)
Yanxue Hong, Aruna Ramanayaka, Ryan Stein, Joshua M. Pomeroy
… platform for intercomparison between materials or for in-line diagnostics, and to provide a testbed for … of challenging and advancing our measurement capabilities. In this report, we present our initial batch of silicon MOS … Journal of Vacuum Science and Technology B …

Characterization of vapor draw vessel performance for low-volatility solid precursor delivery

December 10, 2020
Author(s)
James Maslar, William A. Kimes, Brent A. Sperling, Ravindra K. Kanjolia
… Low volatility precursors are widely utilized in chemical vapor deposition (CVD) and atomic layer … observed for mass per injection. For the conditions used in this investigation, the source efficiency decreased when … Journal of Vacuum Science & Technology A …

EUV-induced carbon growth at contaminant pressures between 10-10 mbar and 10-6 mbar: Experiment and model

December 1, 2020
Author(s)
Shannon B. Hill, Charles Tarrio, Robert F. Berg, Thomas B. Lucatorto
… by ultraviolet (UV) radiation affects precision optics in applications as diverse as semiconductor lithography and … and a model of carbon growth induced by UV exposure in the presence of tetradecane vapor. The model, which … describes the measurements over four orders of magnitude in pressure, and we expect that it can be extrapolated to the …

Calibration of Ray-Tracing with Diffuse Scattering against 28-GHz Directional Urban Channel Measurements

November 18, 2020
Author(s)
Camillo Gentile, Jelena Senic, Chiehping Lai, Derek Caudill, Jack Chuang, Nada Golmie
… ray-tracing engine against channel measurements collected in an urban environment with a 28 GHz directional channel … multi-path components were extracted from the measurements in the delay and 3D angle- of-arrival domains through … models against individual multi-path components mapped in the delay, angle, and space domains. Results, in terms of …

Atomic force microscopy for nanoscale mechanical property characterization

November 10, 2020
Author(s)
Gheorghe Stan, Sean King
… material properties with sub-nanometer resolution. In this review, we focus on AFM as a nanoscale mechanical … that provide such measurements are compared and contrasted in this work on a wide range of materials including ceramics, … metals, semiconductors, polymers, and biomaterials. In the last few years, considerable improvements have been …
Displaying 5451 - 5475 of 13218
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