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NIST Authors in Bold

Displaying 1076 - 1100 of 4633

Colloquium: Ionic phenomena in nanoscale pores through 2D materials

June 27, 2019
Author(s)
Subin Sahu, Michael P. Zwolak
… Ion transport through channels and nanoscale pores cuts … develop filtration and sensing technologies, encompassing ion exclusion membranes, DNA sequencing, single molecule … We will discuss both the physics and applications of ion transport and sensing in 2D membranes. …

Depth Profiling Using C 60 + SIMS Deposition and Topography Development During Bombardment of Silicon

July 30, 2006
Author(s)
John G. Gillen, J Batteas, Chris A. Michaels, P Chi, John A. Small, Eric S. Windsor, Albert J. Fahey, Jennifer R. Verkouteren, W Kim
… A C60+ primary ion source has been coupled to an ion microscope SIMS instrument to examine sputtering of … also observed on silicon substrates after high primary ion dose C60+ bombardment. … cluster bombardment, depth profiling, fullerene, ion source, secondary ion mass spectrometry …

Active light-shift stabilization in modulated CPT clocks

June 5, 2006
Author(s)
V Shah, P Schwindt, Vladislav Gerginov, Svenja A. Knappe, Leo W. Hollberg, John E. Kitching
We demonstrate a simple technique to significantly improve the long-term frequency stability in atomic clocks based on coherent population trapping (CPT). In this technique an additional servo is used to control the local oscillator power level to ensure

Active Light-Shift Stabilization in Modulated CPT Clocks

June 1, 2005
Author(s)
V Shah, P Schwindt, Vladislav Gerginov, Svenja A. Knappe, Leo W. Hollberg, John E. Kitching
We demonstrate a simple technique to significantly improve the long-term frequency stability in atomic clocks vased on coherent population trapping (CPT). In this technique an additional servo is used to control the local oscillator power level to ensure

Alpha-Dot or Not: Comparison of Two Single Atom Optical Clocks

October 5, 2008
Author(s)
Till P. Rosenband, David Hume, Chin-Wen Chou, J.C. Koelemeij, A. Brusch, Sarah Bickman, Windell Oskay, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, Nathan R. Newbury, William C. Swann, Wayne M. Itano, David J. Wineland, James C. Bergquist
Repeated measurements of the frequency ratio of Hg + and Al + single-atom optical clocks over the course of a year yield a constraint on the possible temporal variation of the fine-structure constant a. The time variation of the measured ratio corresponds

Energies and E1, M1, E2, and M2 transition rates for states of the 2s22p4, 2s2p5, and 2p6configurations in oxygen-like ions between F II and Kr XXIX.

September 24, 2013
Author(s)
P. Rynkun, P. Jonsson, G. Gaigalas, Charlotte F. Fischer
… 2s2p5, and 2p6 configurations in all oxygen-like ions between F II and Kr XXIX. Valence, core-valence, and … O-like ions, energies, lifetimes, transition rates, weighted … of the 2s22p4, 2s2p5, and 2p6configurations in oxygen-like ions between F II and Kr XXIX. …

Fragmentation of Leucine Enkephalin as a Function of Laser Fluence in a MALDI TOF-TOF

April 2, 2007
Author(s)
Jennifer M. Campbell, Stephen Stein, Paul S. Blank, Jonathan Epstein, Marvin L. Vestal, Alfred L. Yergey
… The effects of laser fluence on ion formation in MALDI was studied using a tandem TOF mass … followed over laser fluence ranging from the threshold of ion formation to the maximum available, i.e., approximately … data suggest the presence of two distinct environments for ion formation. One is associated with molecular desorption at …

Quantum-enhanced sensing of a mechanical oscillator

July 22, 2019
Author(s)
Katherine C. McCormick, Jonas Keller, Shaun C. Burd, David J. Wineland, Andrew C. Wilson, Dietrich Leibfried
… form |0> +|n> up to n=18 in the motion of a single trapped ion. While experimental imperfections prevent us from … fractional frequency of oscillation of a single trapped ion to approximately 2.6*10^-6} in 5 s. We demonstrate that …

Neutron Collimation With Microchannel Plates: Calibration of Existing Technology and Near

April 1, 2007
Author(s)
A S. Tremsin, Daniel S. Hussey, David L. Jacobson, Muhammad D. Arif, Robert Gregory Downing, W B. Feller, David F. Mildner
… can be manufactured from Gd- or B-doped microchannel plates (MCPs). Structures only a few mm thick have very … Neutron Collimation With Microchannel Plates: Calibration of Existing Technology and Near …

Heavy ion space radiation triggers ongoing DNA base damage by downregulating DNA repair pathways

July 7, 2020
Author(s)
Shubhankar Suman, Pawel Jaruga, M Miral Dizdar, Albert J. Fornace, Jr., Datta Kamal
… particle radiation especially to highly damaging heavy ion radiation, which poses considerable risk to astronauts' … diseases including gastrointestinal diseases after heavy ion radiation exposure during space travel. … Heavy ion space radiation, DNA damage and repair, oxidative stress, …

Experiments and Theory in Cold and Ultracold Collisions

January 1, 1999
Author(s)
J Weiner, V S. Bagnato, S Zilio, Paul S. Julienne
The authors review progress in understanding the nature of atomic collisions occurring at temperatures ranging from the millidegrees Kelvin to the nanodegrees Kelvin regime. The review includes advances in experiments with atom beams, light traps, and

Comparison of Mg-based liquid metal ion sources for scalable focused-ion-implantation doping of GaN

April 18, 2024
Author(s)
Aaron Katzenmeyer, Michael Titze, Sam Frisone, Tony Ohlhausen, Anthony Flores, Deanna Campbell, Bingjun Li, Yongqiang Wang, Jung Han, Edward Bielejec, Rachel Goldman
… suitability of various magnesium-based liquid metal alloy ion sources (LMAIS) for scalable focused-ion-beam (FIB) implantation doping of GaN. We consider GaMg, … Mg depth profile data from Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS). We also provide insight …
Displaying 1076 - 1100 of 4633
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