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Displaying 1901 - 1925 of 3758

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

Rate Constants for Unimolecular Decomposition of SF 6 -

November 21, 2001
Author(s)
Yicheng Wang, R. Champion, I. V. Dyakov, B. Peko
Insulating gas mixtures containing SF 6 have been promoted to serve as replacements for pure SF 6 in order to reduce SF 6 atmospheric emission. It has been argued that some synergism may be achieved by choosing proper buffer gases in mixtures with SF 6

MALDI MS of Saturated Hydrocarbon Polymers: Polyethylene and Other Polyolefins

May 1, 2001
Author(s)
William E. Wallace, Charles M. Guttman, B M. Fanconi, Barry J. Bauer
Saturated hydrocarbon polymers, polyethylene and polypropylene, are, by production volume, the most widely used of all synthetic polymers. Their molecular mass and molecular mass distribution (MMD) are critical in determining performance properties. There

Charge-transfer rate constants for N+/2 (v=0-4) with Ar at thermal energies

July 1, 1996
Author(s)
S Kato, J A. de Gouw, C D. Lin, V M. Bierbaum, S R. Leone
Rate constants for the charge-transfer reaction N 2 +(V)+ Ar>N 2+Ar + are measured at thermal energies as a function of initial vibrational excitation by laser-induced fluorescence. The reaction is slow for v=0, whereas the rate constants for v=1-4 are

Photoluminescence from an Nd3+ doped AlGaAs semiconductor structure

May 16, 2004
Author(s)
Kirk Ullmann, Mark Su, Kevin L. Silverman, Joseph J. Berry, Todd E. Harvey, Richard Mirin
We report room temperature photoluminescence from a Nd3+ doped AlGaAs semiconductor. Oxidation of the AlGaAs greatly improves the luminescence efficiency of the Nd3+ ions.

Electron Energy Loss Spectroscopy of CeO 2 -x Nanoparticles

January 7, 2003
Author(s)
W Lijun, H J. Wiesmann, A R. Moodenbaugh, Daniel A. Fischer, Y Zhu, M Suenaga
ria has been widely studied due to its applications, such as a catalyst in vehicle emissions system and an electrolyte material in solid oxide fuel cells. Recently, it has been reported that CeO2-x nanoparticles exhibit lattice expansion and valence

Site-Specific Valence-Band Photoemission Study of A-Fe 2 O 3

August 1, 2002
Author(s)
C Y. Kim, Michael Bedzyk, E J. Nelson, Joseph Woicik, L E. Berman
We have measured the site-specific valence-electronic structure of α-Fe 2O 3 by using a spatially modulated X-ray standing wave as the excitation source for photoemission. Contributions to the valence band density of states from oxygen and iron ions are

Sub-dekahertz spectroscopy of 199 Hg +

September 21, 2001
Author(s)
J. C. Bergquist, R J. Rafac, B. A. Young, James A. Beall, Wayne M. Itano, David J. Wineland
… transition of a single laser-cooled 199 Hg + ion stored in a cryogenic radio-frequency ion trap. We observe Fourier-transoform limited linewidths as …

Interconversion of Peptide Mass Spectral Libraries Derivatized with iTRAQ or TMT Labels

July 7, 2016
Author(s)
Zheng Zhang, Xiaoyu Yang, Yuri A. Mirokhin, Dmitrii V. Tchekhovskoi, Weihua Ji, Sanford P. Markey, Pedatsur Neta, Bowen A. Michael, Stephen E. Stein
Derivatizing peptides with isobaric tags such as iTRAQ and TMT is widely employed in proteomics due to their ability to multiplex quantitative measurements. We recently made publicly available a large peptide library derived from iTRAQ 4-plex labeled

Gold Nanoparticle Quantitation by Whole Cell Tomography

November 13, 2015
Author(s)
Aric W. Sanders, Kavita M. Jeerage, Cindi Schwartz, Alexandra Curtin, Ann C. Chiaramonti Debay
… mammalian stem cells was characterized using fast focused ion beam-scanning electron microscopy based tomography. … Cells were then serially sectioned using a gallium ion beam and imaged using a scanning electron beam. To … using transmission electron microscopy and scanning helium ion microscopy. Complete tomographic series were then used to …

Gate Dielectric Thickness Metrology Using Transmission Electron Microscopy

January 1, 2000
Author(s)
J H. Scott, Eric S. Windsor, D Brady, J Canterbury, A. Karamcheti, W Chism, A C. Diebold
… x-ray photoelectron spectroscopy, and medium energy ion scattering. Silicon oxynitride films were grown by … Cross sectional TEM samples were prepared by dimpling/ion milling and HRTEM micrographs were acquired at 297 keV … the cross section glue line and both sides of the dimple/ion mill perforation. Statistical analysis of the HRTEM …
Displaying 1901 - 1925 of 3758
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