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Displaying 2001 - 2025 of 3842

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 …

Decoupled Molecular and Inorganic Framework Dynamics in CH 3 NH 3 PbCl 3

December 30, 2019
Author(s)
M. Songvilay, Zitian Wang, Victoria Garcia Sakai, T. Guidi, M. Bari, Zuo-Guang Ye, Guangyong Xu, K. L. Brown, Peter M. Gehring, Christopher Stock
… The organic cation and inorganic framework are bound by hydrogen bonds that tether the molecules to the halide … perovskites is set by the lead-halide bond, not by the hydrogen bond. …

Silicon epitaxy on H-terminated Si (100) surfaces at 250deg C

March 31, 2016
Author(s)
Xiao Deng, Pradeep N. Namboodiri, Kai Li, Xiqiao Wang, Gheorghe Stan, Alline F. Myers, Xinbin Cheng, Tongbao Li, Richard M. Silver
… systematically compared with the growth characteristics on hydrogen terminated silicon (H: Si) surfaces as routinely encountered in atomic scale hydrogen lithography. STM images indicate that growth …

N-Nitrosation of Amines by NO 2 and NO: A Theoretical Study

March 22, 2007
Author(s)
Yi-Lei Zhao, Stephen L. Garrison, Carlos A. Gonzalez, William D. Thweatt, M Marquez
… suggest a free radical mechanism, in which NO2 abstracts a hydrogen atom from nitrogen in primary and secondary amines … of the high activity of the 5-m-r alkylamine stems from a hydrogen-bond-like interaction between the aminyl radical and …

Interstellar Antifreeze: Ethylene glycol

April 1, 2004
Author(s)
J M. Hollis, Francis J. Lovas, P R. Jewell, L H. Coudert
… molecules are formed in the interstellar clouds, atomic hydrogen (H) and carbon monoxide (CO) could form formaldehyde … have shown that the gas-phase reaction of atomic hydrogen (H) and solid-phase CO at 10-20 K can produce …

Photopolymerization Kinetics of Methacrylate Dental Resins

August 1, 2003
Author(s)
Sabine H. Dickens, J W. Stansbury, Kwang-Woo Choi, C J. Floyd
… near equivalent mole ratios for highest reactivity. The hydrogen bonding interactions, which substantially influence … final conversion were found for the two base resins having hydrogen bonding interactions. The structures of the …

Heteronuclear NMR and Crystallographic Studies of Wild-Type and H187Q Escherichia Coli Uracil DNA Glycosylase: Electrophilic Catalysis of Uracil Expulsion by a Neutral Histidine 187

September 14, 1999
Author(s)
A C. Drohat, G Xiao, M Tordova, J. Jagadeesh, K Pankiewicz, K A. Watanbe, G L. Gilliland, J T. Stivers
The nature of the putative general acid, His187, in the reaction catalyzed by Escherichia coli uracil DNA glycosylase (UDG) was investigated using X-ray crystallography and NMR spectroscopy. The crystal structures of H187Q UDG, and its complex with uracil

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 2001 - 2025 of 3842
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