High-pressure NMR kinetics. Part 41. Dissociative substitution in four-coordinate planar platinum(II) complexes as evidenced by variable-pressure high-resolution proton NMR magnetization transfer experiments

1989 ◽  
Vol 111 (21) ◽  
pp. 8161-8165 ◽  
Author(s):  
Urban Frey ◽  
Lothar Helm ◽  
Andre E. Merbach ◽  
Raffaello Romeo
Keyword(s):  
High Pressure ◽  
High Resolution ◽  
Magnetization Transfer ◽  
Proton Nmr ◽  
Variable Pressure

Nano-probe x-ray analysis and high-resolution imaging on planar defects in high-pressure synthesized infinite-layer superconductor

1994 ◽  
Vol 52 ◽  
pp. 728-729
Author(s):  
Y. Y. Wang ◽  
H. Zhang ◽  
V. P. Dravid ◽  
H. Zhang ◽  
L. D. Marks ◽  
...  
Keyword(s):  
High Pressure ◽  
High Resolution ◽  
Atomic Structure ◽  
Emission Spectra ◽  
High Resolution Electron Microscopy ◽  
Planar Defects ◽  
X Ray ◽  
Infinite Layer ◽  
Resolution Electron ◽  
Resolution Imaging

Azuma et al. observed planar defects in a high pressure synthesized infinitelayer compound (i.e. ACuO2 (A=cation)), which exhibits superconductivity at ~110 K. It was proposed that the defects are cation deficient and that the superconductivity in this material is related to the planar defects. In this report, we present quantitative analysis of the planar defects utilizing nanometer probe xray microanalysis, high resolution electron microscopy, and image simulation to determine the chemical composition and atomic structure of the planar defects. We propose an atomic structure model for the planar defects.Infinite-layer samples with the nominal chemical formula, (Sr1-xCax)yCuO2 (x=0.3; y=0.9,1.0,1.1), were prepared using solid state synthesized low pressure forms of (Sr1-xCax)CuO2 with additions of CuO or (Sr1-xCax)2CuO3, followed by a high pressure treatment.Quantitative x-ray microanalysis, with a 1 nm probe, was performed using a cold field emission gun TEM (Hitachi HF-2000) equipped with an Oxford Pentafet thin-window x-ray detector. The probe was positioned on the planar defects, which has a 0.74 nm width, and x-ray emission spectra from the defects were compared with those obtained from vicinity regions.

scholarly journals High Resolution Proton NMR Studies of Gangliosides

1989 ◽  
Vol 264 (6) ◽  
pp. 3478-3483 ◽  
Author(s):  
S Ando ◽  
R K Yu ◽  
J N Scarsdale ◽  
S Kusunoki ◽  
J H Prestegard
Keyword(s):  
High Resolution ◽  
Proton Nmr ◽  
Nmr Studies

High-resolution peptide separations using nano-LC at ultra-high pressure

2013 ◽  
Vol 36 (7) ◽  
pp. 1192-1199 ◽  
Author(s):  
Lucie Nováková ◽  
Axel Vaast ◽  
Catherine Stassen ◽  
Ken Broeckhoven ◽  
Mauro De Pra ◽  
...  
Keyword(s):  
High Pressure ◽  
High Resolution ◽  
Ultra High Pressure ◽  
Peptide Separations

scholarly journals High resolution proton NMR of dilute spins in solids

1982 ◽  
Vol 76 (5) ◽  
pp. 2767-2768 ◽  
Author(s):  
Richard Eckman
Keyword(s):  
High Resolution ◽  
Proton Nmr
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