Vibrational dynamics of amorphous ice structures studied by high-resolution neutron spectroscopy

2008 ◽  
Vol 78 (6) ◽  
Author(s):  
Michael Marek Koza
Keyword(s):  
High Resolution ◽  
Neutron Spectroscopy ◽  
Vibrational Dynamics ◽  
Amorphous Ice

Vibrational dynamics of very high density amorphous ice studied by high-resolution x-ray spectroscopy

2008 ◽  
Vol 78 (22) ◽  
Author(s):  
Michael Marek Koza ◽  
Burkhard Geil ◽  
Marco Scheuermann ◽  
Helmut Schober ◽  
Giulio Monaco ◽  
...  
Keyword(s):  
High Resolution ◽  
High Density ◽  
Vibrational Dynamics ◽  
X Ray ◽  
Amorphous Ice ◽  
Very High

A metal- coating Chamber for High-Resolution Cryo-SEM

1990 ◽  
Vol 48 (1) ◽  
pp. 418-419
Author(s):  
John G. Sheehan
Keyword(s):  
High Resolution ◽  
Colloidal Suspensions ◽  
Metal Coating ◽  
Colloidal Interactions ◽  
Amorphous Ice ◽  
High Vapor ◽  
Particulate Coatings ◽  
20 Nm ◽  
Film Nucleation ◽  
Coating Chamber

Improvements in particulate coatings for printable paper require understanding mechanisms of colloidal interactions in paper coating suspensions. One way to deduce colloidal interactions is to mage particle spacings and orientations at high resolution with cryo-SEM. Recent improvements in cryo-SEM technique have increased resolution enough to image particles in coating paints,vhich are sometimes smaller than 100 nm. In this report, a metal-coating chamber is described for preparation of colloidal suspensions for cryo-SEM at resolution down to 20 nm. It was found that etching is not necessary to achieve this resolution.A 120 K cryo-SEM sample will remain in an SEM for hours without noticeable condensation of imorphous ice. This is due to the high vapor pressure of vapor-condensed amorphous ice, measured by Kouchi. However, clean vacuum is required to coat samples with the thinnest possible continuous metal films which are required for high magnification SEM. Vapor contaminants, especially hrydrocarbons, are known to interfere with thin-film nucleation and growth so that more metal is needed to form continuous films, and resolution is decreased. That is why the metal-coating chamber in fig. 1 is designed for the cleanest possible vacuum. Feedthroughs for the manipulator md the shutter, which are operated during metal coating, are sealed with leak-proof stainless-steel Dellows. The transfer rod slides through a baseplate feedthrough that is double o-ring sealed.

High-Resolution Neutron Spectroscopy for the Investigation of Hydrogen Diffusion and Molecular Rotations in Solids

1993 ◽  
Vol 48 (1-2) ◽  
pp. 406-414
Author(s):  
T. Springer
Keyword(s):  
High Resolution ◽  
Hydrogen Diffusion ◽  
Quantum Effects ◽  
Quantum States ◽  
The Other ◽  
Neutron Spectroscopy ◽  
Impurity Atoms ◽  
Molecular Rotations ◽  
Rotational Motions ◽  
Diffusion Of Hydrogen

Abstract An introductory survey on applications of high-resolution neutron spectroscopy is presented, dealing with the motion of hydrogen in solids, namely concerning (i) random rotational motions or stationary tunneling states of NH+4-ions or CH3-groups, and (ii) diffusion of hydrogen in alloys. For the rotation of hydrogenous groups in solids, at higher temperatures rotational jumps can be found, whereas quantum states are observed by μeV-spectroscopy at temperatures below 50 K. On the other hand, hydrogen diffusion does not reveal pronounced evidence of quantum effects, except for hydrogen in a metal containing impurity atoms.

Study of the tunneling rotations in phase II of solid CH4 with high resolution neutron spectroscopy

1981 ◽  
Vol 75 (8) ◽  
pp. 4003-4009 ◽  
Author(s):  
A. Heidemann ◽  
W. Press ◽  
K. J. Lushington ◽  
J. A. Morrison
Keyword(s):  
High Resolution ◽  
Phase Ii ◽  
Neutron Spectroscopy

scholarly journals Hyperfine interaction in cobalt by high-resolution neutron spectroscopy

2018 ◽  
Vol 31 (2) ◽  
pp. 025801 ◽  
Author(s):  
Tapan Chatterji ◽  
Michaela Zamponi ◽  
Joachim Wuttke
Keyword(s):  
High Resolution ◽  
Hyperfine Interaction ◽  
Neutron Spectroscopy

High resolution neutron spectroscopy for helium isotopes

1992 ◽  
Vol 313 (1-2) ◽  
pp. 261-265
Author(s):  
M.S. Abdel-Wahab ◽  
H.O. Klages ◽  
G. Schmalz ◽  
B.H. Haesner ◽  
J. Kecskemeti ◽  
...  
Keyword(s):  
High Resolution ◽  
Helium Isotopes ◽  
Neutron Spectroscopy

Development of an high resolution neutron spectroscopy system using a diamond detector and a remote digital acquisition methodology

2014 ◽  
Vol 89 (9-10) ◽  
pp. 2184-2188 ◽  
Author(s):  
Mario Pillon ◽  
Fabrizio Andreoli ◽  
Maurizio Angelone ◽  
Alberto Milocco ◽  
Roberto Cardarelli
Keyword(s):  
High Resolution ◽  
Neutron Spectroscopy ◽  
Diamond Detector ◽  
Spectroscopy System

High-resolution neutron spectroscopy of crystal-field excitations in uranium dioxide

1988 ◽  
Vol 21 (26) ◽  
pp. L931-L937 ◽  
Author(s):  
R Osborn ◽  
A D Taylor ◽  
Z A Bowden ◽  
M A Hackett ◽  
W Hayes ◽  
...  
Keyword(s):  
High Resolution ◽  
Crystal Field ◽  
Uranium Dioxide ◽  
Neutron Spectroscopy
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