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

scholarly journals The Voyage of Metals in the Universe from Cosmological to Planetary Scales: the need for a Very High-Resolution, High Throughput Soft X-ray Spectrometer

2021 ◽  
Author(s):  
F. Nicastro ◽  
J. Kaastra ◽  
C. Argiroffi ◽  
E. Behar ◽  
S. Bianchi ◽  
...  
Keyword(s):  
Chemical Composition ◽  
High Resolution ◽  
Deep Understanding ◽  
High Resolution Spectroscopy ◽  
X Ray ◽  
Viable Solution ◽  
Surrounding Space ◽  
Nuclear Processes ◽  
The Universe ◽  
Very High

AbstractMetals form an essential part of the Universe at all scales. Without metals we would not exist, and the Universe would look completely different. Metals are primarily produced via nuclear processes in stars, and spread out through winds or explosions, which pollute the surrounding space. The wanderings of metals in-and-out of astronomical objects are crucial in determining their own evolution and thus that of the Universe as a whole. Detecting metals and assessing their relative and absolute abundances and energetics can thus be used to trace the evolution of these cosmic components. The scope of this paper is to highlight the most important open astrophysical problems that will be central in the next decades and for which a deep understanding of the Universe’s wandering metals, their physical and kinematical states, and their chemical composition represents the only viable solution. The majority of these studies can only be efficiently performed through High Resolution Spectroscopy in the soft X-ray band.

scholarly journals Sulfur Speciation in Biochars by Very High Resolution Benchtop Kα X-ray Emission Spectroscopy

2018 ◽  
Vol 122 (23) ◽  
pp. 5153-5161 ◽  
Author(s):  
William M. Holden ◽  
Gerald T. Seidler ◽  
Singfoong Cheah
Keyword(s):  
High Resolution ◽  
Emission Spectroscopy ◽  
X Ray ◽  
Sulfur Speciation ◽  
Very High

scholarly journals X-ray studies of the transformation from high- to low-density amorphous water

2019 ◽  
Vol 377 (2146) ◽  
pp. 20180164 ◽  
Author(s):  
Daniel Mariedahl ◽  
Fivos Perakis ◽  
Alexander Späh ◽  
Harshad Pathak ◽  
Kyung Hwan Kim ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Structural Evolution ◽  
High Energy ◽  
Real Space ◽  
High Density ◽  
Low Density ◽  
X Ray ◽  
Amorphous Ice ◽  
Density State ◽  
Amorphous States

Here we report about the structural evolution during the conversion from high-density amorphous ices at ambient pressure to the low-density state. Using high-energy X-ray diffraction, we have monitored the transformation by following in reciprocal space the structure factor S OO ( Q ) and derived in real space the pair distribution function g OO ( r ). Heating equilibrated high-density amorphous ice (eHDA) at a fast rate (4 K min –1 ), the transition to the low-density form occurs very rapidly, while domains of both high- and low-density coexist. On the other hand, the transition in the case of unannealed HDA (uHDA) and very-high-density amorphous ice is more complex and of continuous nature. The direct comparison of eHDA and uHDA indicates that the molecular structure of uHDA contains a larger amount of tetrahedral motives. The different crystallization behaviour of the derived low-density amorphous states is interpreted as emanating from increased tetrahedral coordination present in uHDA. This article is part of the theme issue ‘The physics and chemistry of ice: scaffolding across scales, from the viability of life to the formation of planets'.

A structural study of very high-density amorphous ice

2004 ◽  
Vol 397 (4-6) ◽  
pp. 335-339 ◽  
Author(s):  
Malcolm Guthrie ◽  
Chris A. Tulk ◽  
Chris J. Benmore ◽  
Dennis D. Klug
Keyword(s):  
Structural Study ◽  
High Density ◽  
Amorphous Ice ◽  
Very High

Erratum: Modeling the atomic structure of very high-density amorphous ice [Phys. Rev. B72, 012201 (2005)]

2006 ◽  
Vol 73 (22) ◽  
Author(s):  
J. K. Christie ◽  
M. Guthrie ◽  
C. A. Tulk ◽  
C. J. Benmore ◽  
D. D. Klug ◽  
...  
Keyword(s):  
Atomic Structure ◽  
High Density ◽  
Amorphous Ice ◽  
Very High
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