6 research outputs found
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Local environment around the oxygen atoms in Y-Ba-Cu-O studied x-ray absorption fine structure (XAFS) spectroscopy
The local environment about oxygen atoms in the CuO{sub 2} plane in YBa{sub 2}Cu{sub 3}O{sub 7} single crystals has been investigated by orientation-dependent x-ray absorption fine structure (XAFS) spectroscopy at the O ls edge using bulk-sensitive fluorescence-yield-detection method. Within experimental accuracy ({plus minus}0.03 {Angstrom}) no structural change in local ordering about oxygen atoms in the CuO{sub 2} plane at 90 K has been detected. 14 refs
Realisierungsstudie zur Spallationsneutronenquelle (SNQ). Teil I: Wissenschaftliche Motivation und Beschreibung der Anlage
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Local environment around the oxygen atoms in Y-Ba-Cu-O studied x-ray absorption fine structure (XAFS) spectroscopy
The local environment about oxygen atoms in the CuO{sub 2} plane in YBa{sub 2}Cu{sub 3}O{sub 7} single crystals has been investigated by orientation-dependent x-ray absorption fine structure (XAFS) spectroscopy at the O ls edge using bulk-sensitive fluorescence-yield-detection method. Within experimental accuracy ({plus_minus}0.03 {Angstrom}) no structural change in local ordering about oxygen atoms in the CuO{sub 2} plane at 90 K has been detected. 14 refs
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Studies of Y-Ba-Cu-O single crystals by x-ray absorption spectroscopy
The symmetry and density of unoccupied states of YBa{sub 2}Cu{sub 3}O{sub 7} YBa{sub 2}Cu{sub 4}O{sub 8} have been investigated by orientation dependent x-ray absorption spectroscopy on the O 1s edge using a bulk-sensitive fluorescence-yield-detection method. It has been found that the O 2p holes are distributed equally between the CuO{sub 2} planes and CuO chains and that the partial density of unoccupied O 2p states in the CuO{sub 2} planes are identical in both systems investigated. The upper Hubbard band has been observed in the planes but not in the chains in both systems. 18 refs
Possible Atmospheric Diversity of Low Mass Exoplanets – Some Central Aspects
Exoplanetary science continues to excite and surprise with its rich diversity. We discuss here some key aspects potentially influencing the range of exoplanetary terrestrial-type atmospheres which could exist in nature. We are motivated by newly emerging observations, refined approaches to address data degeneracies, improved theories for key processes affecting atmospheric evolution and a new generation of atmospheric models which couple physical processes from the deep interior through to the exosphere and consider the planetary-star system as a whole. Using the Solar System as our guide we first summarize the main processes which sculpt atmospheric evolution then discuss their potential interactions in the context of exoplanetary environments. We summarize key uncertainties and consider a diverse range of atmospheric compositions discussing their potential occurrence in an exoplanetary context