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ID 45869
file
title alternative
Atomic dynamics in fluids studied by inelastic x-ray scattering
creator
Kajihara, Yukio
Matsuda, Kazuhiro
Ishikawa, Daisuke
Tsutsui, Satoshi
Baron, Alfred Q.
NDC
Physics
abstract
1990年代半ばにmeVオーダーのエネルギー分解能を達成したX線非弾性散乱実験技術により,高温高圧下の極端条件下にある超臨界流体の原子,分子ダイナミクス研究は大きく進展した。本稿では,著者らが独自の高温高圧実験技術を用いてSPring-8のBL35XUビームラインで行った,高温高圧下で膨張した流体水銀のX線非弾性散乱実験を中心に,液体,流体の原子ダイナミクスの理論的背景と,超臨界流体特有のダイナミクスについて紹介する。中でも,流体水銀の金属-非金属転移近傍で観察された,音響モードのエネルギーが超音波を用いて観測された音速よりも3倍大きい分散を示す速い音波の解明は,原子が凝集して金属が形成される素過程を理解する上で重要な現象と考えられる。本稿の結びでは,この分野の近い将来についても展望する。
abstract
Studies on atomic dynamics in supercritical fluids at high temperature and high pressure have remarkably been advanced by using an inelastic x-ray scattering technique that achieved a meV-energy resolution in the middle of 1990's. In this article, we describe a brief review of the theoretical background on liquid dynamics, our own high-temperature high-pressure technique and recent results of atomic dynamics in supercritical fluids. In particular, we report the results of inelastic x-ray scattering measurements for expanding fluid Hg at high temperature and high pressure, which were conducted at BL35XU/SPring-8. We found that in the metal-nonmetal transition in Fluid Hg, the excitation energy of the acoustic mode disperses three times faster than the adiabatic sound velocity obtained by ultrasonic measurements. This phenomenon must be crucial to understand how a metallic state is formed during atomic condensation accurately. Finally we put a future development of this field in perspective.
journal title
放射光
volume
Volume 23
issue
Issue 4
start page
219
end page
229
date of issued
2010-07-31
publisher
日本放射光学会
issn
0914-9287
ncid
naid
language
jpn
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2010 The Japanese Society for Synchrotron Radiation Research
department
Graduate School of Integrated Arts and Sciences



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