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Title: [Synchrotron studies of x-ray reflectivity from surfaces]. Technical progress report

Abstract

Following a long period of theoretical interest, but only limited measurements, there has recently been an increased number of attempts to expand the relative paucity of experimental information on the structure of liquid surfaces using techniques as diverse as ellipsometry, micro-force balances, non-linear optics, Auger and photoelectron spectroscopy, and x-ray scattering. Our group has played a leading role in the currently expanding application of scattering techniques to the general problem of characterizing the microscopic structure of liquid surfaces and we propose here that this work be extended specifically to liquid metals. In the following sections we will briefly describe the salient features of x-ray scattering that are relevant to the current project, the progress that we have made in the current grant period and the work that we propose to carry out in the forthcoming grant period.

Authors:
Publication Date:
Research Org.:
Harvard Univ., Cambridge, MA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10130300
Report Number(s):
DOE/ER/45379-3
ON: DE92009736
DOE Contract Number:
FG02-88ER45379
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 3 Mar 1992
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; X RADIATION; REFLECTION; SURFACES; ROUGHNESS; REFLECTIVITY; LIQUID METALS; PROGRESS REPORT; OPTICAL PROPERTIES; SYNCHROTRON RADIATION; SCATTERING; WETTABILITY; THERMODYNAMIC PROPERTIES; MERCURY; 360102; 360104; 663620; STRUCTURE AND PHASE STUDIES; PHYSICAL PROPERTIES; PHYSICS OF RADIATIONS OTHER THAN NEUTRONS

Citation Formats

Pershan, P.S.. [Synchrotron studies of x-ray reflectivity from surfaces]. Technical progress report. United States: N. p., 1992. Web. doi:10.2172/10130300.
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Pershan, P.S.. [Synchrotron studies of x-ray reflectivity from surfaces]. Technical progress report. United States. doi:10.2172/10130300.
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Pershan, P.S.. Tue . "[Synchrotron studies of x-ray reflectivity from surfaces]. Technical progress report". United States. doi:10.2172/10130300. https://www.osti.gov/servlets/purl/10130300.
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@article{osti_10130300,
title = {[Synchrotron studies of x-ray reflectivity from surfaces]. Technical progress report},
author = {Pershan, P.S.},
abstractNote = {Following a long period of theoretical interest, but only limited measurements, there has recently been an increased number of attempts to expand the relative paucity of experimental information on the structure of liquid surfaces using techniques as diverse as ellipsometry, micro-force balances, non-linear optics, Auger and photoelectron spectroscopy, and x-ray scattering. Our group has played a leading role in the currently expanding application of scattering techniques to the general problem of characterizing the microscopic structure of liquid surfaces and we propose here that this work be extended specifically to liquid metals. In the following sections we will briefly describe the salient features of x-ray scattering that are relevant to the current project, the progress that we have made in the current grant period and the work that we propose to carry out in the forthcoming grant period.},
doi = {10.2172/10130300},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 03 00:00:00 EST 1992},
month = {Tue Mar 03 00:00:00 EST 1992}
}
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Technical Report:
View Technical Report (3.32 MB)
DOI:  10.2172/10130300
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  • Following a long period of theoretical interest, but only limited measurements, there has recently been an increased number of attempts to expand the relative paucity of experimental information on the structure of liquid surfaces using techniques as diverse as ellipsometry, micro-force balances, non-linear optics, Auger and photoelectron spectroscopy, and x-ray scattering. Our group has played a leading role in the currently expanding application of scattering techniques to the general problem of characterizing the microscopic structure of liquid surfaces and we propose here that this work be extended specifically to liquid metals. In the following sections we will briefly describe themore » salient features of x-ray scattering that are relevant to the current project, the progress that we have made in the current grant period and the work that we propose to carry out in the forthcoming grant period.« less

  • Short communication.

  • This report briefly discusses progress made last quarter. Wetting properties of mercury and gallium are discussed. 3 refs.

  • ; ;
    In this work, recent studies of surface magnetism, as observed by x-ray scattering techniques, are described. The experiments were concerned with uranium dioxide crystals for which x-ray resonance effects enhance the small magnetic signal from the surface. The main result is that, in contrast to the bulk which exhibits a discontinuous magnetic ordering transition, both the (001) and (111) surface layers order continuously. This is reminiscent of the general phenomenon of surface wetting, but had not been previously observed for magnetic materials. Magnetic reflectivity studies show further that the near-surface magnetic layers are more disordered than layers deep in themore » bulk, even at low temperatures.« less

  • ; ; ; ...
    The authors present a simple closed-form expression for the reflectivity from a multilayer which includes the effects of absorption, refraction, surface and substrate reflections but neglects dynamical effects. This expression reproduces the exact dynamical calculation except for the regions near the critical angle and for intense Bragg reflections. The expression is generalized to include cumulative interface roughness which follows a t{sup 1/2} power-law growth.