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Title: Design and construction of a Fourier transform soft x-ray interferometer

Abstract

Helium, with its two electrons and one nucleus, is a three-body system. One of the models for investigating correlated electron motion in this system is autoionization, produced via double excitation of the electrons. Predictions about the autoionization spectrum of helium have differed from each other and from preliminary experimental data. However, previous experiments have not been able to distinguish among the theoretical predictions because their energy resolution is not high enough to resolve the narrow linewidths of quasi-forbidden peaks and the resonances that appear in the highest excited states. Consequently, a team of researchers at Lawrence Berkeley National Laboratory have embarked on a project for building a high-resolution Fourier-Transform Soft X-ray (or VUV) interferometer (FTSX) to provide definitive data to answer remaining questions about the autoionization spectrum of helium. The design and construction of this interferometer is described in detail below, including the use of a flexure stage to provide the large path length difference necessary for high resolution measurements, the manufacture of x-ray beamsplitters, a description of the software, and the solution to the problems of stick-slip, vibration, and alignment. Current progress of its development is also described, as well as future goals.

Authors:
 [1]
  1. San Francisco State Univ., CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
781698
Report Number(s):
LBNL-46680
R&D Project: 458080; TRN: US0111247
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: TH: Thesis (M.S.); Submitted to San Francisco State University, San Francisco, CA (US); PBD: 10 May 2000
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CONSTRUCTION; DESIGN; ENERGY RESOLUTION; EXCITED STATES; INTERFEROMETERS; SOFT X RADIATION; FOURIER TRANSFORMATION; AUTOIONIZATION; HELIUM; AUTOIONIZATION INTERFEROMETER DOUBLE-EXCITATION HELIUM FTSX SOFT X-RAY VUV FLEXURE STAGE SOFTWARE STICK-SLIP VIBRATION ALIGNMENT BEAMSPLITTER

Citation Formats

Spring, John A. Design and construction of a Fourier transform soft x-ray interferometer. United States: N. p., 2000. Web. doi:10.2172/781698.
Spring, John A. Design and construction of a Fourier transform soft x-ray interferometer. United States. doi:10.2172/781698.
Spring, John A. Mon . "Design and construction of a Fourier transform soft x-ray interferometer". United States. doi:10.2172/781698. https://www.osti.gov/servlets/purl/781698.
@article{osti_781698,
title = {Design and construction of a Fourier transform soft x-ray interferometer},
author = {Spring, John A.},
abstractNote = {Helium, with its two electrons and one nucleus, is a three-body system. One of the models for investigating correlated electron motion in this system is autoionization, produced via double excitation of the electrons. Predictions about the autoionization spectrum of helium have differed from each other and from preliminary experimental data. However, previous experiments have not been able to distinguish among the theoretical predictions because their energy resolution is not high enough to resolve the narrow linewidths of quasi-forbidden peaks and the resonances that appear in the highest excited states. Consequently, a team of researchers at Lawrence Berkeley National Laboratory have embarked on a project for building a high-resolution Fourier-Transform Soft X-ray (or VUV) interferometer (FTSX) to provide definitive data to answer remaining questions about the autoionization spectrum of helium. The design and construction of this interferometer is described in detail below, including the use of a flexure stage to provide the large path length difference necessary for high resolution measurements, the manufacture of x-ray beamsplitters, a description of the software, and the solution to the problems of stick-slip, vibration, and alignment. Current progress of its development is also described, as well as future goals.},
doi = {10.2172/781698},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Thesis/Dissertation:
Other availability
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