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Title: A multichannel electron energy loss spectrometer for low-temperature condensed films

Abstract

We describe a wide-gap multichannel cylindrical deflection electron energy analyzer suitable for measuring the weak signals characteristic of electronically inelastic electron energy loss spectra. The analyzer has nearly ideal fringing field termination, and its resolution and energy dispersion were characterized as a function of energy by solving numerically the equation of motion of electrons in an ideal cylindrical electric field. The numerical results for the radial location of the electrons at the detector as a function of the entrance location, angle, and energy are closely approximated by a second order polynomial, and match closely with those observed. The detection efficiency of the analyzer is 100-150 times better than that of an equivalent single-channel instrument, but limited energy transmission of the zoom lens system used in our case reduced it by a factor of about 2. The performance of the new instrument was demonstrated by measuring the {sup 3}E{sub 1u} electronic spectrum of benzene in only 2 min and the spectrum of endo-benzotricyclo[4.2.1.0{sup 2.5}]nonane.

Authors:
; ; ;  [1]
  1. Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215 (United States)
Publication Date:
OSTI Identifier:
20658069
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 21; Other Information: DOI: 10.1063/1.1807371; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CYLINDRICAL CONFIGURATION; ELECTRON SPECTROMETERS; ELECTRONS; ENERGY DEPENDENCE; ENERGY-LOSS SPECTROSCOPY; EQUATIONS OF MOTION; NUMERICAL ANALYSIS; POLYNOMIALS; THIN FILMS

Citation Formats

David, Donald E, Popovic, Duska B, Antic, Dean, and Michl, Josef. A multichannel electron energy loss spectrometer for low-temperature condensed films. United States: N. p., 2004. Web. doi:10.1063/1.1807371.
David, Donald E, Popovic, Duska B, Antic, Dean, & Michl, Josef. A multichannel electron energy loss spectrometer for low-temperature condensed films. United States. https://doi.org/10.1063/1.1807371
David, Donald E, Popovic, Duska B, Antic, Dean, and Michl, Josef. 2004. "A multichannel electron energy loss spectrometer for low-temperature condensed films". United States. https://doi.org/10.1063/1.1807371.
@article{osti_20658069,
title = {A multichannel electron energy loss spectrometer for low-temperature condensed films},
author = {David, Donald E and Popovic, Duska B and Antic, Dean and Michl, Josef},
abstractNote = {We describe a wide-gap multichannel cylindrical deflection electron energy analyzer suitable for measuring the weak signals characteristic of electronically inelastic electron energy loss spectra. The analyzer has nearly ideal fringing field termination, and its resolution and energy dispersion were characterized as a function of energy by solving numerically the equation of motion of electrons in an ideal cylindrical electric field. The numerical results for the radial location of the electrons at the detector as a function of the entrance location, angle, and energy are closely approximated by a second order polynomial, and match closely with those observed. The detection efficiency of the analyzer is 100-150 times better than that of an equivalent single-channel instrument, but limited energy transmission of the zoom lens system used in our case reduced it by a factor of about 2. The performance of the new instrument was demonstrated by measuring the {sup 3}E{sub 1u} electronic spectrum of benzene in only 2 min and the spectrum of endo-benzotricyclo[4.2.1.0{sup 2.5}]nonane.},
doi = {10.1063/1.1807371},
url = {https://www.osti.gov/biblio/20658069}, journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 21,
volume = 121,
place = {United States},
year = {Wed Dec 01 00:00:00 EST 2004},
month = {Wed Dec 01 00:00:00 EST 2004}
}