A multichannel electron energy loss spectrometer for low-temperature condensed films
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215 (United States)
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.
- OSTI ID:
- 20658069
- Journal Information:
- Journal of Chemical Physics, Vol. 121, Issue 21; Other Information: DOI: 10.1063/1.1807371; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
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CYLINDRICAL CONFIGURATION
ELECTRON SPECTROMETERS
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ENERGY-LOSS SPECTROSCOPY
EQUATIONS OF MOTION
NUMERICAL ANALYSIS
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