First Applications of Electron Energy-Loss Spectroscopy with High Energy Resolution

2002 ◽  
Vol 738 ◽  
Author(s):  
Gerald Kothleitner ◽  
Christoph Mitterbauer ◽  
Werner Grogger ◽  
Henny Zandbergen ◽  
Peter Tiemeijer ◽  
...  
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Energy Resolution ◽  
Chemical Bonding ◽  
High Energy ◽  
Structural Features ◽  
High Energy Resolution ◽  
Transmission Electron ◽  
New Instrument ◽  
Electron Energy Loss

ABSTRACTA new transmission electron microscope equipped with a monochromator and a high resolution energy-filter was used for the first time to fully exploit the chemical bonding information contained in the near edge fine structures (ELNES) of electron energy-loss spectra. The instrument is capable of acquiring spectra with an energy resolution in the range of 0.1 eV, thus opening up the way for improved ELNES information. ELNES spectra of TiO2 and CoO have been recorded and are compared with data obtained with a conventional microscope and with x-ray absorption spectroscopy. In case of the L2,3 edges of the transition metals the new instrument revealed previously unobservable fine structure details, but for the O K edges the improved energy resolution does not result in more detailed structural features than observable in common microscopes. Furthermore, the potential of the new microscope to obtain chemical bonding information at the nanometer scale is discussed.

High-energy-resolution monochromator for aberration-corrected scanning transmission electron microscopy/electron energy-loss spectroscopy

2009 ◽  
Vol 367 (1903) ◽  
pp. 3683-3697 ◽  
Author(s):  
Ondrej L. Krivanek ◽  
Jonathan P. Ursin ◽  
Neil J. Bacon ◽  
George J. Corbin ◽  
Niklas Dellby ◽  
...  
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Energy Resolution ◽  
Electron Energy Loss Spectroscopy ◽  
High Energy ◽  
High Energy Resolution ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Electron Energy Loss

An all-magnetic monochromator/spectrometer system for sub-30 meV energy-resolution electron energy-loss spectroscopy in the scanning transmission electron microscope is described. It will link the energy being selected by the monochromator to the energy being analysed by the spectrometer, without resorting to decelerating the electron beam. This will allow it to attain spectral energy stability comparable to systems using monochromators and spectrometers that are raised to near the high voltage of the instrument. It will also be able to correct the chromatic aberration of the probe-forming column. It should be able to provide variable energy resolution down to approximately 10 meV and spatial resolution less than 1 Å.

Toward 10 meV Electron Energy-Loss Spectroscopy Resolution for Plasmonics

2014 ◽  
Vol 20 (3) ◽  
pp. 767-778 ◽  
Author(s):  
Edson P. Bellido ◽  
David Rossouw ◽  
Gianluigi A. Botton
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Surface Plasmon ◽  
Energy Resolution ◽  
Electron Energy Loss Spectroscopy ◽  
High Energy ◽  
High Energy Resolution ◽  
Surface Plasmon Resonances ◽  
Plasmon Resonances ◽  
Electron Energy Loss

AbstractEnergy resolution is one of the most important parameters in electron energy-loss spectroscopy. This is especially true for measurement of surface plasmon resonances, where high-energy resolution is crucial for resolving individual resonance peaks, in particular close to the zero-loss peak. In this work, we improve the energy resolution of electron energy-loss spectra of surface plasmon resonances, acquired with a monochromated beam in a scanning transmission electron microscope, by the use of the Richardson–Lucy deconvolution algorithm. We test the performance of the algorithm in a simulated spectrum and then apply it to experimental energy-loss spectra of a lithographically patterned silver nanorod. By reduction of the point spread function of the spectrum, we are able to identify low-energy surface plasmon peaks in spectra, more localized features, and higher contrast in surface plasmon energy-filtered maps. Thanks to the combination of a monochromated beam and the Richardson–Lucy algorithm, we improve the effective resolution down to 30 meV, and evidence of success up to 10 meV resolution for losses below 1 eV. We also propose, implement, and test two methods to limit the number of iterations in the algorithm. The first method is based on noise measurement and analysis, while in the second we monitor the change of slope in the deconvolved spectrum.

Electron energy-loss near-edge structures of 3d transition metal oxides recorded at high-energy resolution

2003 ◽  
Vol 96 (3-4) ◽  
pp. 469-480 ◽  
Author(s):  
C. Mitterbauer ◽  
G. Kothleitner ◽  
W. Grogger ◽  
H. Zandbergen ◽  
B. Freitag ◽  
...  
Keyword(s):  
Transition Metal ◽  
Energy Loss ◽  
Metal Oxides ◽  
Electron Energy ◽  
Energy Resolution ◽  
Transition Metal Oxides ◽  
High Energy ◽  
High Energy Resolution ◽  
Electron Energy Loss
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