Showing papers by "Ondrej L. Krivanek published in 1987"
TL;DR: In this article, the design and performance of a parallel detection electron energy loss spectrometer utilizing several new design elements are described, including three electromagnetic quadrupole lenses to transform the electron energy spectrum produced by single magnetic sector spectrometers into a magnified spectrum suitable for parallel detection, and detects the spectrum with a single-crystal YAG scintillator, which is fiber-optically coupled to either a 512-channel or a 1024-channel photodiode detector.
194 citations
Patent•
28 Aug 1987
TL;DR: In this article, quadrupole and sextupole lenses are interposed between an energy-dispersing device and an electron imaging device in an energy selected electron imaging filter.
Abstract: Quadruple lenses 30, 31 and 32 and sextupole lenses 40, 41, 42, and 43 are interposed between a energy-dispersing device 17 and an electron imaging device 50 in an energy-selected electron imaging filter. The energy-dispersing device produces a focussed spectrum 21 of electron energies in the plane of an energy-selecting slit 20, and the quadrupole and sextupole lenses transform the spectrum into an energy-selecting slit may also be either removed or opened wide, and the quadrupole lenses may be refocussed, so that the electron imaging device directly observes a magnified spectrum of the electron energies.
24 citations
Patent•
10 Aug 1987
TL;DR: In this paper, quadrupole electron lenses are disposed between an energy-dispersing device 15 and a parallel detector 50 in an electron energy-loss spectrometer to obtain the desired energy dispersion of the spectrum.
Abstract: Quadrupole electron lenses 21, 22, 23 and 24 are disposed between an energy-dispersing device 15 and a parallel detector 50 in an electron energy-loss spectrometer. The power and polarity of the quadrupole lenses may be adjusted to simultaneously provide the desired energy dispersion of the spectrum, and a precise match between the width of the spectrum and the width of the parallel detector. Additional quadrupole lenses may be interposed between quadrupole lens 24 and the detector 50 to further increase the energy dispersion.
24 citations