The Experts below are selected from a list of 753306 Experts worldwide ranked by ideXlab platform

Ernst Bauer - One of the best experts on this subject based on the ideXlab platform.

  • X-RAY MAGNETIC CIRCULAR DICHROISM IMAGING IN A LOW Energy Electron MICROSCOPE
    Surface Review and Letters, 2002
    Co-Authors: Andrea Locatelli, S. Cherifi, Stefan Heun, M. Marsi, Kanta Ono, A. Pavlovska, Ernst Bauer
    Abstract:

    The magnetic domain structure of patterned permalloy films and of a Co(0001) single crystal surface are studied with elliptically polarized light from the new nanospectroscopy beamline at ELETTRA in a low Energy Electron microscope, using it as a diagnostic tool in the commissioning phase of the beamline. Mirror and low Energy Electron microscopy as well as low Energy Electron diffraction are shown to be valuable fast techniques for system alignment and specimen characterization.

  • Polarized Electrons in low Energy Electron microscopy
    AIP Conference Proceedings, 2001
    Co-Authors: Ernst Bauer
    Abstract:

    The application of spin-polarized Electron emission in low Energy Electron microscopy of ferromagnetic materials is reviewed and the possibilities of the spin-dependent reflectivity of slow Electrons for efficient spin detection are described.

  • Compact low-Energy Electron microscope for surface imaging
    Review of Scientific Instruments, 1998
    Co-Authors: P. Adamec, Ernst Bauer, B. Lencová
    Abstract:

    A compact electrostatic low-Energy Electron microscope is described. The Electron optical system of the microscope was optimized in order to reduce the number of correcting elements and thus to simplify construction and operation of the instrument. The lenses are biased so that the specimen can be kept close to ground potential. The electrostatic tetrode objective lens allows to achieve a resolution below 10 nm at 10 eV. For beam separation, a magnetic sector with small deflection angle was used. The separator requires only one coil winding for excitation and does not introduce significant aberrations. A three-lens projector system enables magnifications from 600 to 60 000 times. The microscope was built and tested. The weight of the whole mumetal shielded instrument is less than 20 kg so that it can be attached to almost any specimen chamber via a 6 in. Con-flat flange. The microscope was operated in the mirror, low-Energy Electron microscopy, and low-Energy Electron diffraction modes. In the experimenta...

  • Spectromicroscopy in a low Energy Electron microscope
    Journal of Electron Spectroscopy and Related Phenomena, 1997
    Co-Authors: Ernst Bauer, C. Koziol, G. Lilienkamp, Th. Schmidt
    Abstract:

    Abstract The possibilities and limitations of the combination of spectromicroscopy with low Energy Electron microscopy and the experience obtained with it up to now are discussed.

  • In-situ Applications of Low Energy Electron Microscopy
    In-Situ Microscopy in Materials Research, 1997
    Co-Authors: Ernst Bauer
    Abstract:

    Low Energy Electron Microscopy (LEEM) is a child of surface science and was motivated by the desire to image surfaces with Low Energy Electron Diffraction (LEED) beams in a manner similar to that used in transmission Electron microscopy of crystalline specimens which produce transmission diffraction beams. In surface science it is usual to monitor surface changes with surface-sensitive probes and, therefore, LEEM instruments were designed from the very beginning to allow a large variety of in-situ experiments [1]. This chapter will not describe the basics, possibilities and limitations of LEEM and its extensions which are amply discussed in recent reviews [2–4], It will rather focus on the possibilities of LEEM for in-situ studies as illustrated by work of the author and his collaborators.

M Wing - One of the best experts on this subject based on the ideXlab platform.

  • vheep a very high Energy Electron proton collider
    European Physical Journal C, 2016
    Co-Authors: A Caldwell, M Wing
    Abstract:

    Based on current CERN infrastructure, an Electron–proton collider is proposed at a centre-of-mass Energy of about 9 TeV. A 7 TeV LHC bunch is used as the proton driver to create a plasma wakefield which then accelerates Electrons to 3 TeV, these then colliding with the other 7 TeV LHC proton beam. Although of very high Energy, the collider has a modest projected integrated luminosity of 10–100 pb\(^{-1}\). For such a collider, with a centre-of-mass Energy 30 times greater than HERA, parton momentum fractions, x, down to about \(10^{-8}\) are accessible for photon virtualities, \(Q^2\), of 1 GeV\(^2\). The Energy dependence of hadronic cross sections at high energies, such as the total photon–proton cross section, which has synergy with cosmic-ray physics, can be measured and QCD and the structure of matter better understood in a region where the effects are completely unknown. Searches at high \(Q^2\) for physics beyond the Standard Model will be possible, in particular the significantly increased sensitivity to the production of leptoquarks. These and other physics highlights of a very high Energy Electron–proton collider are outlined.

  • vheep a very high Energy Electron proton collider
    arXiv: High Energy Physics - Experiment, 2016
    Co-Authors: A Caldwell, M Wing
    Abstract:

    Based on current CERN infrastructure, an Electron--proton collider is proposed at a centre-of-mass Energy of about 9 TeV. A 7 TeV LHC bunch is used as the proton driver to create a plasma wakefield which then accelerates Electrons to 3\,TeV, these then colliding with the other 7 TeV LHC proton beam. Although of very high Energy, the collider has a modest projected integrated luminosity of $10-100$ pb$^{-1}$. For such a collider, with a centre-of-mass Energy 30 times greater than HERA, parton momentum fractions, $x$, down to about $10^{-8}$ are accessible for photon virtualities, $Q^2$, of 1 GeV$^2$. The Energy dependence of hadronic cross sections at high energies, such as the the total photon--proton cross section, which has synergy with cosmic-ray physics, can be measured and QCD and the structure of matter better understood in a region where the effects are completely unknown. Searches at high $Q^2$ for physics beyond the Standard Model will be possible, in particular the significantly increased sensitivity to the production of leptoquarks. These and other physics highlights of a very high Energy Electron--proton collider are outlined.

A Caldwell - One of the best experts on this subject based on the ideXlab platform.

  • vheep a very high Energy Electron proton collider
    European Physical Journal C, 2016
    Co-Authors: A Caldwell, M Wing
    Abstract:

    Based on current CERN infrastructure, an Electron–proton collider is proposed at a centre-of-mass Energy of about 9 TeV. A 7 TeV LHC bunch is used as the proton driver to create a plasma wakefield which then accelerates Electrons to 3 TeV, these then colliding with the other 7 TeV LHC proton beam. Although of very high Energy, the collider has a modest projected integrated luminosity of 10–100 pb\(^{-1}\). For such a collider, with a centre-of-mass Energy 30 times greater than HERA, parton momentum fractions, x, down to about \(10^{-8}\) are accessible for photon virtualities, \(Q^2\), of 1 GeV\(^2\). The Energy dependence of hadronic cross sections at high energies, such as the total photon–proton cross section, which has synergy with cosmic-ray physics, can be measured and QCD and the structure of matter better understood in a region where the effects are completely unknown. Searches at high \(Q^2\) for physics beyond the Standard Model will be possible, in particular the significantly increased sensitivity to the production of leptoquarks. These and other physics highlights of a very high Energy Electron–proton collider are outlined.

  • vheep a very high Energy Electron proton collider
    arXiv: High Energy Physics - Experiment, 2016
    Co-Authors: A Caldwell, M Wing
    Abstract:

    Based on current CERN infrastructure, an Electron--proton collider is proposed at a centre-of-mass Energy of about 9 TeV. A 7 TeV LHC bunch is used as the proton driver to create a plasma wakefield which then accelerates Electrons to 3\,TeV, these then colliding with the other 7 TeV LHC proton beam. Although of very high Energy, the collider has a modest projected integrated luminosity of $10-100$ pb$^{-1}$. For such a collider, with a centre-of-mass Energy 30 times greater than HERA, parton momentum fractions, $x$, down to about $10^{-8}$ are accessible for photon virtualities, $Q^2$, of 1 GeV$^2$. The Energy dependence of hadronic cross sections at high energies, such as the the total photon--proton cross section, which has synergy with cosmic-ray physics, can be measured and QCD and the structure of matter better understood in a region where the effects are completely unknown. Searches at high $Q^2$ for physics beyond the Standard Model will be possible, in particular the significantly increased sensitivity to the production of leptoquarks. These and other physics highlights of a very high Energy Electron--proton collider are outlined.

S. Y. Tong - One of the best experts on this subject based on the ideXlab platform.

  • Quantum size effect in low Energy Electron diffraction of thin films
    Applied Surface Science, 2001
    Co-Authors: Michael S. Altman, W.f. Chung, H.c. Poon, Z Q He, S. Y. Tong
    Abstract:

    Abstract Low Energy Electron microscopy (LEEM) is used to study the quantum size effect (QSE) in Electron reflectivity from thin films. Strong QSE interference peaks are seen below 20 eV for Cu and Ag films on the W(1 1 0) surface and Sb films on the Mo(0 0 1) surface. Simple inspection of QSE interference peaks reveals that all three metals grow atomic layer-by-atomic layer. Layer-specific I ( V ) spectra obtained with LEEM permit structural analysis by full dynamical multiple scattering LEED calculations for a layer-by-layer view of thin film structure.

  • LOW-Energy Electron HOLOGRAMS: PROPERTIES AND METHOD OF INVERSION
    Surface Review and Letters, 1997
    Co-Authors: S. Y. Tong, T. P. Chu, H. Huang
    Abstract:

    We examine the differences between low-Energy Electron-diffraction patterns (holograms) and optical holograms. We show that Electron-diffraction patterns in solids are not analogous to optical holograms because of strong dynamical factors. We also show that low-Energy Electron holograms can be inverted by a large-wave-number small-angle integral transformation. The grid sizes in wave number and angular spaces used in the transformation are derived.

Roman A. Zubarev - One of the best experts on this subject based on the ideXlab platform.