Inverse Photoemission

14,000,000 Leading Edge Experts on the ideXlab platform

Scan Science and Technology

Contact Leading Edge Experts & Companies

Scan Science and Technology

Contact Leading Edge Experts & Companies

The Experts below are selected from a list of 189 Experts worldwide ranked by ideXlab platform

Franco Ciccacci - One of the best experts on this subject based on the ideXlab platform.

  • spin resolved Inverse Photoemission from pt fe 001
    Physical Review B, 1998
    Co-Authors: Riccardo Bertacco, Franco Ciccacci
    Abstract:

    The magnetic properties of unoccupied electronic states of Pt films grown on Fe(001) have been investigated by means of spin-resolved Inverse Photoemission. Interface and overlayer derived states are clearly identified, while their polarization dependence indicates a ferromagnetic coupling between Pt and Fe. The magnetic moment induced in the film remains, however, confined at the interface and polarization effects disappear above \ensuremath{\sim}5 Pt atomic layers. The persistence of interface derived states in thicker films points towards the formation of a nonabrupt interface.

  • High-sensitivity bandpass UV photon detector for Inverse Photoemission
    Measurement Science and Technology, 1993
    Co-Authors: Marco Finazzi, A Bastianon, G Chiaia, Franco Ciccacci
    Abstract:

    The authors describe a new type of high-efficiency UV photon detector which is simple and reliable, obtained by combining the high- and low-pass filtering of a KBr coated photocathode and a CaF2 window. This device is suitable for isochromatic Inverse Photoemission spectroscopy.

  • Ultraviolet Inverse Photoemission from FeS2
    Solid State Communications, 1992
    Co-Authors: E. Puppin, Marco Finazzi, Franco Ciccacci
    Abstract:

    Abstract We present a set of angle integrated Inverse Photoemission spectra from FeS 2 taken in the ultraviolet region (12−25eV) in the isochromat mode; this is the first application of photon energy dependent isochromat Inverse Photoemission to a transition metal sulfide. It will be shown that the spectra can be simply interpreted in terms of the available single-particle ground state calculations. The data will also be discussed in the light of present theories on correlated systems.

  • Ultraviolet Inverse Photoemission spectroscopy from YFe2
    Solid State Communications, 1991
    Co-Authors: Lucio Braicovich, E. Puppin, Franco Ciccacci, M. Sancrotti, E. Vescovo, Giuseppe Bertuccio
    Abstract:

    Abstract We present Inverse Photoemission results in the ultraviolet (11.3–23eV) from YFe2. The photon energy dependence of k-integrated isochromat spectra gives direct access to the Fe and Y contributions to the density of empty electron states. The measurements are compared with published calculations; it is shown that the position of the mixed Fe(3d)−Y(4d) peak around 2 eV above the Fermi level is particularly critical.

Masaki Taniguchi - One of the best experts on this subject based on the ideXlab platform.

  • Inverse Photoemission Spectroscopy
    Hyomen Kagaku, 2008
    Co-Authors: Hitoshi Sato, Hirofumi Namatame, Masashi Nakatake, Osamu Morimoto, Masaki Taniguchi
    Abstract:

    Inverse Photoemission spectroscopy (IPES) is the powerful technique to directly investigate the unoccupied electronic states of materials. In this technique, electrons are injected to samples, and then emitted photons from the samples are detected. In this article, we describe the outline of IPES including its principle, and apparatuses we have developed and constructed. As examples, we present experimental results of Ti 3p-3d resonant IPES of the Mott insulator YTiO3, which is an important material for understanding of the mechanism of metal-insulator transition due to electron correlation, and angle-resolved IPES of LaB6(001), which is used as an electron source. Finally, we report a spin polarized electron gun in progress.

  • X-ray Absorption and Inverse Photoemission Study of Y1-xCaxTiO3
    Journal of the Physical Society of Japan, 2007
    Co-Authors: Masashi Arita, Hirofumi Namatame, Masaki Taniguchi, Hitoshi Sato, Kenya Shimada, M. Higashi, K. Yoshikawa, Masahiro Sawada, Y. Ueda, Sin-ichi Fujiomori
    Abstract:

    We have performed the O 1 s x-ray absorption (XAS) and resonant Inverse Photoemission spectroscopy (RIPES) in Mott insulator YTiO 3 , band insulator CaTiO 3 and Y 0.61 Ca 0.39 TiO 3 with a metal–in...

  • ELECTRON OPTICS WITH CYLINDRICAL DEFLECTOR FOR SPIN-RESOLVED Inverse Photoemission SPECTROSCOPY
    Surface Review and Letters, 2002
    Co-Authors: S. Qiao, Hirofumi Namatame, Akio Kimura, A. Morihara, S. Hasui, E. Kotani, H. Takayama, Kenya Shimada, Masaki Taniguchi
    Abstract:

    For a spin-resolved Inverse Photoemission spectrometer, the most important component is the electron optics system consisting of a 90° deflector and lenses to transfer the spin-polarized electrons from a GaAs photocathode to the sample at high transmission. We adopt a cylindrical deflector when we construct a spin-resolved Inverse Photoemission spectrometer. A performance test shows that our electronic optics system has achieved 83% transmission, and also that the cylindrical deflector has no shortcoming compared to the spherical type.

  • Inverse-Photoemission studies of the conduction bands in amorphous Ge
    Journal of Non-crystalline Solids, 1999
    Co-Authors: Shinya Hosokawa, Hitoshi Sato, Y. Hari, K. Nishihara, Masaki Taniguchi
    Abstract:

    The unoccupied electronic structure of amorphous Ge has been investigated by means of Inverse-Photoemission spectroscopy (IPES). We have observed a structureless spectrum, which is similar to a calculated density of states (DOS) for a metastable crystal (Ge-III) having a complex short-range order. From the comparison between the IPES spectrum and the 2p3/2 and 3d core absorption spectra, the property of the conduction bands has been specified. The joint DOS obtained by a simple convolution of the Photoemission and Inverse-Photoemission spectra is inconsistent with the imaginary part of the dielectric function deduced from the reflectance spectrum, that is, the historic assumption of a constant transition matrix element cannot be adopted.

  • Synchrotron-radiation Photoemission and Inverse Photoemission studies of solids
    Journal of Alloys and Compounds, 1999
    Co-Authors: Masaki Taniguchi
    Abstract:

    Abstract Synchrotron-radiation Photoemission and Inverse Photoemission spectroscopies are powerful techniques to investigate occupied and unoccupied electronic states of solids. In this paper, we demonstrate that in situ measurements of ultraviolet Photoemission and Inverse Photoemission spectra are successfully applied to studies of semiconductors. Our experimental results for Cd 1– x Mn x Te, zincblende (ZB–) and hexagonal NiAs-type (H–) MnTe, trigonal (t-) and glassy (g-) Se, and g-Ge x Se 1− x and g-As x Se 1− x are presented to discuss the Mn 3d spin-exchange splitting energy and degree of hybridization between Mn 3d and sp-band states in Cd 1− x Mn x Te, ZB– and H–MnTe, dominant source of the distinct difference of electronic structures between t- and g-Se, and percolation phenomenon in non-crystalline covalent networks in g-Ge x Se 1− x and g-As x Se 1− x , respectively.

E. Puppin - One of the best experts on this subject based on the ideXlab platform.

  • Monte Carlo simulation of inelastic background in direct and Inverse Photoemission
    Journal of Electron Spectroscopy and Related Phenomena, 1995
    Co-Authors: E. Puppin, E. Ragaini
    Abstract:

    Abstract A simple model is described which allows the inelastic background in direct and Inverse Photoemission spectra to be simulated. The basic physical approximations of the model are described, and the flow diagrams of the Monte Carlo algorithms are presented. The input parameters of the simulation program are the electron inelastic mean free path and the loss function. In order to illustrate the possibilities of this approach we show simulations of direct and Inverse Photoemission spectra. A good agreement between simulation and experiment can be obtained if the loss function is known (high electron energies). For low electron energies such as those encountered in UV Inverse Photoemission the situation is more complex and it is necessary to use model loss function and fit the simulation with the experiment. In this way it is possible to obtain, at least in principle, information on the scattering mechanisms of low energy electrons in solids.

  • New calibration procedure for an Inverse Photoemission spectrograph
    Review of Scientific Instruments, 1992
    Co-Authors: P. Vavassori, E. Puppin
    Abstract:

    A new calibration procedure for determining the instrumental efficiency of a grating‐based Inverse Photoemission spectrograph is described. Our results are in good agreement with those obtained by following another procedure previously adopted by other authors. The new procedure is particularly convenient for Inverse Photoemission experiments conducted in the so‐called ‘‘isochromat’’ mode.

  • Ultraviolet Inverse Photoemission from FeS2
    Solid State Communications, 1992
    Co-Authors: E. Puppin, Marco Finazzi, Franco Ciccacci
    Abstract:

    Abstract We present a set of angle integrated Inverse Photoemission spectra from FeS 2 taken in the ultraviolet region (12−25eV) in the isochromat mode; this is the first application of photon energy dependent isochromat Inverse Photoemission to a transition metal sulfide. It will be shown that the spectra can be simply interpreted in terms of the available single-particle ground state calculations. The data will also be discussed in the light of present theories on correlated systems.

  • Ultraviolet Inverse Photoemission spectroscopy from YFe2
    Solid State Communications, 1991
    Co-Authors: Lucio Braicovich, E. Puppin, Franco Ciccacci, M. Sancrotti, E. Vescovo, Giuseppe Bertuccio
    Abstract:

    Abstract We present Inverse Photoemission results in the ultraviolet (11.3–23eV) from YFe2. The photon energy dependence of k-integrated isochromat spectra gives direct access to the Fe and Y contributions to the density of empty electron states. The measurements are compared with published calculations; it is shown that the position of the mixed Fe(3d)−Y(4d) peak around 2 eV above the Fermi level is particularly critical.

  • UV Inverse Photoemission from FePS3
    Solid State Communications, 1991
    Co-Authors: E. Puppin, M. Scagliotti, C. Chemelli
    Abstract:

    Abstract Angle integrated Inverse Photoemission (IP) spectra from FePS 3 crystals cleaved in ultra high vacuum (UHV) were measured in the photon energy range between 10 and 25 eV. Two peaks are noticed above the Fermi energy: they are assigned to Fe 3 d derived states split by the crystal field, as in this energy region the IP spectra are expected to be very sensitive to d -symmetry orbitals. The photon energy dependence of the IP spectra allows a mixing between the iron 3 d derived states and the sulphur valence states to be pointed out. The experimental data are discussed in connection with the available calculations.

Hirofumi Namatame - One of the best experts on this subject based on the ideXlab platform.

  • Inverse Photoemission Spectroscopy
    Hyomen Kagaku, 2008
    Co-Authors: Hitoshi Sato, Hirofumi Namatame, Masashi Nakatake, Osamu Morimoto, Masaki Taniguchi
    Abstract:

    Inverse Photoemission spectroscopy (IPES) is the powerful technique to directly investigate the unoccupied electronic states of materials. In this technique, electrons are injected to samples, and then emitted photons from the samples are detected. In this article, we describe the outline of IPES including its principle, and apparatuses we have developed and constructed. As examples, we present experimental results of Ti 3p-3d resonant IPES of the Mott insulator YTiO3, which is an important material for understanding of the mechanism of metal-insulator transition due to electron correlation, and angle-resolved IPES of LaB6(001), which is used as an electron source. Finally, we report a spin polarized electron gun in progress.

  • X-ray Absorption and Inverse Photoemission Study of Y1-xCaxTiO3
    Journal of the Physical Society of Japan, 2007
    Co-Authors: Masashi Arita, Hirofumi Namatame, Masaki Taniguchi, Hitoshi Sato, Kenya Shimada, M. Higashi, K. Yoshikawa, Masahiro Sawada, Y. Ueda, Sin-ichi Fujiomori
    Abstract:

    We have performed the O 1 s x-ray absorption (XAS) and resonant Inverse Photoemission spectroscopy (RIPES) in Mott insulator YTiO 3 , band insulator CaTiO 3 and Y 0.61 Ca 0.39 TiO 3 with a metal–in...

  • ELECTRON OPTICS WITH CYLINDRICAL DEFLECTOR FOR SPIN-RESOLVED Inverse Photoemission SPECTROSCOPY
    Surface Review and Letters, 2002
    Co-Authors: S. Qiao, Hirofumi Namatame, Akio Kimura, A. Morihara, S. Hasui, E. Kotani, H. Takayama, Kenya Shimada, Masaki Taniguchi
    Abstract:

    For a spin-resolved Inverse Photoemission spectrometer, the most important component is the electron optics system consisting of a 90° deflector and lenses to transfer the spin-polarized electrons from a GaAs photocathode to the sample at high transmission. We adopt a cylindrical deflector when we construct a spin-resolved Inverse Photoemission spectrometer. A performance test shows that our electronic optics system has achieved 83% transmission, and also that the cylindrical deflector has no shortcoming compared to the spherical type.

  • Activities of Hiroshima Synchrotron Radiation Center — Photoemission and Inverse Photoemission of semiconductors
    Journal of Electron Spectroscopy and Related Phenomena, 1998
    Co-Authors: Masaki Taniguchi, Hitoshi Sato, Hirofumi Namatame
    Abstract:

    Abstract In situ measurements of ultraviolet Photoemission and Inverse Photoemission spectra are successfully applied to studies of the electronic structure of semiconductors. Our experimental results for diluted magnetic semiconductor Cd 1− x Mn x Te, zincblende MnTe and hexagonal NiAs-type MnTe are presented to discuss the Mn 3d spin-exchange splitting energy and degree of p–d hybridization. An outline of Hiroshima Synchrotron Radiation Center, which has incorporated activity on Photoemission and Inverse Photoemission spectroscopies, is presented, with its brief history, role, light sources and beamlines.

  • HIGH-RESOLUTION PHOTON DETECTION SYSTEM FOR Inverse-Photoemission SPECTROSCOPY
    Journal of Electron Spectroscopy and Related Phenomena, 1998
    Co-Authors: Masashi Nakatake, Hirofumi Namatame, Yoshihiro Okamura, S. Akiyama, Masaki Taniguchi
    Abstract:

    Abstract A new type of photon detection system has been developed for Inverse-Photoemission spectrometry. The photon detection system is made up of MgF 2 prisms, two parabolic mirrors and a photon detector, and has a wide solid acceptance angle of 0.35 sr. The energy resolution has been determined to be as high as 94 meV by measuring a line spectrum (Xe i ; 9.569 eV) using this detection system. The overall energy resolution of the Inverse-Photoemission spectrometer consisting of the present photon detection system and of an electron gun with a BaO cathode has been estimated to be 0.30 eV using data collected from polycrystalline Au.

Hiroyuki Yoshida - One of the best experts on this subject based on the ideXlab platform.

Related terms

Inverse Photoemission - 15 days free trial to Access Experts & Abstracts