(e,2e) momentum spectroscopy of thin films

Storer, P.; Cai, Y. Q.; Canney, S. A.; Caprari, Robert S.; Clark, S. A.; Kheifets, A. S.; McCarthy, Ian E.; Utteridge, S.; Vos, Maarten; Weigold, E.

doi:10.1063/1.49827

Cited by 5 publications

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“…1 This was demonstrated by a series of (e,2e) experiments on solid targets [2][3][4][5][6][7][8][9][10] in the last few years. In these experiments, the (e,2e) spectrometer 11 of The Flinders University of South Australia was used.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the energy-resolved momentum distribution of electrons in valence bands 5,[8][9][10] and core levels, 4,9 which can be uniquely measured by EMS, information has also been obtained on the influence of lattice order on the electronic structure, 6 the electronic structure of adsorbates, 7,9 and the annealing effects on the electronic structure of the surface. 3 The targets used in these investigations include carbon ͑amorphous carbon, graphite, highly oriented pyrolitic graphite, and diamondlike amorphous carbon͒, semiconductors ͑amorphous silicon and amorphous germanium͒, and a semiconductor compound ͑polycrystalline silicon carbide͒. In fact EMS is now being applied to the study of a wide range of materials.…”

Section: Introductionmentioning

confidence: 99%

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Electronic-structure investigation of oxidized aluminum films with electron-momentum spectroscopy

et al. 1996

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Electron-momentum spectroscopy ͑EMS͒ or (e,2e) measurements with oxidized aluminum thin films have been performed. Due to the surface sensitive nature of the EMS spectrometer employed, the measured (e,2e) events come from the front oxidized layer as viewed by the electron detectors. The measurements show clearly two major features in the spectral momentum density distribution and they are related to the upper valence band and the lower valence band of aluminum oxide. The first is a ''dual parabola'' energy-momentum dispersion pattern spanning about 8 eV in the upper valence band. This dual parabola pattern has been qualitatively reproduced by a linear muffin-tin orbital ͑LMTO͒ calculation on spherically averaged ␣-Al 2 O 3 with nearly the same energy span. In the lower valence band, the LMTO calculation indicates a dispersion spanning about 5 eV, and the measured spectral momentum density plot shows a similar ''bowl'' shape but with less dispersion. The possible causes that blur the dispersion in the lower valence band are discussed. Other features in the spectral momentum density distribution are also discussed and compared with the LMTO calculation. ͓S0163-1829͑96͒08147-7͔

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electronic-structure investigation of oxidized aluminum films with electron-momentum spectroscopy

et al. 1996

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“…1. The non-coplanar kinematics of (a) the Flinders [7] with Dk the change of momentum of the incoming and outgoing electrons due to elastic scattering.…”

Section: Kinematicsmentioning

confidence: 99%

“…ly acquired over a range of f , f and E , E [7,9]. f s f s [6] to around 0.9 eV in the 20 keV multichannel In both cases under normal settings the measurespectrometer of the Flinders group [7,8] and around ments give a slice of the spectral momentum density 1.5 eV for the new ANU 50 keV multichannel through zero momentum (a G point) along the y spectrometer [9].…”

Section: Introductionmentioning

confidence: 97%

“…The arrangement also helps in meeting the parameter detectors, where a range of emitted enerpower supply stability requirements. For the main gies is detected simultaneously, the contribution of 625 keV high voltage supplies it is only necessary to the energy spread to the momentum spread may be term drift compensation is achieved by measuring detected electron is recorded online in the multithe midpoint potential of an accurate and highly parameter data acquisition systems of Storer et al [7] stable temperature controlled divider chain that and Vos et al [9], the momentum conservation Eq. connects the output of both power supplies.…”

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Developments in the measurement of spectral momentum densities with (e,2e) spectrometers

Vos

Weigold

2000

Journal of Electron Spectroscopy and Related Phenomena

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The introduction of multiparameter high energy electron momentum spectroscopy (EMS) spectrometers, with high energy and momentum resolution and coincidence count rates, has made it possible to obtain detailed information on the electronic structure of condensed matter and surfaces. In particular it gives direct information on the spectral-momentum density of the material under study, which may be a single crystal, polycrystalline, or amorphous. The first such spectrometer, the Flinders University spectrometer, uses asymmetric kinematics in the measurement of the energies and momenta of the two outgoing electrons in the (e,2e) collision. The new ANU spectrometer uses symmetric kinematics and much higher energies. It is therefore less affected by deleterious multiple-scattering events. On the other hand the Flinders spectrometer is surface sensitive, whereas the ANU spectrometer is more bulk sensitive. Some aspects of EMS measurements of condensed-matter specimens and the performance of the two spectrometers are discussed.

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A high sensitivity momentum dispersive multichannel electron momentum spectrometer for studies in experimental quantum chemistry

Todd

Lermer

Brion

1994

Review of Scientific Instruments

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Articles you may be interested inA high-sensitivity angle and energy dipersive multichannel electron momentum spectrometer with 2π angle range Rev. Sci. Instrum. 82, 033110 (2011); 10.1063/1.3568744 (e, 2e) electron momentum spectrometer with high sensitivity and high resolution Rev. Sci. Instrum. 76, 063103 (2005); 10.1063/1.1897668A high sensitivity electron momentum spectrometer with simultaneous detection in energy and momentum Rev.The design and characterization of a high sensitivity multichannel momentum dispersive electron momentum spectrometer is reported. Electron pair coincidences are detected over a 4-30' range of azimuthal angle at the exit slit of a cylindrical mirror analyzer configured to measure symmetric (0=45') noncoplanar (e,2e) scattering. A position sensitive microchannel plate/resistive anode encoder electron detector and a channeltron electron multiplier are employed in a novel multichannel coincidence detection system based upon detection of "pile-up" of pairs of timing pulses from the detectors. Proof-of-concept results, exhibiting significantly higher coincidence count rates and statistical precision than have been previously observed in electron momentum spectroscopy, are presented for argon.

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(e,2e) momentum spectroscopy of thin films

Cited by 5 publications

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Electronic-structure investigation of oxidized aluminum films with electron-momentum spectroscopy

Electronic-structure investigation of oxidized aluminum films with electron-momentum spectroscopy

Developments in the measurement of spectral momentum densities with (e,2e) spectrometers

A high sensitivity momentum dispersive multichannel electron momentum spectrometer for studies in experimental quantum chemistry

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