VUV beamline (4–50 eV) with a 1 m Seya–Namioka monochromator for surface studies

Namba, Hidetoshi; Masuda, M.; Kuroda, Haruo; Ohta, Toshiaki; Noda, Hideyuki

doi:10.1063/1.1140888

Cited by 18 publications

(6 citation statements)

References 3 publications

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“…All the STM images were taken in the constant-current mode at 65 K. The ARPES measurements were performed using synchrotron radiation on the vacuum ultraviolet (h ϭ5 -40 eV) beam line BL-7B ͑Research Center for Spectrochemistry, the University of Tokyo͒ at Photon Factory, Japan. 28 It is equipped with an angle-resolved photoelectron spectrometer ͑ADES 400, Vacuum Generator͒, a LEED optics, a quartz crystal thickness monitor, and a sample manipulator with a cryostat. [29][30][31][32] The base pressure of this system was ϳ1ϫ10 Ϫ10 mbar during the experiment.…”

Section: Methodsmentioning

confidence: 99%

Growth and electron quantization of metastable silver films on Si(001)

et al. 2001

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The growth morphology and the electronic structures of thin metastable Ag films grown on the Si͑001͒2 ϫ1 surface at low temperatures are investigated by scanning tunneling microscopy and angle-resolved photoemission spectroscopy using synchrotron radiation. The morphology of Ag films exhibits a strong thickness and temperature dependence indicating an intriguing growth mechanism. The as-deposited film at ϳ100 K is composed of nanoclusters with flat tops in a uniform quasi-layer-by-layer film at 2-3 ML and of homogeneous clusters having more three-dimensional ͑3D͒ character above ϳ5 ML. By subsequent annealing at 300-450 K, flat epitaxial Ag͑111͒ films are formed at a nominal coverage larger than 5 ML, while a percolating network of 2D islands is formed at a lower coverage. For the optimally annealed epitaxial films, discrete Ag 5s states are observed at binding energies of 0.3-3 eV together with the Ag͑111͒ surface state. The discrete electronic states are consistently interpreted by a standard description of the quantum-well states ͑QWS's͒ based on phase-shift quantization. No such well-defined QWS is observed for the films with a coverage less than ϳ5 ML. The phase shift, the energy dispersion, and the thickness-versus-energy relation of the QWS's of the epitaxial Ag͑111͒ films are consistently derived. The QWS's in photoemission spectra show two distinctive types of the photonenergy dependence in their binding energies; the oscillatory shifts for hϭ5 -15 eV and no such shift at h ϭ20-25 eV. This can be explained in terms of the different final states in the photoemission process.

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Section: Methodsmentioning

confidence: 99%

Growth and electron quantization of metastable silver films on Si(001)

et al. 2001

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“…Experiments were carried out by use of an ARUPS apparatus based on beam line ADES 400 (VG Scientific) at BL7-B [7] in Photon Factory, National Laboratory for High Energy Physics by using linearly polarized radiations in the photon energy range from 5 to 50 eV, the base pressure of the apparatus being under 1 x 10 " 8 Pa. Samples of Ni(79 11) were obtained by spark cutting a Ni single crystal rod (Johnson Matthey, 5N).…”

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confidence: 99%

Electronic states localized at step edges on Ni(7 9 11) surfaces studied by angle-resolved photoelectron spectroscopy

et al. 1993

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Electronic states of Ni(7 9 11) surfaces were studied by angle-resolved ultraviolet photoelectron spectroscopy using synchrotron radiation. The existence of a surface electronic state characteristic of the step and one associated with the terrace is shown from studies of the effect of alkali metal adsorption and the polarization dependence of photoelectron spectra.PACS numbers: 73.20.At, 79.60.Bm Electronic states of plane surfaces of metal single crystals have been extensively investigated by angle-resolved ultraviolet photoelectron spectroscopy (ARUPS). The existence of surface electronic states with twodimensional nature on those surfaces has been revealed through studies of photon energy dependence and angular distribution of photoelectron spectra [1], On a stepped surface of a metal crystal, there are periodical rows of monatomic steps or kinks separated by terrace planes. One could expect the formation of some new electronic states localized at step edges. Such electronic states might exhibit more or less one-dimensional character. Although ARUPS experiments were carried out on stepped metal surfaces, experimental identification of the electronic state specific to steps has been unsuccessful so far [2][3][4][5]. Therefore it is widely believed that no specific electronic state exists at steps possibly because of the derealization of electrons in metals. However, there is the possibility that the photoelectron signals due to step electronic states overlap those of the bulk and terrace electronic states, and are hard to separate from the latter in the ARUPS experiments utilizing an inert-gas discharge lamp as the stimulating light. When the synchrotron radiation (SR) is used, one could obtain much information by tuning the photon energy of stimulating light and by changing the polarization direction. In this Letter, we report the results obtained by ARUPS experiments utilizing SR on a Ni(79 11) =5(11 l)x(TOl) stepped surface and its alkali-adsorbed states. We have found for the first time evidence for the existence of new electronic states localized at step edges [6].Experiments were carried out by use of an ARUPS apparatus based on beam line ADES 400 (VG Scientific) at BL7-B [7] in Photon Factory, National Laboratory for High Energy Physics by using linearly polarized radiations in the photon energy range from 5 to 50 eV, the base pressure of the apparatus being under 1 x 10 " 8 Pa. Samples of Ni(79 11) were obtained by spark cutting a Ni single crystal rod (Johnson Matthey, 5N). Sample surfaces were first polished mechanically and electrochemically in air and then cleaned by repeated cycles of Ar + sputtering and annealing at 800 °C within the experimental apparatus. It was confirmed by means of the incident energy dependence of the LEED pattern that, on the clean surface, the periodical rows of monatomic steps expected for Ni(79 11) surfaces were arranged along [T2l] as illustrated in Fig. 1. The geometry of ARUPS measurements is also shown in Fig. 1. The electric vector of incident light and the direction...

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“…10 The detailed experimental setup and procedures for the sample preparation are the same as reported before. 6 A wellordered SD Si(001)(2ϫ1) surface was prepared as the substrate and a SD Si(001)c(6ϫ2)-Ag surface was formed by a deposition of ϳ0.6-ML Ag at room temperature and a sub-sequent annealing at ϳ200°C as reported before.…”

Section: Methodsmentioning

confidence: 99%

Electronic structure of theSi(001)c(6×2)-Ag surface studied by angle-resolved photoelectron spectroscopy using synchrotron radiation

et al. 1999

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The surface electronic structure of the single-domain Si(001)c(6ϫ2)-Ag surface has been studied by polarization-dependent angle-resolved photoelectron spectroscopy ͑ARPES͒ using synchrotron radiation. Through detailed ARPES measurements, the Si(001)c(6ϫ2)-Ag surface is found to be semiconducting with a band gap larger than ϳ0.7 eV. Three different surface states are identified within the bulk band gap, whose dispersions and symmetry properties are determined. The surface band structures observed have a close resemblance with those of the Si (001)(2ϫ3)-Ag surface reported recently ͓H. W. Yeom et al., Phys. Rev. B 57, 3949 ͑1998͔͒. This result suggests a similarity between the substrate reconstructions of the c(6ϫ2)-Ag and (2ϫ3)-Ag phases formed at a proximate condition. The surface structure of Si(001)c(6ϫ2)-Ag and the origins of the surface states observed are discussed.

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VUV beamline (4–50 eV) with a 1 m Seya–Namioka monochromator for surface studies

Cited by 18 publications

References 3 publications

Growth and electron quantization of metastable silver films on Si(001)

Growth and electron quantization of metastable silver films on Si(001)

Electronic states localized at step edges on Ni(7 9 11) surfaces studied by angle-resolved photoelectron spectroscopy

Electronic structure of theSi(001)c(6×2)-Ag surface studied by angle-resolved photoelectron spectroscopy using synchrotron radiation

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