Updated on 2024/04/23


OSHIMA, Chuhei
Faculty of Science and Engineering
Job title
Professor Emeritus
Doctor of Engineering ( Tohoku University )

Research Experience

  • 1988

    Waseda University

  • 1988

    Prof. Waseda University

  • 1972

    無機材質研究所 研究員/主任研究官

  • 1972

    Researcher, National Institute for Research


    in Inorganic Materials

Committee Memberships

  • 2002

    日本表面科学会  理事

  • 2002

    Japanese Society of Surface Science  director

Professional Memberships








    Japanese Society of Surface Science

Research Interests

  • 電子ビーム関連技術

  • 表面界面物性

  • 超伝導電子エミッター

  • 電子ビーム

  • 表面フォノン

  • 表面物理

  • Applied Electron Beam

  • Superconducting electron emitter

  • Electron beam

  • Surface phanon

  • Surface physics

▼display all


  • 日本顕微鏡学会 学会賞(瀬籐賞)


  • Setou Award ( The Japnase Society of Microscopy)


  • 日本表面科学会 学会賞


  • Surface Science Award



Research Projects

  • 超コヒーレント電子ビームの開発


    Project Year :


  • Development of Ultra coherent Electron beam

    Research for the Future Program

    Project Year :


  • グラファイト・h-BNの物性

  • 表面フォノンの研究

  • 超コヒ-レント電子ビ-ムの開発


  • Demountable single-atom electron source

    Chuhei Oshima, Eiji Rokuta, Takahiro Itagaki, Tsuyosi Ishikawa, Bokurai Cho, Hong-Shi Kuo, Ing-Shouh Hwang, Tien T. Tsong

    e-Journal of Surface Science and Nanotechnology   3   412 - 416  2005.12

     View Summary

    We report emission properties of single-atom tips, noble electron sources terminated with a single atom. The repairing function of the sources, which had been already demonstrated by using field ion microscope [Fu, et al. Phys. Rev. B 64, 113401 (2001)], was confirmed by using field emission microscopy, and in addition, the demountable character was demonstrated repeatedly. The brightness of the collimated beam emitted from the single-atom tips was estimated to be an order of 1010 A/cm2/str. (E ∼ 2 keV), which is two orders of magnitude higher than those of the conventional field emission sources. There appeared an extra shoulder in the energy spectra, which is strongly correlated with a single-atom ended structure. The fluctuation of the emission current exhibited step-and spike-like noises, which were typical features of nano-electron sources. The single-atom sources are promising candidates of the electron sources in high-performance electron-beam instruments. © 2005 The Surface Science Society of Japan.

    DOI CiNii

  • Novel macroscopic BC3 honeycomb sheet

    H Tanaka, Y Kawamata, H Simizu, T Fujita, H Yanagisawa, S Otani, C Oshima

    SOLID STATE COMMUNICATIONS   136 ( 1 ) 22 - 25  2005.10

     View Summary

    We have successfully grown a uniform BC3 honeycomb sheet with high crystalline quality over the entire macroscopic area of the NbB2 (0001) surface by carbon-substituted technique in a boron honeycomb. This is the first macroscopic uniform sheet of single-crystal BC3 with a monolayer thickness. So far, only BC3 micro-crystals with radii of a few nanometres were produced. The properties of the sheet have been investigated by using XPS, AES, LEED, STM, ARUPS and HREELS. All the experimental data and the theoretical calculations, which are concerning with atomic structure, chemical concentration, and phonon structure, indicated that the uniform BC3 honeycomb sheet was grown in an epitaxial manner to the substrate lattice. (C) 2005 Elsevier Ltd. All rights reserved.

    DOI CiNii

  • Novel structures of carbon layers on a Pt(111) surface

    T Fujita, W Kobayashi, C Oshima

    SURFACE AND INTERFACE ANALYSIS   37 ( 2 ) 120 - 123  2005.02

     View Summary

    The growth behaviour of carbon layers formed on a Pt(111) surface has been investigated by means of scanning tunnelling microscopy. A carbon layer with a (root19 x root19)R23.4degrees structure was grown by benzene exposure of 3 L at 1000 K. After exposure of >10 L, graphene islands with hexagonal shapes appeared in the surface terraces. The graphene islands grew beyond step edges, and their growth often caused bunching of the step edges by Pt atom migration. Copyright (C) 2005 John Wiley Sons, Ltd.

    DOI CiNii

  • Surface structure analysis of Zr-O/W(100) at high temperature by x-ray photoelectron diffraction

    K Tamura, M Amano, WG Chu, H Ishii, M Owari, T Kawano, T Nagatomi, Y Takai, CH Oshima, R Shimizu, Y Nihei

    SURFACE AND INTERFACE ANALYSIS   37 ( 2 ) 217 - 220  2005.02

     View Summary

    Temperature dependence of the surface structure of Zr-O/W(100) was obtained by low-energy electron diffraction observation to check the phase transition of the surface. After flashing the Zr-O/W(100) to 1500 K, the c(2 x 4) + c(4 x 2) double-domain structure was clearly observed at room temperature. This surface changed to the p(1 x 1) phase over 1300 K, accompanied by a decrease in the work function. The temperature dependence of the work function was obtained from the shift of the energy distributions of secondary electrons. The reversible phase transition of the Zr-O/W(100) surface and the decrease in the work function of 2 eV at high temperature were checked. X-ray photoelectron diffraction (XPD) measurements at 1500 K have been performed to investigate the surface structure at the working temperature of the Zr-O/W(100) electron emitter. The O1s XPED pattern included some patterns that can be regarded as the influence of Zr-O complexes on the W(100) surface. Copyright (C) 2005 John Wiley Sons, Ltd.

    DOI CiNii

  • Atomic-scale field emitter with self-reparing function and thermodynamically stable structure

    E.Rokuta, T.Itagaki, D.Miura, T.Moriyama, T.Ishikawa, B-L Cho, C.Oshima

    applid. Surface Science   251 ( 1-4 ) 205 - 209  2005


  • Surface structural analysis of monolayer films composed of light elements by x-ray photoelectron diffraction

    H Nakamura, N Fujihara, M Nojima, K Tamura, H Ishii, M Owari, C Oshima, Y Nihei

    SURFACE AND INTERFACE ANALYSIS   36 ( 12 ) 1513 - 1515  2004.12

     View Summary

    For surface structural analysis on monolayer films composed of light elements, we investigated theoretical x-ray photoelectron diffraction (XPED) patterns from single-molecule adsorbing surfaces by using both Cr Lalpha (572.8 eV) and Al Kalpha (1486.6 eV) excitations. Forward-scattering peaks and Kikuchi-like bands were clearly observed in the pattern excited by Al Ka. In contrast, the features of the XPED patterns excited by Cr La were more diffuse. However, the circular patterns excited by Cr La are clearer than those excited by A1 Kalpha. This result suggests that the use of a lower energy x-ray source improves XPED structural analysis on ultrathin films composed of light elements. Copyright (C) 2004 John Wiley Sons, Ltd.


  • 大立体角エネルギ-分析器(II)

    真空 /日本真空協会   47  2004

  • Energy spectra of field emission electrons from multiwalled carbon nanotubes

    C Oshima, K Matsuda, T Kona, Y Mogami, T Yamashita, Y Saito, K Hata, A Takakura

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B   21 ( 4 ) 1700 - 1704  2003.07

     View Summary

    We have measured energy spectra of field emission (FE) electrons from multiwalled carbon nanotubes in various conditions such as a tip temperature, electric fields, the emission direction, and adsorption. The observed spectra indicated that peak near E-F originated from the FE electrons from the inner walls, while FE electrons forming the shoulder at deeper energy came from a surface wall. Both the position and the intensity of the shoulder changed from one specimen to the others; no spectra were the same as the others. The Fermi level of the surface wall is different from that of the inner walls under the FE condition. (C) 2003 American Vacuum Society.


  • Growth of Carbon Nanotubes Charcterized by Field Electron Emission

    Ultramicroscopy / Elsevier Sicence   95  2003

  • Coherent electron, emission from carbon nanotubes: asymmetric Young's interference fringes

    T Yamashita, K Matsuda, T Kona, Y Mogami, M Komaki, Y Murata, C Oshima

    SURFACE AND INTERFACE ANALYSIS   35 ( 1 ) 113 - 116  2003.01

     View Summary

    We have calculated the Young's interference of two electron beams that are asymmetrical about the emission current and/or emission area and compared them with the experimental results of field emission patterns from multi-walled carbon nanotubes. Most of the fringes observed from the clean surface were similar to those produced with the symmetric slit system, which corresponds to the fact that asymmetry in intensity does not change the fringe shape. In addition, no interference fringes of the two asymmetrical beams about the area were detected. Molecular chemisorption enhanced the emission current at an emission site, but the electron waves were incoherent to the others. Copyright (C) 2003 John Wiley Sons, Ltd.


  • Coherence electrons emitted from Carbon nanotubes and Nb Superconductor

    J. Phys. Sociery of Japan / 日本欧文誌刊行会・日本物理学会   17  2003

  • ナノ領域から電界放出される電子波の干渉

    固体物理/アグネ出版   38  2003

  • Hetero-epitaxial system of h-BN/Monolayer graphite on Ni(111)

    Surface Review Letter/ World Scicence publisher   10  2003


  • Hetero-Epitaxila system ofmonolayer graphite / h-BN on Ni(111)

    Surface Review Letter   10  2003

  • Dependence of photoelectron diffraction of single molecular adsorbing Ni(111) surface

    H.Nakamuara, K.Tamura, H.Ishii, M.Owari, C.Oshima, Y.Nihei

    BUnseki Kagaku   52   859 - 863  2003


  • 電界電子放出と表面科学

    表面科学   23,1  2002

  • Young's Interference of Electrons in Field Emission Patterns

    Phys. Rev. Lett.   88,3  2002

  • Adsorption and desorption of benzene on Si(111)-7 X 7 studied by scanning tunnelling microscopy

    T Kawasaki, D Sakai, H Kishimoto, AA Akbar, T Ogawa, C Oshima

    SURFACE AND INTERFACE ANALYSIS   31 ( 2 ) 126 - 130  2001.02

     View Summary

    The atomic-scale processes of benzene adsorption and desorption on an Si(111)-7x7 surface have been investigated with scanning tunnelling microscopy. Analysis of the atomic-scale images obtained during the adsorption and desorption processes yielded the following results: benzene molecules adsorbed on Si(111)-7x7 with the di-sigma bonds between molecules and two Si atoms, an adatom and a rest atom; and benzene molecules chemisorb and desorb through physisorption states. Copyright (C) 2001 John Wiley & Sons, Ltd.


  • 大立体角電子エネルギ-分析器の試作

    真空   44  2001


  • Field Emission Microscopy of Carbon Nanotubes

    Perspectives of Fullerene Nanotechnology, Kluwer Academic Publishers    2001

  • Electron Emission Sites on Carbon Nanotubes and the Energy Spectra

    Jpn.J/Appl. Phys.   40  2001


  • Field emission spectroscopy from field-diffusion-growth nanotips

    Applied Surface Science   182  2001


  • Modification of the surface phonon dispersion of a graphite monolayer adsorbed on Ni (111) caused by intercalation of Yb, Cu and Ag,

    Surface Science   454-456, (2000) 437- 441.  2000


  • Pt(755)とTiC(755)上に成長させた単原子層グラファイトの電子状態

    炭素   195,(2000)400-404.  2000


  • Hetero-Epitaxial Double Atomiclayer Graphene/ Monolayer h-BN Studied by HREELS

    Inst. Phys Conf. Ser   No 165, (2000) 31  2000

  • Structure of TiC(100) Surface Studied with Low-Energy Electron Diffrcation Intensity Analysis

    Phys. Rev.   B63 (2000) 073407  2000

  • A hetero-epitaxial Multi-Atomic Layer system of garphene and h-BN

    Surface Revies and Letters   5&6, (2000) 521-526.  2000

  • A hetero-epitaxial- double- atomic layer system of monolayer Graphite/monolayer h-BN on Ni(111)

    Solid State Communications   116 (2000) 37-40.  2000


  • Ultra-Coherent Electron Beams

    Electronmicroscopy   35, (2000) 272-275.  2000

  • Field emission spectra from a superconducting Nb tips

    Inst. Phys Conf. Ser   No 165 (2000) 481-483.  2000

  • Angular resolved emission spectra from Nb .

    Applied Surface Science   130-132, pp512-517  1998

  • Monochromatic electron emission from the macrostopic quantum state,

    Nature   396,pp557-559  1998


  • Deformation of boron network at Lathanum boride (111) surface

    Surface Science   416, pp 363-370  1998

  • Electronic states of monolayer micrographite on TiC(410) surface,

    Applied Surfcae Science   130-132, pp 876882  1998

  • グラファイト・ナノクリスタルおよびグラファイト・ナノリボンの作製

    、炭素   180;229  1997


  • An apparatus for high resolution field emission spectroscopy

    Advances in Colloid and Interface Science   71/72 ; 353  1997


  • 単原子層六方晶窒化ホウ素のフォノン

    日本物理学会誌   52;610  1997


  • Surface Phonons of Lanthanum Hexaboride and its Thermionic Properties

    ROKUTA Eiji, NAGAO Tadaaki, OSHIMA Chuuhei

    Journal of the Vacuum Society of Japan   40;77 ( 2 ) 77 - 83  1997

    DOI CiNii

  • Phonon Dispersion of an Epitaxial Monolayer Film of Hexagonal Boron Nitride on Ni(111)

    Phys.Rev. Lett.   79;4609  1997


  • High resolution field emission spectra from Niobium (100) tip

    Sci. Rep. RITU   A44; 257  1997

  • Atomic structural analysis of a monolayer epitaxial Film of Hexagonal boron nitride/ Ni(111) by LEED intensity analysis

    Sci. Rep. Ritu   A44;211  1997

  • Characterization of ultra thin films by High Resolution Electron Energy Loss Spectroscopy

    J.Surface Analysis   3;322  1997

  • Electronic band structure ofmonolayer hexagonal boron nitride on TaC(111)

    J. Surface Analysis   3 ;473  1997

  • Atomic structure of monolayer graphite formed on Ni(111)

    Surface Sci.   374;61  1997


  • Ultra-Thin epitaxial films of graphite and boron nitride on Solid Surfaces

    J. Phys.; Condens. Matter   9;1  1997


  • Surface Phonons Na and Li-induced superstructures on Al(111),

    Phys. Rev.   B55; 10064  1997


  • Energy Spectra of Field Emission Electrons From a W<310> Tip

    Surface Science   357/358,(1996)371-375  1996


  • 超コヒ-レント電子ビ-ム実現の試み

    表面科学17   (1996)738-744.  1996


  • Ni(111)表面上の単原子層グラファイトの構造解析

    表面科学17   (1996)35  1996


  • Electronic States of Heteroepitaxial Double-layer System

    Phys.Rev.   B 54,(1996)13491-13494.  1996


  • HU,Electronic Spectroscopic Study of Monolayer Hexagonal Boron Nitride Formed on Metal Surfaces

    International J. Modern Physics   B10,(1996) 3517-3537.  1996


  • Electronic States of Monolayer Hexagonal Boron Nitride Formed on the Metal,Surfaces

    Surface Science   357/358,(1996)307-311.  1996


  • Electron Stimulated Desorption Ions of Hydrogen and Deuterium Molecules in Extremely High Vacuum

    Vacuum   47,(1996)571-573.  1996


  • Phonon Dispersion of the LaB6 (111) Surfaces,Surface Sci. 357-358

    Surface Science   357/358,(1996)712-716.  1996

  • Oxygen Adsorption on the LaB6(100) and (111) Surfaces

    Surface Sience   357/358,(1996)708-711.  1996


  • Oxygen Adsorption Sites on the PrB6(100) Surfaces

    Surface Science   348,(1996)133-142.  1996


  • Oxygen Chemisorbed LaB6(100),(110) and (111) Surfaces

    J. Vac. Sci.Technol.   A14,(1996) 1674-1678  1996


  • Energy Ditribution of Field Emission Electrons From a Nb <111> Tip

    Surface Science   357/358,(1996)218-221.  1996

  • 六方晶BNの単原子層エピタキシャル膜

    固体物理/アグネ社   30  1995

  • 高エネルギー分解用多機能電源

    固体物理/アグネ社   30  1995

  • Recent Progress in Experimental Techniques for Investigating Surface Properties.

    OSHIMA Chuhei

    J. Surf. Sci. Soc. Jpn.   16 ( 1 ) 24 - 29  1995

    DOI CiNii

  • Vibrations of Alkali-metal Atoms chemisorped on Al(111)

    Surface Sci./North-Holland   329  1995

  • Performance of an Ionization Gauge with a Large angle deflector (II)

    J. Vac. Sci. Technol./アメリカ物理学会   B13  1995

  • Electronic Structure of Monolayer n-BN

    Phys. Rev. Lett./アメリカ物理学会   75  1995

  • Electronic dispersion relations of Monolayer hexagonal boron Nitride

    Phys. Rev./アメリカ物理学会   B51  1995

  • 電子エネルギー損失分光法

    表面技術/表面技術協会   45  1994

  • Electronic States of Graphite overlayer on TaC(111)

    Superconductor, Surface and Superbittice/Elsevier    1994

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Industrial Property Rights

  • ナノ電子源の製造法


     View Summary


  • 荷電粒子分光器


     View Summary


  • コヒーレント電子源およびコヒーレント電子源応用装置


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Internal Special Research Projects

  • 電界イオン化真空計の研究開発


     View Summary

    極限空間の10{-10}Pa以下の圧力を測定しようとすると、従来の電離真空計では、以下に記述した幾つかの問題が発生し、測定が困難となる。(1)電離を促すための電子は極高真空領域では、残留気体と衝突する確率が減少し(10{-7}%程度)、ほとんど全ての電子は電離作用には寄与せず、グリッドに衝突し、雑音(軟X線や電子励起脱離イオン)の発生源となる。このため、この雑音除去の機構が必要になる。更に、この電子発生のために、真空計内部で約20Wのエネルギ-消費があり、このエネルギ-消費が圧力計測を乱す元凶となっている。 本研究では、エネルギ-消費を数桁に渡って下げた電界イオン化真空計の可能性を検討した。タングステン金属針の鋭く先端に高電圧を印加し、10{8}V/cmの強電界を使って、この電界中に侵入した残留気体の電子トンネルでイオン化させ、このイオンをチャンネルトロンで1個1個数える。真空槽内部にXeガスを導入し、ライボルト社製のエクストラクタ-真空計を参照真空計として、電界イオン真空計の校正を行った結果、以下の結論を得た。 (1)10{-8}Paから10{-4}Paの圧力領域で、参照真空計の示す圧力に対して、比例関係が確認され、真空計として動作することを確認した。 (2)測定で消費されたエネルギ-は、10{-6}W以下である。また当初の目的通り、 軟X線雑音、電子衝撃雑音は皆無にすることができた。 (3)残された問題は感度であり、10{-10}Pa以下の測定には、感度を2桁以上向上させる必要がある。今後、微小マルチイオン源を利用し、10{4}倍の感度向上を試みたい。研究成果の発表C. Oshima, H. Fuji, T. Yamada, S. Uchiyama, K. Nagaoka Coustruction of a low-temperature Gun, Applied Surface sci 624(1999).

  • 極高真空用分圧計測の開発研究


     View Summary

    10-11Pa台の極高真空の圧力を計測するための電離真空計を開発した。静電型イオン偏向器(偏向角255度)の使用により,イオン化室で発生する2種類の雑音(軟X線と電子励起離脱イオン)を除去し,10-13Paまで雑音レベルを下げることができることを示した。電子励起離脱(ESD)イオンは,この圧力領域の最大の雑音であり,この雑音の発生機構を解明することは,極高真空領域の圧力計測にとって極めて有効である。イオン偏向器内部を通過する飛行時間を計測することによって,発生するESDイオンの分子種および運動エネルギーを計測した結果以下の白金グリッドから発生するESDイオンに関する知見が得られた。(1)真空計の動作初期には,ESDイオンとしてはH原子,O原子,CO原子であるが,動作をくり返し,イオン化室を電子で衝撃し続けると,徐々にH原子,O原子,CO原子のピーク強度が減少した。(2)代わって,強度が大きくなるのはH2分子である。H2イオンのエネルギーはHイオンよりも数eV高い。 次に,真空容器内部に重水素を導入してESDイオンの変化を観察した。(3)重水素の導入によって質量数2(D)と4(D2)のイオンが増加した。10-9PaのD2分圧では3-4時間後に増加は停止した。このことは,D2分子は一旦物理吸着し,安定位置を探して化学吸着すると考えられる。(4)この実験では質量数3(HD)のイオンは検出されなかった。D2分子の多くは非解離で吸着している。(5)重水素を排気した場合,D2ピーク位置は徐々に減少し,10時間後にもまだ観測されていた。このことは,D2は化学吸着に相当する結合エネルギーで吸着していることを示している。