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Goroh Tominaga

Bio: Goroh Tominaga is an academic researcher from University of Tokyo. The author has contributed to research in topics: Bismuth & Adsorption. The author has an hindex of 6, co-authored 11 publications receiving 129 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the adsorption of bismuth on Si(100) surfaces is studied by quadrupole mass spectrometry, LEED and AES, and two different adaption states are observed: one is a two-dimensional phase with saturation coverage and the other is a bulk-like phase without saturation coverage.
Abstract: The adsorption of bismuth on Si(100) surfaces is studied by quadrupole mass spectrometry, LEED and AES. Two adsorption states are observed: one is a two-dimensional (first) phase with saturation coverage and the other a bulk-like (second) phase without saturation coverage. When the two-dimensional phase of Bi was formed at a high substrate temperature, the LEED patterns from the Si surfaces showed an Si(100)2×1 structure with weak fractional order spots. In the Auger amplitude vs. deposition time curves, break points were observed at the completion of the first-phase adsorption. These points shift towards the higher coverage side with decreasing substrate temperature during deposition in accordance with the increase in the amount of adsorbed bismuth atoms.

31 citations

Journal ArticleDOI
Akira Kawazu1, Yukio Saito1, N. Ogiwara1, T. Otsuki1, Goroh Tominaga1 
TL;DR: In this paper, the growth processes of bismuth films on Si(111) surfaces were studied using quadrupole mass spectrometry, AES, and LEED, and the LEED pattern from these surfaces showed a Si(1) √ 3 × √3−30° -Bi structure.

25 citations

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TL;DR: In this paper, the authors measured the resistivity of thin Bi films on silicon and compared the result of a numerical calculation based on the equation which was proposed by Mayadas and Shatzkes.

21 citations

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TL;DR: In this article, it was found that PSD of positive ions from LiF is due to the interatomic Auger transition and the yield spectrum of F+ ions is different from that of Li+ ions above 60 eV.
Abstract: Photon stimulated desorption (PSD) of positive ions from LiF is observed in the photon energy region between 30 and 70 eV. The creation of the Li+(1s→2s) core exciton leads to the rapid rise of both Li+ and F+ desorption yields. It is found that PSD of positive ions from LiF is due to the interatomic Auger transition. The yield spectrum of F+ ions is different from that of Li+ ions above 60 eV. The F+ yield spectrum has a deep valley at around 63 eV, while the Li+ spectrum shows a plateau in the same region. However the difference in the yield spectra of Li+ and F+ ions can not be explained at present.

16 citations

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TL;DR: In this paper, mass spectrometric measurements on the initial stage of the growth process of bismuth film on Si(111) surfaces have been made using an impinging molecular beam containing Bi and Bi2.

13 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors present a review of the use of the Auger electron spectroscopy (AS-t plots) for the analysis of adsorbed quantities in the range from submonolayers to several monolayers.

396 citations

Journal ArticleDOI
TL;DR: A critical review of recent extensive studies of semiconductor surface states by photoelectron spectroscopy is given in this article, focusing on Si, Ge and GaAs surfaces, but other III-V as well as II-VI and IV-VI semiconductor surfaces are also discussed.

167 citations

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TL;DR: In this paper, experimental techniques and instrumentation for space plasma imaging in fluxes of ENAs are reviewed, and a brief history of ENA experimental studies and their properties is presented.
Abstract: Experimental techniques and instrumentation for space plasma imaging in fluxes of energetic neutral atoms (ENAs) are reviewed. ENAs are born in charge exchange collisions between space plasma energetic ions and background neutral gas. ENAs are ubiquitous in the space environment and their energies are in the range from a few eV up to >100 keV. Contrary to charged particles, ENAs can travel large distances through space with minimal disturbance, and by recording ENA fluxes as a function of observational direction, one can reconstruct a global image of a planetary magnetosphere or the heliosphere. Plasma ion energy distribution and ion composition can be remotely established by measuring ENA energies and masses. ENA imaging opens a new window on various phenomena in space plasmas with a promise to qualitatively improve our understanding of global magnetospheric and heliospheric processes. At first we review ENA fluxes in space and their properties, and present a brief history of ENA experimental studies and...

161 citations

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TL;DR: The bismuth microbolometer is a simple, easily made detector suitable for use throughout the far-infrared, which has been integrated with a variety of planar antennas as mentioned in this paper.
Abstract: The bismuth microbolometer is a simple, easily made detector suitable for use throughout the far-infrared, which has been integrated with a variety of planar antennas. The general thermal properties of these devices and some of the constraints on bolometer materials are discussed. The fabrication and performance of several different types of microbolometers and microthermocouples are described.

114 citations

Journal ArticleDOI
TL;DR: In this article, the authors examined Bi-induced surface structures of Si(001), formed in the vicinity of its desorption temperature, by means of scanning tunnelling microscopy and reflection high-energy electron diffraction.

87 citations