JOPSS - Search Results

Journal Articles

Precise chemical state analyses of ultrathin hafnium films deposited on clean Si(111)-77 surface using high-resolution core-level photoelectron spectroscopy

Kakiuchi, Takuhiro*; Matoba, Tomoki*; Koyama, Daisuke*; Yamamoto, Yuki*; Kato, Daiki*; Yoshigoe, Akitaka

Surface Science, 701, p.121691_1 - 121691_8, 2020/11

https://doi.org/10.1016/j.susc.2020.121691

Times Cited Count：1 Percentile：6.04(Chemistry, Physical)

Ultrathin hafnium films on Si(111)-77 were studied using synchrotron radiation photoelectron spectroscopies to reveal the chemical states at interface and surface. Ultrathin Hf layers grow on clean Si(111)-77 surface by lever rule. Surface and interface of Hf/Si(111) contain three components (metallic Hf layers, Hf monosilicide (HfSi) and Si-rich Hf silicide). Ultrathin Hf layers changes HfSi $_{2}$ islands on bared Si(111)-77 surface after annealing at 1073 K. It was found that the long axes of the rectangle islands expand the direction connecting the corner holes in DAS model of clean Si(111)-77 surface.

Journal Articles

Oxidation state during growth of very thin oxide on Ti(0001) surface

Takakuwa, Yuji*; Ishizuka, Shinji*; Yoshigoe, Akitaka; Teraoka, Yuden; Moritani, Kosuke; Ogawa, Shuichi*; Mizuno, Yoshiyuki*; Tonda, Hideki*; Homma, Teiichi*

Shinku, 47(6), p.457 - 461, 2004/06

https://doi.org/10.3131/jvsj.47.457

The oxidation reaction of Ti(0001) surface by oxygen molecules was observed by real-time in-situ photoemission spectroscopy using synchrotron radiation in the conditions of 400 $^{circ}$ C and 3.710 $^{-6}$ Pa. The uptake curve of oxygen showed a plateau at the dose of 45-85 L and then increased again. This re-growth of oxide film was attributed to the drastic change of Ti oxidation state from TiO to TiO $_{2}$ . Consequently, the characteristic change of the uptake curve was caused by the oxidation state change of Ti atoms.

Journal Articles

Time resolved photoemission spectroscopy on Si(001)-21 surface during oxidation controlled by translational kinetic energy of O $_{2}$ at room tempearture

Yoshigoe, Akitaka; Teraoka, Yuden

Surface Science, 532-535, p.690 - 697, 2003/06

https://doi.org/10.1016/S0039-6028(03)00412-6

Times Cited Count：22 Percentile：69.44(Chemistry, Physical)

no abstracts in English

Journal Articles

Real-time observation of initial stages thermal oxidation on Si(001) surface by using synchrotron radiation photoemission spectroscopy

Yoshigoe, Akitaka; Moritani, Kosuke; Teraoka, Yuden

Shinku, 46(5), p.424 - 428, 2003/05

https://doi.org/10.3131/jvsj.46.424

In order to study the reaction mechanism of the initial thermal Si(001) oxidation by O $_{2}$ (110 $^{-4}$ Pa) at the surface temperature region between 870K and 1120K, we have performed the synchrotron radiation photoemission spectroscopy of Si-2p and O-1s levels. The oxygen uptake curves as a function of the oxygen exposure time were analyzed on the basis of kinetics. The Si oxidation states corresponding to the adsorbed oxygen amount were well clarified by the time evolution of Si-2p photoemission spectra.

Journal Articles

Empirical evaluation of the thermodynamic and magnetic properties from the atomic distances of NaCl-type actinide compounds

Omichi, Toshihiko*; Arai, Yasuo

Journal of Nuclear Science and Technology, 39(Suppl.3), p.156 - 159, 2002/11

http://www.tandfonline.com/doi/abs/10.1080/00223131.2002.10875432

no abstracts in English

Journal Articles

analysis using synchrotron radiation photoemission spectroscopy for initial oxidation of oxygen preadsorbed Si(001) surfaces induced by supersonic O $_{2}$ molecular beams

Yoshigoe, Akitaka; Teraoka, Yuden

Surface and Interface Analysis, 34(1), p.432 - 436, 2002/08

https://doi.org/10.1002/sia.1332

Times Cited Count：3 Percentile：8.65(Chemistry, Physical)

no abstracts in English

Journal Articles

Real time observation on oxidation states on Si(001) surfaces induced by translational energy of O $_{2}$ using synchrotron radiation photoemission spectroscopy

Yoshigoe, Akitaka; Teraoka, Yuden

Shinku, 45(3), p.204 - 207, 2002/03

https://doi.org/10.3131/jvsj.45.204

no abstracts in English

Journal Articles

Soft X-ray emission and absorption spectra in the 0 K region of microporous carbon and some reference aromatic compounds

Muramatsu, Yasuji; Kuramoto, Kentaro*; Gullikson, E. M.*; Perera, R. C. C.*

Surface Review and Letters, 9(1), p.267 - 270, 2002/02

https://doi.org/10.1142/S0218625X02002178

Times Cited Count：5 Percentile：30.61(Chemistry, Physical)

no abstracts in English

Journal Articles

"In-situ" observation using synchrotron radiation photoemission spectroscopy on initial Si(001) oxidation caused by translational kinetic energy of O $_{2}$

Yoshigoe, Akitaka; Teraoka, Yuden

Shinku, 44(3), p.195 - 198, 2001/03

https://doi.org/10.3131/jvsj.44.195

no abstracts in English

JAEA Reports

Sorption studies of plutonium on geological materials - year 2

J. A. BERRY*; M. BROWNSWORD*; D. J. ILETT*; Linklater, C. M.*; Mason, C.*; TWEED, C. J.*

JNC TJ8400 2000-060, 60 Pages, 2000/02

JNC-TJ8400-2000-060.pdf:2.95MB

Batch sorption experiments have been carried out to investigate the sorption behaviour of plutonium onto basalt and sandstone from the appropriate rock-equilibrated waters under different redox eonditions. Redox Potentials in solution were controlled by the addition of two reducing agents and one oxidising agent. Thermodynamic chemical modelling was undertaken to interpret the results. The sorption models were based on iron oxide. They adequately reproduced the data for sorption of plutonium onto sandstone, but tended to underpredict sorption onto basalt.

JAEA Reports

Sorption studies of plutonium on geological materials

G M N BASTON*; J A BERRY*; M BROWNSWORD*; D J LLETT*; C M LINKLATER*; S W SWANTON*; Tweed, C. J.*

JNC TJ8400 99-078, 72 Pages, 1999/03

JNC-TJ8400-99-078.pdf:3.37MB

A desk study has been carried out to establish the feasibility of measuring the oxidation state of plutonium under near-neutral strongly-reducing conditions. X-ray absorbance spectroscopy appears to be capable of establishing the oxidation state of plutonium sorbed on a suitable substrate. An experimental and modelling investigation has been performed to study the sorption of plutonium onto basalt, mudstone and sandstone under strongly-reducing conditions at three concentrations of carbonate. Appropriate synthetic rock-equilibrated de-ionised water and seawater were used. A model has been developed to describe the sorption of plutonium onto basalt, mudstone and sandstone in de-ionised water and seawater. Predicted R $_{D}$ values are generally in good agreement with the observed experimental measurements. The model is based on sorption of plutonium(III) species and assumes iron oxide is the dominant sorbing phase.