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Journal Articles

Marking actinides for separation; Resonance-enhanced multiphoton charge transfer in actinide complexes

Matsuda, Shohei; Yokoyama, Keiichi; Yaita, Tsuyoshi; Kobayashi, Toru; Kaneta, Yui; Simonnet, M.; Sekiguchi, Tetsuhiro; Honda, Mitsunori; Shimojo, Kojiro; Doi, Reisuke; et al.

Science Advances (Internet), 8(20), p.eabn1991_1 - eabn1991_11, 2022/05

 Times Cited Count:0 Percentile:0(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

Orientation of one-dimensional silicon polymer films studied by X-ray absorption spectroscopy

Mannan, M. A.*; Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Hirao, Norie; Nagano, Masamitsu*; Noguchi, Hideyuki*

Journal of Nanomaterials, 2012, p.528256_1 - 528256_9, 2012/00

 Times Cited Count:0 Percentile:0(Nanoscience & Nanotechnology)

Molecular orientations for thin films of one-dimensional silicon polymers grown by vacuum evaporation have been assigned by X-ray absorption fine structure (XAFS) using linearly polarized synchrotron radiation. For XAFS spectra of polydimethlysilane (PDMS) films on highly oriented pyrolytic graphite (HOPG), the intensities of two peaks were found to be strongly polarization dependent. Quantitative evaluation of the polarization dependence of the XAFS spectra revealed that the polymers are oriented nearly parallel to the surface. The observed orientation is opposite to the previously observed results for PDMS on oxide (indium tin oxide) and metal (polycrystalline copper). The flat-lying feature of PDMS observed only on HOPG surface is attributed to the interaction between CH bonds in PDMS and $$pi$$ orbitals in HOPG surface.

Journal Articles

Orientation of one-dimensional silicon polymer films studied by polarization-dependent NEXAFS

Mannan, M. A.*; Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Hirao, Norie; Nagano, Masamitsu*; Noguchi, Hideyuki*

Photon Factory Activity Report 2011, Part B, P. 159, 2012/00

no abstracts in English

Journal Articles

Self-ordering of silicon polymer thin film grown on indium tin oxide surface investigated by X-ray absorption spectroscopy

Mannan, M. A.*; Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Hirao, Norie; Narita, Ayumi; Nagano, Masamitsu*; Noguchi, Hideyuki*

Journal of Electron Spectroscopy and Related Phenomena, 181(2-3), p.242 - 248, 2010/08

 Times Cited Count:5 Percentile:32.67(Spectroscopy)

The ordering and molecular orientation of polydimethylsilane (PDMS) films grown on indium tin oxide (ITO) surface has been assigned. The orientation of the samples as well as that of the annealed sample was studied by Si K-edge near-edge X-ray absorption fine structure (NEXAFS) and X-ray photoelectron spectroscopy using linearly polarized synchrotron radiation. The Si K-edge NEXAFS spectra for the thick film have at least four resonance peaks of which two peaks are found to be strongly polarization dependent. On the basis of the polarization dependences of the peak intensities, it is revealed that the backbones of the PDMS films are perpendicularly oriented on the ITO surface. The angle between surface and the Si-Si bonds for multilayered film calculated from the helical structure of PDMS molecule was found to be 41.5 $$^{circ}$$ which was almost coincided with the experimentally obtained angle of 40 $$^{circ}$$. It was concluded that PDMS molecules are highly self-ordered on ITO surface.

Journal Articles

Photon stimulated ion desorption from condensed thiophene photoexcited around the S 1s-edge

Rocco, M. L. M.*; Sekiguchi, Tetsuhiro; Baba, Yuji

Journal of Vacuum Science and Technology A, 24(6), p.2117 - 2121, 2006/11

 Times Cited Count:9 Percentile:35.35(Materials Science, Coatings & Films)

no abstracts in English

JAEA Reports

Preparation and characterization of B-C-N hybrid thin films

Uddin, M. N.*; Shimoyama, Iwao; Sekiguchi, Tetsuhiro; Nath, K. G.*; Baba, Yuji; Nagano, Masamitsu*

JAEA-Research 2006-034, 72 Pages, 2006/06

JAEA-Research-2006-034.pdf:4.05MB

no abstracts in English

Journal Articles

Synthesis and characterization of oriented graphitelike B-C-N hybrid

Uddin, M. N.*; Shimoyama, Iwao; Baba, Yuji; Sekiguchi, Tetsuhiro; Nath, K. G.*; Nagano, Masamitsu*

Journal of Applied Physics, 99(8), p.084902_1 - 084902_5, 2006/04

 Times Cited Count:4 Percentile:17.68(Physics, Applied)

no abstracts in English

Journal Articles

Substitution effect on orientation of organosilicon compounds (CH$$_{3}$$)$$_{3}$$SiX (X = F, Cl, Br, I, NCO) as studied using NEXAFS spectroscopy

Sekiguchi, Tetsuhiro; Baba, Yuji; Shimoyama, Iwao; Nath, K. G.*; Uddin, M. N.*

Journal of Physics; Condensed Matter, 17(36), p.5453 - 5466, 2005/09

 Times Cited Count:1 Percentile:6.49(Physics, Condensed Matter)

The orientation nature of multilayer organosilicon compounds has been investigated by measuring the dependence of the Si K-shell near-edge X-ray absorption fine structures (NEXAFS) on the polarization angle. Two approaches helped to elucidate the orientation mechanism: the substitution effect and the deposition-rate dependence. The orientation angles of Si-X bond axes were obtained for trimethylsilyl halides, (CH$$_{3}$$)$$_{3}$$SiX (X =F Cl Br I NCO, condensed on Cu(111) at a low (82 K) temperature: the angles are 60, 73, 61, 55, and 55 degrees with respect to the surface normal, for X =F, Cl, Br, I, and NCO, respectively. Chloride (X =Cl) produces the most parallel tilt angle. The specific orientation nature of chloride is attributed to its strong dipole moment as well as the regular tetrahedron shape of the molecule. The molecular volumes calculated verify this view. Furthermore, deposition rates are found to greatly influence the growth manner: namely, high deposition rates led to a slightly perpendicular orientation of Si-X bond axis.

Journal Articles

X-ray photoelectron spectroscopic observation on B-C-N hybrids synthesized by ion beam deposition of borazine

Uddin, M. N.; Shimoyama, Iwao; Baba, Yuji; Sekiguchi, Tetsuhiro; Nagano, Masamitsu*

Journal of Vacuum Science and Technology A, 23(3), p.497 - 502, 2005/05

 Times Cited Count:36 Percentile:76.33(Materials Science, Coatings & Films)

B-C-N hybrid thin films were grown from ion beam plasma of borazine (B$$_{3}$$N$$_{3}$$H$$_{6}$$) on graphite substrate at room temperature, 600$$^{circ}$$C, and 850$$^{circ}$$C. The films were characterized by X-ray photoelectron spectroscopy (XPS). XPS study suggested that B and N atoms in the deposited films are in a wide variety of chemical bonds e.g., B-C, B-N, N-C, and B-C-N. The substrate temperature and ion fluence were shown to have significant effect on the coordination and elemental binding states on the B-C-N hybrids. It was found that B-C-N hybrid formation is enhanced at high temperature, and this component is dominantly synthesized at low fluence. The results imply that it is possible to control the composition of B-C-N hybrid by changing the ion fluence and the temperature during ion implantation.

Journal Articles

B-C-N hybrid synthesis by high-temperature ion implantation

Uddin, M. N.; Shimoyama, Iwao; Baba, Yuji; Sekiguchi, Tetsuhiro; Nath, K. G.; Nagano, Masamitsu*

Applied Surface Science, 241(1-2), p.246 - 249, 2005/01

 Times Cited Count:8 Percentile:38.06(Chemistry, Physical)

Recently, much attention has been given on the synthesis and characterization of graphite-like B-C-N hybrid. Since graphite-like B-C-N hybrid may have semiconducting property, this material is interesting for applications to electronic and luminescent devices. In order to synthesize this material, borazine ion plasma was implanted in graphite at room temperature (RT) and 600 $$^{circ}$$C. An ultrahigh vacuum (UHV) chamber with base pressure $$sim$$10$$^{-7}$$ Pa was used for the experiment. The X-ray photoelectron spectroscopy (XPS) study suggested that B atoms in the deposited films are in a wide variety of atomic environment such as BC3, BN3 and B-C-N hybrid. The ratios of these coordinations strongly depend on the temperature during the ion implantation. It was found that the B-C-N hybrid is predominantly synthesized by the implantation at 600 $$^{circ}$$C where the surface [B]/([B]+[C]+[N]) ratio ranges from 0.1 to 0.35. The results imply that it is possible to control the composition of B-C-N hybrid by changing the fluence of the ion plasma and the temperature of graphite during ion implantation.

Journal Articles

Electron spectroscopy of doubly excited states in He produced by slow collisions of He$$^{2+}$$ ions with Ba atoms

Iemura, K.*; Otani, Shunsuke*; Suzuki, H.*; Takeda, Junichi*; Machida, Shuichi*; Tanabe, K.*; Takayanagi, Toshinobu*; Wakiya, K.*; Sekiguchi, M.*; Kanai, Yasuyuki*; et al.

Physical Review A, 64(6), p.062709_1 - 062709_14, 2001/12

 Times Cited Count:6 Percentile:36.27(Optics)

We measured ejected electron spectra caused by autoionization of doubly excited states in He atoms; the excited He was made by double electron capture of low-energy He$$^{2+}$$ ions colliding with Ba atoms. Measurements were performed by means of zero degree electron spectroscopy at projectile energies from 40 to 20 keV. Electron spectra due to autoionization from the states He(2lnl) to He+(1s) for n$$geq$$2, and those from He(3lnl) to He$$^+$$(2s or 2p) for n$$geq$$3, were observed. Line peaks in the spectra were identified by comparing observed electron spectra with those of several theoretical calculations. It was found that doubly excited states of relatively high angular momenta such as the D and F terms were conspicuously created in a quite different manner from the cases of the production of doubly excited states by the use of photon, electron, or ion impacts on neutral He atoms. Rydberg states with large n values were observed with high population in both the He(2lnl) and He(3lnl) series.

Journal Articles

Production of doubly excited He atoms in collisions of He$$^{2+}$$ ions with aklaline-earth atoms

Iemura, K.*; Suzuki, H.*; Otani, Shunsuke*; Takeda, Junichi*; Takayanagi, Toshinobu*; Wakiya, K.*; Sekiguchi, M.*; Kanai, Yasuyuki*; Kitazawa, Shinichi; Tong, X. M.*; et al.

Atomic Collision Research in Japan, No.25, p.42 - 43, 1999/11

no abstracts in English

Journal Articles

XPS and XANES observations on non-stoichiometric SiN$$_{x}$$ produced by low-energy ion implantation

Ali, M.; Baba, Yuji; Sekiguchi, Tetsuhiro; Li, Y.; Yamamoto, Hiroyuki

Photon Factory Activity Report 1998, P. 36, 1999/11

no abstracts in English

Journal Articles

Extremely high selectivity in fragmentation of (CH$$_{3}$$S)$$_{2}$$ on Si(100) following excitation of adsorbate or substrate core level

Sekiguchi, Tetsuhiro; Baba, Yuji; Li, Y.; Ali, M.

Photon Factory Activity Report 1998, Part B, P. 67, 1999/11

no abstracts in English

Journal Articles

Double-electron excited singlet and triplet Be-like ions produced by slow He-like ion-atom collisions

Kitazawa, Shinichi; *; *; *; Machida, Shuichi*; *; Wakiya, K.*; *; F.Currel*; *; et al.

Atomic Collision Research in Japan, (24), p.70 - 72, 1998/00

no abstracts in English

Journal Articles

Electron spectra from singlet and triplet states of N$$^{3+}$$(1s$$^{2}$$3l3l',1s$$^{2}$$3l4l') produced by low energy N$$^{5+}$$+He, Ne and Ar collisions

Kitazawa, Shinichi; *; Machida, Shuichi*; Matsui, Y.*; Ida, H.*; *; Wakiya, K.*; *; F.Currell*; *; et al.

Journal of Physics B; Atomic, Molecular and Optical Physics, 31(14), p.3233 - 3243, 1998/00

 Times Cited Count:9 Percentile:48.21(Optics)

no abstracts in English

Journal Articles

Ejected electron spectra from doubly-excited states 1s$$^{2}$$nln'l' of C$$^{2+}$$ ions produced by collisions of C$$^{4+}$$ ions with alkaline-earth atoms

Machida, Shuichi*; *; *; Wakiya, K.*; *; *; *; Kitazawa, Shinichi; Sekiguchi, M.*

Atomic Collision Research in Japan;Progress Report, (23), p.36 - 37, 1997/00

no abstracts in English

Journal Articles

Studies of ejected-electron spectra arising from O$$^{6+}$$-He, Ne, Ar and N$$^{5+}$$-He, Ne, Ar, collisions

Kitazawa, Shinichi; *; *; *; *; Sekiguchi, M.*; *; Wakiya, K.*; Machida, Shuichi*

Phys. Scr., T73, p.207 - 208, 1997/00

 Times Cited Count:1 Percentile:19.53(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Electron spectra from doubly-excited states 1s$$^{2}$$nln´l´ of Be-like ions produced by collisions of O$$^{6+}$$ and C$$^{4+}$$ ions with alkali earth atoms

Machida, Shuichi*; *; *; Wakiya, K.*; *; *; *; *; Kitazawa, Shinichi; Sekiguchi, M.*; et al.

Atomic Collision Research in Japan,No. 22, 0, p.49 - 50, 1996/00

no abstracts in English

Journal Articles

Ejected-electron spectroscopy in highly charged ion collisions

Kitazawa, Shinichi; *; *; Sekiguchi, M.*

INS-J-182, 0, p.274 - 276, 1995/09

no abstracts in English

41 (Records 1-20 displayed on this page)