オリジナル論文

1. Y. Ohmasa and A. Chiba
   Diffuse + Bragg double scattering and specular reflection observed in the small-angle X-ray scattering from highly oriented pyrolytic graphite
   J. Appl. Cryst., 52, 652-664 (2019). DOI:https://doi.org/10.1107/S1600576719005648.


2. Y. Ohmasa and A. Chiba
   Intensity distribution profile of double Bragg scattering in the small angle region from highly oriented pyrolytic graphite
   Acta Cryst., A74,681-698 (2018).


3. Y. Ohmasa, S. Shimomura, A. Chiba
   Double Bragg scattering observed in small-angle X-ray scattering from highly oriented pyrolytic graphite
   J. Appl. Crystallogr., 49, 835-844 (2016).


4. S. Hosokawa, S. Munejiri, M. Inui, Y. Kajihara, W-C Pilgrim, Y. Ohmasa, S. Tsutsui, A. Q. R. Baron, F. Shimojo and K. Hoshino
   Transverse excitations in liquid Sn
   J. Phys.: Condens. Matter, 25, 112101 (2013).


5. Y. Ohmasa and M. Yao
   Surface Waves on non-Newtonian viscoelastic Liquids
   Phys. Rev. E, 83,031605 (2011).


6. K. Nagaya, H. Iwayama, A. Sugishima, Y. Ohmasa and M. Yao
   Contactless measurements of charge migration within single molecules
   Appl. Phys. Lett., 96, 233101 (2010).


7. H. Iwayama, K. Nagaya, H. Murakami, Y. Ohmasa, and M. Yao
   Coulomb explosion imaging of bromobenzene and bromophenol molecules following Br K-shell ionization
   J. Phys. B: At. Mol. Opt. Phys., 43, 185207 (2010).


8. R. Osada, T. Hoshino, K. Okada, Y. Ohmasa and M. Yao
   Surface tension of room temperature ionic liquids measured by dynamic light scattering
   J. Chem. Phys., 130, 184705 1-8 (2009).


9. Y. Ohmasa, T. Hoshino, R. Osada, and M. Yao
   Bulk shear-mode contribution to thermally generated capillary waves on a room-temperature ionic-liquid surface
   Phys. Rev. E, 79, 061601 1-11 (2009).


10. Y. Ohmasa, K. Fujii, T. Hoshino and M. Yao
    Meso-scale fluctuations in liquid chalcogens near the metal-nonmetal transition
    J. Phys.: Conf. Ser., 98, 012009 1-4 (2008).


11. Y. Ohmasa, S. Takahashi, K. Fujii and M. Yao
    Critical point dewetting: competition between the gravity and the dispersion force
    J. Phys.: Conf. Ser., 98, 062026 1-5 (2008).


12. Y. Ohmasa, T. Hoshino, R. Osada, M. Yao
    Surface waves at the liquid-vapor interface of ionic liquid [bmim][TFSI]
    Chem. Phys. Lett., 455, 184-188 (2008).


13. A. Chiba, Y. Ohmasa, S. M. Bennington, J. W. Taylor, and M. Yao
    Analysis of the optic-type collective mode in liquid selenium to determine the local structure
    Phys. Rev. B, 77, 132202 1-4 (2008).


14. K. Fujii, Y. Ohmasa, S. Takahashi, T. Katayama, W. Makino, and M. Yao
    Ellipsometric Spectroscopy of Liquid Selenium-Thallium Mixtures
    J. Phys. Soc. Jpn., 77, 044708 1-6 (2008).


15. M. Yao and Y. Ohmasa
    Study of Liquid Metals as a Basis for Nanoscience
    J. Phys.: Condens. Matter , 20, 114101-1 - 114101-6 (2008).


16. T. Hoshino, Y. Ohmasa, R. Osada, and M. Yao
    Dispersion relation of capillary waves on ionic liquids: Observation of the fast overdamped mode
    Phys. Rev. E, 78, 061604 1-8 (2008).


17. Y. Ohmasa, T. Hoshino, H. Kajikawa, K. Kobayashi, M. Iwakoshi and M.Yao
    Dynamics of a mercury prewetting film near the prewetting critical point
    J. Non-Cryst. Solids 353, 3570-3575 (2007).


18. Y. Ohmasa, Y. Nishikawa and M. Yao
    Equilibrium and Non-Equilibrium Wetting Phenomena of Liquid Se-Tl System on Quartz Substrate
    J. Non-Cryst. Solids 353, 3576-3581 (2007).


19. H. Iwayama, K. Nagaya, H. Murakami, Y. Ohmasa and M. Yao
    Coulomb explosion of K-shell ionized krypton clusters studied by multiple-ion coincidence momentum imaging
    J. Chem. Phys., 126, 024305 (2007).


20. H. Murakami, K. Nagaya, Y. Ohmasa, H. Iwayama, and M. Yao
    Electron-ion-coincidence spectra of K-shell excited Ne, Ar, and Kr clusters
    J. Chem. Phys., 126, 054306 (2007).


21. H. Murakamia, H. Iwayama, K. Nagaya, Y. Ohmasa, and M. Yao
    Electron-ion-coincidence spectra for deep inner-shell excited rare-gas clusters
    Eur. Phys. J. D, 43, 73-76 (2007).


22. K. Nagaya, H.Iwayama, H. Murakami,Y. Ohmasa, M. Yao
    EICO Measurements of Inner-Core Excited Mixed Rare-Gas Clusters:Direct Observation of Charge Transfer
    Eur. Phys. J. D, 43, 69-72 (2007).


23. Y. Ohmasa, S. Takahashi, K. Fujii, Y. Nishikawa and M. Yao
    Critical point dewetting observed in the liquid Se-Tl system on a quartz substrate
    J. Phys.: Condens. Matter, 18, 8449 (2006).


24. Y. Ohmasa, S. Takahashi, K. Fujii, Y. Nishikawa and M. Yao
    Transient Wetting of Liquid Selenium-Thallium Mixtures on a Silica Substrate
    J. Phys. Soc. Jpn 75, 084605 (2006).


25. K. Nagaya, M. Yao, H. Murakami, A. Mori, Y. Ohmasa, H. Kajikawa
    Electron-Ion-Coincidence Measurements for K-Shell Excited Free Krypton Clusters
    J. Phys. Soc. Jpn., 75, 114801 (2006).


26. Y. Kawakita, A. Chiba, Y. Yokota, M. Yao, K. Shibata, Y. Ohmasa and S. Takeda
    Inter- and intra-molecular dynamics in liquid Se2Br2
    Physica B: Cond. Matter, 385-386, Part 1, 15 256-258(2006).


27. A. Chiba, M. Yao, Y. Ohmasa, Y. Hiejima, Y. Kawakita and S.M. Bennington
    Dynamic Structure of Liquid Chalcogens in the Semiconductor-to-Metal Transition Range
    J. Neutron Research, 13, 149-152 (2005).


28. K. Nagaya, A. Mori, H. Murakami, M. Yao, Y. Ohmasa, H. Kajikawa, K. Kobayashi, Y. Kajihara, A. Chiba, Y. Nishikawa, M. Ishii, Y. Fujii and E. Hayata
    X-ray absorption and de-excitation processes of krypton clusters studied by the XAFS-PEPICO synchronous measurements
    Phys. Scr., T115, 984-985 (2005).


29. A. Chiba, Y. Ohmasa, M. Yao and S.M. Bennington
    Optic-type Vibrational Modes of Liquid Chalcogens
    J. Neutron Research, 12, 301-304 (2004).


30. Y. Kajihara, Y. Ohmasa and M. Yao
    Optical emissivity study of the critical fluctuations in mercury wetting film on sapphire
    J. Phys.: Cond. Matter, 15, 6179-6198 (2003).


31. A. Chiba, Y. Ohmasa and M. Yao
    Vibrational, single-particle-like and diffusive dynamics in liquid Se, Te and Te50Se50
    J. Chem. Phys., 119, 9047-9062 (2003).


32. A. Chiba, Y. Ohmasa, M. Yao, O. Petrenko, and Y. Kawakita
    Quasielastic Neutron Scattering of Liquid Te_50 Se_50 in the Semiconductor-to-Metal Transition Range
    J. Phys. Soc. Jpn., 71, 504-508 (2002).


33. Y. Ohmasa, Y. Kajihara and M. Yao,
    Two-dimensional supercritical fluid mercury formed on a sapphire substrate
    J. Non-Cryst. Solids, 312-314, 472-480 (2002).


34. Y. Kajihara, Y. Ohmasa, H. Kohno, Y. Hiejima and M. Yao
    Critical fluctuations in mercury wetting film on sapphire
    J. Non-Cryst. Solids, 312-314, 489-493 (2002).


35. A. Chiba, Y. Ohmasa, Y. Kawakita, M. Yao and H. Endo
    Neutron scattering studies of liquid tellurium-selenium mixtures
    J. Non-cryst. Solids, 312-314, 384-387 (2002).


36. K. Nagaya, M. Yao, T. Hayakawa, Y. Ohmasa, Y. Kajihara, M. Ishii and Y. Katayama
    Size-Selective Extendend X-ray Absorption Fine Structure Spectroscopy of Free Selenium Clusters
    Phys. Rev. Lett., 89, 243401 1-4 (2002).


37. Y. Ohmasa, Y. Kajihara and M. Yao
    Mercury wetting film on sapphire
    Phys. Rev. E, 63, 051601-1-14(2001).


38. M. Yao and Y. Ohmasa
    Wetting phenomena for mercury on sapphire
    J. Phys.: Cond. Matter , 13, R297-R319 (2001).


39. M. Yao, T. Hayakawa, K. Nagaya, K. Hamada, Y. Ohmasa and M. Nomura
    A New Method for the Size-Selective EXFAS of Neutral Free Clusters
    J. Synchrot. Radiat., 8, 542-544 (2001).


40. A. Chiba, Y. Kawakita, Y. Ohmasa, Y. Hiejima and M. Yao
    Neutron Inelastic Scattering Measurements of Liquid Se2X2 (X: halogen)
    Anal. Sci.suppl., 17, pp.i1089-i1092 (2001).


41. Y. Ohmasa, Y. Kajihara, H. Kohno, Y. Hiejima and M. Yao
    Wetting Phenomena of Mercury on Sapphire Studied by Optical Emissivity Measurement
    J. Phys.: Cond. Matter, 12, A375-A381 (2000).


42. T. Hayakawa, K. Nagaya, I. Yamamoto, Y. Ohmasa, M. Yao and M. Nomura
    Photoelectron Photoion Coincidence Measurements of Selenium Cluster Beam. I. Evidence for the Coulomb Expansion
    J. Phys. Soc. Jpn, 69, 2039-2048 (2000).


43. T. Hayakawa, K. Nagaya, K. Hamada, Y. Ohmasa and M. Yao
    Photoelectron Photoion Coincidence Measurements of Selenium Cluster Beam. II. Photon Energy Dependence
    J. Phys. Soc. Jpn., 69, 2850-2858 (2000).


44. Y. Ohmasa, Y. Kajihara, H. Kohno, Y. Hiejima and M. Yao
    Wetting Phenomena at Mercury-Sapphire Interface under High Temperature and Pressure
    J. Non-Cryst. Solids, 250-252, 209-213 (1999).


45. I.Yamamoto, Y.Ohmasa, H.Endo
    Optical properties of selenium under high pressure
    J. Non-Cryst. Solids, 250-252, 423-427 (1999).


46. M.Yao, T.Hayakawa, K.Nagaya, Y.Ohmasa, K.Hamada, M.Tai, I.Yamamoto and M.Nomura
    X-ray Absorption Near Edge Structure of Selenium Free Clusters
    Jpn. J. Appl. Phys., 38, Suppl. 38-1, 564-567 (1999).


47. Y.Ohmasa, M. Yao and H.Endo
    Pressure-Induced Phase Transitions in Te-Se system
    Rev. High Pressure Sci. Technol., 7, 248-250 (1998).


48. Y. Ohmasa, Y. Kajihara and M. Yao
    Ellipsometric Study of the Prewetting Transition at Mercury-Sapphire Interface
    J. Phys.: Cond. Matter, 10, 11589-11594 (1998).


49. Y. Ohmasa, M. Yao and H. Endo
    ESR study of pressure-quenched monoclinic Te0.4Se0.6
    J.Phys.Soc.Jpn., 66, 684-689 (1997).


50. Y.Ohmasa, I.Yamamoto and H.Endo
    Pressure-induced semiconductor-metal transition in Te-Se mixtures
    J. Non-Cryst. Solids., 205-207, 57-61 (1996).


51. Y.Ohmasa, I.Yamamoto, M.Yao and H.Endo
    Structure and Electronic Properties of Te-Se Mixtures under High Pressure
    J.Phys.Soc.Jpn. , 64, 4766-4789 (1995).


52. I.Yamamoto, Y.Ohmasa, H.Ikeda and H.Endo
    The optical properties of tellurium under high pressure
    J. Phys.: Cond. Matter , 7, 4299-4312 (1995).


53. M.Yao, Y.Kawakita, K.Nagaya, Y.Ohmasa, T.Tsuzuki, M.Inui and H.Endo
    EXAFS study of the liquid-glass transition in binary nitrate systems
    J. Non-Cryst. Solids. , 156-158, 555 (1993).


54. T.Tsuzuki, A.Sano, Y.Kawakita, Y.Ohmasa, M.Yao, H.Endo, M.Inui and M.Misawa
    Structure of chalcogen nano-droplets
    J. Non-Cryst. Solids. , 156-158, 695 (1993).


55. Y.Kawakita, J.Dong, T.Tsuzuki, Y.Ohmasa, M.Yao, H.Endo, H.Hosino and M.Inui
    Modification of the chain structure of chalcogen by adding halogens and alkalis
    J. Non-Cryst. Solids. , 156-158, 757 (1993).

紀要

1. 井上光、尾崎徹、鈴木貴、中西助次、細川伸也、大政義典
   HIT基礎物理学シリーズ　2．工科系のための基礎力学
   広島工業大学紀要　教育編　第１２巻、2013, p.29-3


2. 鈴木貴、尾崎徹、井上光、大政義典、細川伸也、北野保行
   接続型教育を目指して　第３報　基礎物理演習の教育効果
   広島工業大学紀要　教育編　第９巻、2010, p.19-25


3. 尾崎徹、鈴木貴、大政義典、北野保行、細川伸也
   接続型教育を目指して　第４報　基礎物理科目から専門科目への接続の調査と改善
   広島工業大学紀要　教育編　第９巻、2010, p.27-36

総説・解説

1. 大政義典・梶原行夫・八尾誠
   水銀／サファイア界面での濡れ現象
   固体物理, 36, 543-552 (2001).

著書

1. 大政義典、淺川誠、藤井和成
   「工学系の基礎物理学実験」
   学術図書出版社 (2018)


2. 中西助次、井上光、尾崎徹、細川伸也、大政義典、小島健一
   「工科系のための物理学実験　第３版」　
   東京教学社 (2011)


3. 井上光、鈴木貴、尾崎徹、中西助次、細川伸也、大政義典
   「工科系のための基礎力学　第２版」　
   東京教学社 (2010)

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経歴

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