+"Photo-enhanced band-edge luminescence in ZnO nanocrystals dispersed in ethanol"~ Sekika Yamamoto~ J. Phys. Chem. C (accepted) +"Observation of Dark Exciton Luminescence from ZnO Nanocrystals in Quantum Confinement Regime"~ Sekika Yamamoto and Tomobumi Mishina,~ Phys. Rev. B 83, 165435 (2011). +"Enhanced band-edge photoluminescence from MgO passivated ZnO nanocrystals"~ Sekika Yamamoto and Tomobumi Mishina,~ J. Luminescence 131, 620 (2011). +"Exciton luminescence dynamics in ZnO crystal observed under one and two-photon excitation"~ Sekika Yamamoto, Hikari Sakuma and Tomobumi Mishina,~ Jpn. J. Appl. Phys. 49, 121102 (2010). +"Phonon screening in photochemically doped zinc oxide nanocrystals"~ Sekika Yamamoto, Tomobumi Mishina,~ J. Appl. Phys. 103 (2008) 74305. +"Decay Dynamics of Ultraviolet Photoluminescence in ZnO Nanocrystals"~ Sekika Yamamoto, Hiroyuki Yano, Tomobumi Mishina, Jun'ichiro Nakahara,~ J. Luminescence 126 (2007) 257-262. +"Pressure dependence of local structure in liquid carbon disulfide"~ Sekika Yamamoto, Yasuhiko Ishibashi, Yasuhiro Inamura, Yoshinori Katayama, Tomobumi Mishina, Jun'ichiro Nakahara,~ J. Chem. Phys. 124(2006)144511. +"Femtosecond pump-probe studies of phonons and carriers in bismuth under high pressure"~ M. Kasami, T. Ogino, T. Mishina, S. Yamamoto, J. Nakahara,~ J. Luminescence 119-120, 428-432 (2006). +"Coherent longitudinal acoustic phonons in pyrite"~ M.Kasami, T.Mishina, S.Yamamoto, J.Nakahara~ J.Luminescence 108 (2004) 291-295 +"OPTICAL KERR EFFECT IN CARBON DISULFIDE UNDER HIGH PRESSURE"~ A.Ishizumi, M.Kasami, T.Mishina, S.Yamamoto and J. Nakahara~ High Pressure Research vol.23 No.3 201-204 (2003) +"Dynamical and Structural Properties of Liquid Carbon Disulfide under High Pressure"~ S.Yamamoto, T.Mishina, and J.Nakahara~ Proceedings of The 3rd International Symposium on New Trends of Physics, Hokkaido University, November 11-12, 2003 +"Broad Raman scattering and luminescence in beta-carotene solution"~ R.Nakamura, S.Yamamoto, and J.Nakahara~ Journal of Chemical Physics 117 (2002) 238-247 +"Pressure dependence of low-frequency light scattering in carbon disulfide"~ A.Ishizumi, S.Yamamoto, J.Nakahara~ Journal of Luminescence 94-95 (2001) 687-690 +"Pressure Dependence of the Birefringence in AgGaS$_2$"~ M. Nakanishi, S.Yamamoto, T.Matsuhashi, D.Goshima, and J.Nakahara~ phys. stat. sol (b) 223 (2001) 325 +"Photoluminescence spectra of CuAlS$_2$ doped with Er"~ J.Nakahara, K.Itoh, K.Sato, S.Yamamoto~ J.Luminescece 87-89 (2000) 1112-1114 +"Energy Transfer between Mn Ions in Semimagnetic Semiconductors"~ S. Yamamoto, K. Takamura, J. Nakahara~ phys. stat. sol. (b) 211 (1999) 111-116 +"Decay Process of Photoluminescence in CdMnTe"~ J.Nakahara, K.Takamura, and S.Yamamoto~ phys.stat.sol.(b) 211 (1999) 223 +"Pressure Dependence of Photoluminescence Spectra in CuAlS$_2$ Doped with Lanthanide"~ K. Itoh, S. Yamamoto, K. Sato and J. Nakahara~ Rev. High Pressure Sci. Technol. 7 (1998) 769-771 +"Polarized Photoluminescence with Long Lifetime in AgGaS$_2$"~ J.Nakahara, Y.Narita, K.Itoh, E.Niwa, K.Masumoto and S.Yamamoto~ phys.stat.sol (b) 210 (1998) 479 +"Excitation Spectra in CdMnTe"~ K.Takamura, S.Yamamoto, J.Watanabe, and J.Nakahara~ Proc. 11th Int. Conf. Ternary and Multinary Compounds.~ Inst. Phys. Conf. Ser. 152 (1998) 453-456 +"Optical Properties in zing-blende MnTeSb films"~ K.Takamura, S.Miyanishi, S.Yamamoto, H.Akinaga and J.Nakahara~ Proc. 11th Int. Conf. Ternary and Multinary Compounds.~ Inst. Phys. Conf. Ser. 152 (1998) 613-616 +"Decay profiles of Mn photoluminescence in CdMnTe"~ S.Yamamoto, J.D.Park and J.Nakahara~ Proc. 11th Int. Conf. Ternary and Multinary Compounds.~ Inst. Phys. Conf. Ser. 152 (1998) 457-460~ +"Electron Scattering by Mn Impurities in Si Detected by Cyclotron Resonance Measurement"~ Sekika Yamamoto, and Tyuzi Ohyama~ Jpn.J.Appl.Phys. 36 (1997) 1112-1118 +"Decay Profiles of Mn2+ Photoluminescence in CdMnTe"~ Jae Dong Park, Sekika Yamamoto, Junji Watanabe, Koji Takamura, and Jun'ichiro nakahara~ J.Phys.Soc.Jpn. 66 (1997) 3289-3293 +"Mn Concentration Dependence of Excitation Spectrum of Infrared Photo-luminescence in CdMnTe"~ K.Takamura, S.Yamamoto, J.Watanabe and J.Nakahara~ The 2nd Symposium on the Physics and Application of Spin-Related Phenomena in Semiconductors (1997) 19-22 +"Decay Profiles of Mn$^{2+}$ Photoluminescence in CdMnTe"~ J.D.Park, K.Takamura, S.Yamamoto, J.Watanabe and J.Nakahara~ The 2nd Symposium on the Physics and Application of Spin-Related Phenomena in Semiconductors (1997) 15-18 +"Temperature Dependence of Mn$^{2+}$ Optical Transition in Mn Based Semimagnetic Semiconductors"~ K.Takamura, S.Yamamoto, S.Miyanishi, H.Akinaga and J.Nakahara~ Proc. 3nd Symposium on the Physics and Application of Spin-Related Phenomena in Semiconductors (1997) 144-147 +"Pressure Dependence of Photoluminescence Spectra in CuAlS$_2$ Doped with Lanthanide"~ K. Itoh, S. Yamamoto, K. Sato and J. Nakahara~ Proc. Int. Conf. on High Pressure Sci. Tech.(AIRPT16) (1997) 769-771 +"Excitation Spectrum of infrared photoluminescence in CdMnTe"~ K. Takamura, J. D. Park, S. Yamamoto and J. Nakahara~ Transaction of the Materials Research Society of Japan Vol.20 (1996) 762-765 +"Electron Scattering by Transition Metal Impurities in Silicon"~ Sekika Yamamoto, Tyuzi Ohyama~ Proceedings of 23rd Intl. Conf. Phys. Semicond. 4 (1996) 2721-2724 +"Decay Process of CdMnTe with Variation of Excitation Power"~ J.D.Park, K.Takamura, S.Yamamoto, J.Watanabe and J.Nakahara~ Symposium on the Physics and Application of Spin-Related Phenomena in Semiconduc tors (1995) 87-88 +"Electron Scattering by Magnetic Impurity in Semiconductor"~ S.Yamamoto, T.Ohyama and J.Nakahara~ Symposium on the Physics and Application of Spin-Related Phenomena in Semiconductors (1995) 97-100 +"Influence of Interface Barrier on Lateral Transport Properties for Metal/Semiconductor Systems"~ Sekika Yamamoto, Tyuzi Ohyama, Eizo Otsuka, Syouichi Yamauchi, and Motohiro Iwami~ Jpn. J. Appl. Phys. 33 (1994) 3971-3978 +"Construction of a Soft X-Ray Emission Spectroscopy(SXES) Apparatus and Its Application for Study of Electronic and Atomic Structures of a Multilayer System."~ Motohiro Iwami, Masaaki Hirai, Masahiko Kusaka, Mosaru Kubota, Sekika Yamamoto,~ Hatsuo Nakamura, Hirokuni Watanabe, Masao Kawai, and Hiroyoshi Soezima~ Jpn. J. Appl. Phys. 29 (1990) 1353-1356