Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Informa UK Limited  

A novel retarding type electron energy analyzer implementing an electrostatic lens system to achieve a high energy resolution sufficient to measure thermodynamic temperature has been investigated based on the electron trajectory analysis. The energy resolution of the analyzer depends linearly on the retarding energy with a modulus of 0.05 %. The voltages to be applied to the electrodes in the analyzer are found to be controllable linearly against the retarding voltage. The analyzer has threshold energies, whose effect can be excluded in practical measurements.

DOI： 10.9746/jcmsi.6.238

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

In this paper we performed ultraviolet photoelectron spectroscopy (UPS) measurements to obtain sample temperatures of a single crystal surface of Cu(110) in temperatures ranging from 10 K to 300 K. The Fermi-Dirac distribution function was applied to the high energy spectral edge of the photoelectron distribution. The data was then adapted to a Gaussian distribution which represents the instrumental resolution. The difference between measured and adapted temperatures expands at the higher temperature range. The present experiment results were consistent with the previous theoretical work on energy resolution and sensitivity of photoelectron measurements for determination of thermodynamic temperature.

DOI： 10.1063/1.4819666

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER/PLENUM PUBLISHERS  

Photoelectron spectroscopy as a practical method for measuring thermodynamic temperature is investigated. The present analysis is based on the sensitivity of the Fermi-Dirac distribution function to temperature variation, and the effect of energy resolution of the photoelectron measurements on the resulting temperature determination. A newly designed electron energy analyzer implementing an einzel lens system is presented. From simulations of electron trajectories, the energy resolution of the analyzer was estimated to be 2 meV which is sufficient to achieve an accuracy better than 1 K for the temperature range from 25 K to 300 K.

DOI： 10.1007/s10765-011-1027-6

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER INST PHYSICS  

Transmission electron microscopy (TEM) technique was used to investigate the structure of carbon nanowalls (CNWs). The TEM observation clearly indicated the existence of the bended graphene structure in boundary regions between the crystallites of CNWs. According to this TEM result, the first-principles calculation was employed for the bended coronene molecule as the model of the boundary region between the crystallites of CNWs, to elucidate the mechanism of the hydrogen adsorption to CNWs. The hydrogen adsorption energies onto both on-top and hollow sites become greater as the bending angle increases, because the electronic structure of the carbon atom at the adsorption site changes from sp(2) to sp(3) hybridization character by natural bond orbital analysis. Our computational result is reasonably consistent with the specific feature of hydrogen adsorption to CNWs, which had been reported in our previous work by ultraviolet photoelectron spectroscopy and temperature program desorption measurements by Kinoshita et al.[Chem. Phys. Lett. 450, 360 (2008)]. (C) 2010 American Institute of Physics. [doi:10.1063/1.3446830]

DOI： 10.1063/1.3446830

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Electronic structure of carbon nanowalls (CNW) was measured by ultraviolet photoelectron spectroscopy (UPS) in comparison with highly oriented pyrolitic graphite (HOPG). While the interlayer band of CNWs was observed at same energy of that in HOPG, the a and pi bands were observed as are in carbon nanotubes. Electronic effects by deuterium adsorption were investigated by combination of UPS and temperature programmed desorption (TPD) measurements. Deuterium adsorption preferably occurred in the boundary regions between crystallites in CNWs and enhanced the density of states associated with them. (c) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.cplett.2007.11.038

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Language：English   Presentation type：Poster presentation  

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Language：English   Presentation type：Poster presentation  

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