Kan Ashida^a, Kenji Ichimura^b, Kuniaki Watanabe<sup>b

a</sup>Radio-isotope Laboratory, Toyama University, Gofuku 3190, Toyama 930, Japan
^bTritium Research Center, Toyama University, Gofuku 3190, Toyama 930, Japan

Abstract

    Trapped states of deuterium implanted into a pyrolytic graphite with 5 keV were investigated by means of the x-ray photoelectron spectroscopy and the secondary ion mass spectrometry. Chemical shift and broadening of C1s peak were observed XPS spectra due deuterium-ion implantation at room temperature. The shift and the broadening increased with the deuterium fluence to reach constant values. In the SIMS spectra, CD^- and C₂D^- peaks appeared due to the deuterium implantation. The intensity of the CD^- peak increased with the fluence to reach a constant value, whereas that of the C₂D^- peak passed through a maximum to decrease to a constant value. A linear relation was observed between the chemical shift and the CD^- peak. The chemical shift and the CD^- peak disappeared after annealing at 600℃ for 5 min, whereas the broadening of the C1s peak and the C₂D^- peak disappeared after annealing the sample at 900℃ for 5 min. On the basis of these observations, it is concluded that at least two different species of the deuterium are formed in the graphite due to the deuterium implantation.
PACS numbers: 82.80. Ms, 79.60. - I, 82.80. Pv, 61.70. Tm

芦田 完, 市村憲司, 渡辺国昭

Masao Matsuyama, J.D. Redman

Hitoshi Miyake, Masao Matsuyama, Kan Ashida, Kuniaki Watanabe

Tritium Research Center, Toyama University, Gofuku 3190, Toyama 930, Japan

Abstract

    Permeation of three hydrogen isotopes, methane, and inert gases were measured for a tetrafluoroethylene(TFE) and a polyethylene(PE) film at room temperature by means of the time-lag method in order to establish physicochemical properties which determine the solubility and the diffusivity of these gases. It was observed that the diffusion constant of the inert gases changed exponentially with the heat of vaporization, and their solubility constant was an exponential function of the Lennard-Jones force constant of the gases for both films. On the other hand, hydrogen isotopes and methane deviated from these relations. It is concluded that the dispersive force plays an important role for the solution and the diffusion of the inert gases, whereas chemical interactions between the solute and the solvent play an important role.
PACS number: 51.20. + d

松山政夫, 三宅 均, 渡辺国昭

佐竹 洋