Orientation control of vanadylphthalocyanine (VOPc) thin films deposited on Au (111) substrate and Au substrate deposited on a microslide glass was studied with Vis/UV spectra, XRD profiles, XPS spectra and AFM images. Some of the VOPc molecules deposited on the Au substrate evaporated on the microslide glass epitaxially grow with the increase of substrate temperature during evaporating and it preheated before evaporating but others are inclined on the substrate. On the other hand, the VOPc thin film deposited on Au (111) substrate epitaxially grow with the increase of substrate temperature and it preheated. These are explained in terms of VOPc molecular diffusion on the substrate, the interaction between VOPc molecule and Au (111) substrate surface and the image force between the V-0 dipole and Au (111) substrate surface.
In the Large Helical Device, the control of particle recycling is one of important issues. Glow discharge cleanings (GDC) have been conducted to control the particle recycling in LHD. In order to simulate such the particle behavior, the glow discharge apparatus was fabricated, and retention and desorption of hydrogen and helium GDC gases were examined for stainless steel liner and graphite sample. The retained amount of hydrogen was one or two orders of magnitude larger than that of helium in both the wall materials. The helium ion impact desorption was observed to be effective to reduce the hydrogen retention. On the other hand, hydrogen ion impact was ineffective to reduce the helium retention. It was also seen that the impurities at the top surface of 316L SS was removed during GDC for only several hours.