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Volume 22, Issue 9
Displaying 1-4 of 4 articles from this issue
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Akira TONOMURA, Tsuyoshi MATSUDA, Junji ENDO1979 Volume 22 Issue 9 Pages 287-295
Published: September 20, 1979
Released on J-STAGE: September 04, 2009
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Masao WATANABE, Tara ITO1979 Volume 22 Issue 9 Pages 296-305
Published: September 20, 1979
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSEffects of adsorbed hydrogen on ESR at g =1.961 appeared from ZnO of a powdered form were studied in company with NMR measurements of protons for adsorbed hydrogen and hydroxyl groups remaining on the surface. The existence of an accumulation layer on the surface of ZnO was confirmed. The ESR at g = 1.961 was concluded to be originated from degenerated conduction electrons in the accumulation layer. Chemisorbed hydrogen decreases the relaxation of spins of the conduction electrons at the surface. Observed NMR spectra reveal that a part of chemisorbed hydrogen is in a state similar to hydroxyls and the other is in a state with free motions on the surface. A molecular form hydrogen adsorbed with hydroxyls on the surface is found, which is assumed to be H3+or O-H3+ and adsorbed with an ionic potential of ZnO. Its NMR line shifts by about 15 ppm from the position of protons in water to low field direction.View full abstractDownload PDF (1315K) -
Yutaka HAGIHARA1979 Volume 22 Issue 9 Pages 306-310
Published: September 20, 1979
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSExperiments on vacuum evaporation were made in falling-film colum in a range of residual air pressure from 1 × 10-4 to 3.5 × 10-1. Torr by use of di-butyl-sebacate (D.B.S.). In this work, slip-diffusion model which consists of two zones was applied to analysis of mass transfer in the evaporating space. The following results were obtained : The mechanisms of mass transfer in the evaporating space were divided by the value of Pr/Pvs.At the value of Pr/Pvs above 1.4, mass transfer in the evaporating space is controled by moecular diffusion, and then the effect of molecular-burst-evaporation on mass transfer velocity is neglected. At the value of Pr/Pvsbelow 0.3, mass transfer in evaporating space is controled by molecular-burst-evaporation, and then the effect of molecular diffusion on mass transfer velocity is neglected. At a range of Pr/Pvsfrom 0.3 to 1.4, mass transfer in evaporating space is controled by two mechanisms (molecular diffusion and molecular-burst-evaporation).
The relationship of D.B.S. between the value of Pr/Pvs and the mechanisms of mass transfer in the evaporating space described above agrees with those of di-butyl-phthalate and di-2-ethyl hexyl-phthalate. Consequently, it is considered that 0.3 and 1.4 of Pr/Pvs are the universal values.View full abstractDownload PDF (556K) -
Ryosuke KONISHI, Yasushi KAWAMOTO, Susumu KATO1979 Volume 22 Issue 9 Pages 311-317
Published: September 20, 1979
Released on J-STAGE: September 04, 2009
JOURNAL FREE ACCESSAuger electron appearance potential spectroscopy (AEAPS), which is one of the core level spectroscopies, measures the appearance potential of Auger electrons emitted by core level excitations. In the present paper, AEAPS apparatus consisted of a simple electrode is shown. Spectra of graphite, stainless steel 304 and titanium are shown as examples. AEAPS is found to be more sensitive than soft-X-ray appearance potential spectroscopy (SXAPS). Both spectra contain nearly the same information about the solid surfaces.View full abstractDownload PDF (621K)
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