Showing papers by "Shigero Ikeda published in 1987"
TL;DR: The adsorption states of benzonitrile and alkyl cyanides on evaporated nickel and palladium films have been studied by X-ray photoelectron spectroscopy as mentioned in this paper.
55 citations
TL;DR: In this paper, the structure of the cationic dimer of molybdenum (VI) species in acidic solution was investigated by the use of XANES and EXAFS.
Abstract: Structure of the cationic dimer of molybdenum(VI) species in acidic solution was investigated by the use of XANES and EXAFS. It was found that each Mo atom in the dimer has two terminal oxygens and Mo–O–Mo bond angle is ca. 125°.
20 citations
TL;DR: In this article, a pair of large peak currents were observed when potassium ion was used as the supporting cation in the reaction of the prussian blue (PB)/prussian white (PW) redox system, but when other alkali halides were used, such peaks could not be observed.
15 citations
TL;DR: In this paper, conditions for uniquely separating the true spectra of individual components from the overlapped Raman spectra were examined by factor analysis, and the unique separation is possible or not depending upon the information contained in the data set of the sample spectra.
Abstract: Conditions for uniquely separating the true spectra of individual components from the overlapped Raman spectra were examined by factor analysis. Whether the unique separation is possible or not depends upon the information contained in the data-set of the sample spectra. Unique solutions were obtained for two component Raman spectra under the following conditions. Case 1), two components each have a pure wavenumber and their pure samples exist; case 2), two components each have pure wavenumber; case 3), two pure samples exist; and case 4), one component has a pure wavenumber and its pure sample exists. Here, the pure wavenumber means the wavenumber at which only one component has a definite Raman intensity and the other components have zero intensities.
15 citations
TL;DR: In this paper, two distinct reaction rates were found in the formation of 12-molybdophosphate complex using laser Raman spectroscopy and they were analyzed by the use of laser-based spectrograms.
13 citations
TL;DR: In this article, the electrochemical behavior of molybdenum(VI) in sulphuric acid solutions was investigated by cyclic voltammetry, and the rate constant for the reaction was estimated to be 2.79×102 M−1 s−1 and activation energy was ca. 35 kJ mol−1 in 0.1 M H2O4.
6 citations
TL;DR: In this article, a simple Franck-Condon approach was used to predict the alkyl substitution effects on the ionization potentials and on the band widths of the first bands in UPS for alkylamines.
Abstract: Accurate measurements of UPS and ab initio potential energy calculations have been carried out for ammonia and several alkylamines to interpret the band shape of the UPS. Theoretical photoelectron band shape was obtained by a simple Franck–Condon approach. The calculation predicted very well the alkyl substitution effects on the ionization potentials and on the band widths of the first bands in UPS for the alkylamines. The following conclusions were obtained by comparing these theoretical photoelectron bands with experimental ones. The threshold ionization potential observed in the UPS is not always thermodynamically adiabatic ionization energy, but it can be subject to hot bands. Adiabatic ionization potential IPa of ammonia is concluded to be 10.08 eV. And the values of IPa for a series of alkylamines are evaluated by taking account of molecular vibrational frequency for the neutral state.
5 citations
TL;DR: In this article, the distortion from the regular octahedron around the Cr atom is similar to that for the copper sulphate pentahydrate, and the distortion of polyhedra in the Cr salt is considered to be due to the Jahn-Teller effect.
Abstract: CrS04 · 5 H 2 0 is triclinio: a = 6.1864(6), b = 10.9161(8), c = 6.0289(6) Α, α = 82.274°(6), β = 107.778°(8), y = 102.747°(8), V = 377.16(6) A, space group PI , Ζ = 2, Dx = 2.097 g · cm\" . The structure was refined to R = 0.034 by least-squares methods, using 4319 unique observed reflections. The distortion from the regular octahedron around Cr atom is similar to that for the copper sulphate pentahydrate, which contrasts with the regular octahedra around Mg atoms in magnesium sulphate pentahydrate isostructural with copper sulphate pentahydrate. The distortion of polyhedra in the Cr salt is considered to be due to the Jahn-Teller effect.
2 citations
TL;DR: In this article, two distinct reaction rates were found in the formation of 12-molybdophosphate complex using laser Raman spectroscopy and they were analyzed by the use of laser-based spectrograms.
Abstract: Two distinct reaction rates were found in the formation of 12-molybdophosphate complex. These differences in the formation processes were understood by the use of laser Raman spectroscopy. The reaction of isopolymolybdate (MoO4)2−(MoO3)11 with phosphate PO4⋯- proceeds slowly via formation of 11- molybdophosphate then to produce 12-molybdophosphate taken for 8 min. This reaction mechanism is considered to undergo first the replacement between MoO42− and PO43− then the transformation reaction from 11-molybdophosphate into 12-molybdophosphate. On the other hand, the acidification of the mixed solution of molybdate and phosphate rapidly produces 80% of 12-molybdophosphate within 30 s.
1 citations
TL;DR: In this paper, the electrochemical behavior of molybdenum(VI) in sulphuric acid solutions was investigated by cyclic voltammetry, and the rate constant for the reaction was estimated to be 2.79×102 M−1 s−1 and activation energy was ca. 35 kJ mol−1 in 0.1 M H2O4.
Abstract: The electrochemical behaviour of molybdenum(VI) in sulphuric acid solutions was investigated by cyclic voltammetry. In the reduction of Mo(VI) to Mo(III) a dimerization reaction of Mo(V) is involved; the rate constant for the reaction was estimated to be 2.79×102 M−1 s−1 and the activation energy was ca. 35 kJ mol−1 in 0.1 M H2O4. Oxidation of the monomer and dimer Mo(V) species take place at −0.31 and +0.18 V (vs. SCE), respectively.