All issues
Volume 32 (1984)
- Issue 5 Pages 365-
- Issue 4 Pages 319-
- Issue 3 Pages 277-
- Issue 2 Pages 221-
- Issue 1 Pages 3-
Volume 32, Issue 2
Displaying 1-5 of 5 articles from this issue
- |<
- <
- 1
- >
- >|
REGULAR PAPERS
-
Shoji Oishi, Kazunari Imagami1984 Volume 32 Issue 2 Pages 221-225
Published: 1984
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSThis paper discusses the analysis of particles of sintering furnance dusts using SIMS (Secondary ion mass spectrometry) techniques.
In-depth profile of elements of the single particle was corrected by total secondary ion monitoring method. As a result of this method high amounts of Ca, Al, Na, Si, K and Co were detected on the surface of a particle.
The results obtained by depth profile analysis revealed that elements in the particles are grouped into three clsses; 1) enriched at the surface 2) poor at the surface and enriched inside, 3) homogeneous from the surface to inside.
Quantitative analysis of particles was carried out by relative secondary ionization efficiency which was obtained using same matrix sample. Obtained values for such elements as Ca, Mg, Mn and V in the particles were most same as those of bulk concentrations.View full abstractDownload PDF (399K) -
Yutaka Takigami, Tadashi Nishijima, Toshio Koike, Kouichi Okuma1984 Volume 32 Issue 2 Pages 227-233
Published: 1984
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSA Quadrupole Mass Spectrometer (QMS) has commonly been used for qualitative analyses of gases in organic chemistry or for monitoring the vacuum conditions in industrial machines. No attempt has been made, however, to apply it to geochronological studies because of its disadvantages such as the difficulty in obtaining precise isotope ratios due to triangular peak shapes and poor reproducibility. On the other hand, there are advantages that a QMS is relatively inexpensive and gives a shorter scanning time for analysis compared with a sector type mass spectrometer. The latter characteristics is useful for 40Ar/39Ar geochronological studies, since it gives a lower background in the QMS and the possibility to obtain many more data from one sample in a limited time.
In this study, we have tried to improve a commercial QMS at many parts, such as rf-generator, quadrupole, ionization chamber, source magnet, and so on, in order to meet the requirements to use it for geochronological studies. With the use of the improved QMS equipped with an on-line microcomputer, we could obtain Ar isotope data which are sufficiently precise for the 40Ar/39Ar geochronological studies.View full abstractDownload PDF (470K) -
Application of Respiratory Mass Spectrometer and Computer SystemIsao Nishi1984 Volume 32 Issue 2 Pages 235-252
Published: 1984
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSAn improved mass spectrometer-computer system has been developed for a simultaneous measurement of multi-variables and multi-dimensional analysis of the respiration, circulation and metabolism functions.
The system is composed of a respiratory mass spectrometer, a pneumotachometer, a heart rate meter, a microcomputer system which is combined with a specially designed analogue processor. A bicycle ergometer and a treadmill are used for exercise test. Measurable factors are instantaneous change of respiratory gas concentrations, breathing flow, heart rate, ventilation rate VE, oxygen uptake rate VO2, carbon dioxide output rate VCO2, cardiac output Qe, all kinds of lung volumes and thier derivatives. VE, VO2, VCO2 are calculated in breath by breath with an improved precision by means of real time processing of gas concentrations and breathing flow. Qc and its derivatives can be intermittently measured by means of C2H2 rebreathing method. With employing the present system, almost all kinds of respiration factors can be simultaneously measured together with circulation and metabolism factors, and especially the analysis of transient response to the applied exercise became accessible. Thus the more advanced measurement was attained for the study of respiration physiology and for the clinical applications.View full abstractDownload PDF (1082K) -
Shingo Matsuoka, Hirone Nakamura, Toshihiro Fujii, Takaaki Tamura1984 Volume 32 Issue 2 Pages 253-262
Published: 1984
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSA flowing afterglow apparatus was constructed and the operation of the afterglow system including data analysis was tested by measuring the rate constants for the reactions N+ + NO, N2+ + NO, He+ + N2, and SF6 + e; the results were 5.8 × 10-10, 3.9 × 10-10, 1.20 × 10-9, and 2.1 × 10-7 cm3s-1 respectively. In the measurements an extraction voltage for ion sampling was not applied to the nose cone in order not to introduce an electric field into the reaction region. A "non-ambipolar" model developed by us was used for the data analysis of the ion/molecule reactions. For the data analysis of the electron attachment, a typical curve fit mehtod to the product ion signal was used. However, no theoretical curves fit the experimental points. This disagreement is attributed to a change of the ion-sampling efficiency through the nose-cone aperture arising from a change of the electron-dominated plasma to a negative-ion-dominated plasma with an increasing flow rate of SF6. Nevertheless, the attachment rate could be determined by fitting the theoretical and experimental curves in the limited region of the SF6 flow rate where the negative-ion-dominated plasma is established at the sampling aperture. All the rate constants obtained here agree reasonably well with literature values. Next, errors in the positive ion/molecule reaction rate constants, which would occur if the diffusion coefficients of the ions and neutrals each have a +10% error were calculated for the flow model to be -0.4 and +1.2 % respectively, demonstrating that these parameters are not important in the analysis of data. This insensitivity explains why the nose-cone voltage applied in a typical flowing afterglow operation has not caused a significant error in the published rate constants although it disturbs the ion diffusive behavior.View full abstractDownload PDF (631K)
NOTE
-
Hirofumi Kuwabara, Masahiko Tsuchiya1984 Volume 32 Issue 2 Pages 263-266
Published: 1984
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSNickel halide complexes containing ethylenediamines as ligands were examined by liquid ionization mass spectrometry. Protonated molecules obtained as the base peaks and their isotope ratios agreed with their natural abundances. The mass spectra corresponding well to the structure of the complexes were better than their FD and FAB spectra.View full abstractDownload PDF (234K)
- |<
- <
- 1
- >
- >|