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Volume 29 (1981)
- Issue 4 Pages 345-
- Issue 3 Pages 221-
- Issue 2 Pages 161-
- Issue 1 Pages 51-
Volume 29, Issue 2
Displaying 1-5 of 5 articles from this issue
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ORIGINAL PAPERS
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Hisashi Matsuda1981 Volume 29 Issue 2 Pages 161-166
Published: 1981
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSImage aberrations of various different magnetic sector type mass spectrometers are calculated and compared. Four second order aberration coefficients Aαα, Ayy, Ayβ and Aββ are important. The third order aberration coefficients are sufficiently small. The old proposals for Aαα = 0 yield very large aberrations for Ayy, Ayβ and Aββ due to the influence of fringing field. The image aberrations of 90° and 60° sector type with symmetric arrangement are rather small. Several ion optical systems for a better single focusing mass spectrometer are proposed (for instance, φm = 130°, ε1 = ε2 = 55°, Aγ/γm = 3).View full abstractDownload PDF (371K) -
Mitsuru Asano, Toshio Harada, Kenji Kubo1981 Volume 29 Issue 2 Pages 167-172
Published: 1981
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSA comparison of energy distribution curves of Sr+ thermal ions emitted from SrO-W surface with the result of mass spectrometric thermal analysis of SrO-W system has been made. The distribution curves have been obtained by the technique of electrical differentiation of the retarding voltage curves in a method similar to Auger electron spectroscopy with a four-grid low energy electron diffraction optics. The distribution curves obtained at various temperatures in the range 1570 - 1919 K are almost Maxwellian, except for 1842 K where the curve is very broad. The result at 1842 K is probably due to the emission of Sr+ thermal ions from various work function surfaces. From the values of retarding voltages at maximum of energy distribution curves, work functions of surfaces, from where Sr+ thermal ions are emitted, are measured. The values of work functions are widely varied with the chemical forms of strontium on tungsten.View full abstractDownload PDF (349K) -
Mitsuru Asano, Toshio Harada, Kenji Kubo1981 Volume 29 Issue 2 Pages 173-178
Published: 1981
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSThe K+ thermal ions emitted in the same time from bare and partly coated surfaces of a polycrystalline tungsten ribbon with potassium nitrate have been discriminated by the measurement of energy distribution curves of the ions. The distribution curves have been obtained by the technique of electrical differentiation of the retarding voltage curves in a method similar to Auger electron spectroscopy with a four-grid low energy electron diffraction optics. The assignment of emission surfaces for K+ thermal ions emitted in the same time has been made clear by a comparison with retarding voltages at maximum of the energy distribution curves for K+ thermal ions emitted from two different polycrystalline tungsten ribbons with bare and wholly coated surfaces with potassium nitrate.View full abstractDownload PDF (371K) -
Isao Nishi, Giichi Tomizawa, Hiroshi Shibuya, Hitoshi Ishii, Lumi Tats ...1981 Volume 29 Issue 2 Pages 179-190
Published: 1981
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSA new twin ion source mass spectrometer has been constructed for the application of simultaneous meaurement of respiratory and blood gases. The ion optics is such that two ion beams of same m/z from two ion sources are analyzed through a common magnetic field and are simultaneously received by the respective collectors. The gases measured are CO2, N2O, Ar, O2, N2, and C2H2, and they are detected on 44, 40, 32, 30, 28, and 26 (a,m,u). The ions are measured by multi-ion detection system which consists of amplifiers and integrators for the ion peak detection, sample-holders which separate and hold the peaks, the microcomputer (8085 CPU) with its interface, and of the molecular peak calculator. For the respiratory gas analysis, automatic calibration is carried out. The computer system is employed to determine and produce the scanning voltages and to control the integrators and sample-holders.
The spectra from two ion sources are proved to be perfectly resolved with all scanning volteges on the respective collectors. Mixing of the samples between two sources is of the rate of 1/30 and compensated by the analogue circuit with satisfactory precision.
Thus the simultaneous measurement was carried out within the error of 0.05% to the full scale for the respiratory gases, and within the error of 0.2 Torr CO2 and 0.5 Torr O2 respectively, for 76 Torr blood gases.View full abstractDownload PDF (742K) -
Oxidation in Shock WavesYoshiaki Hidaka, Yoshinori Tanaka, Hiroyuki Kawano, Masao Suga1981 Volume 29 Issue 2 Pages 191-198
Published: 1981
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSThe oxidation of C2-hydrocarbons (ethane, ethylene, and acetylene) was studied with a shock tube connected with a mass spectrometer over the temperature range from 1300 to 2000 K and the total pressure ranging from 200 to 400 Torr in the O2/fuel ratios 1.25 - 4.5. The induction period (τ) was determined by monitoring the oxygen concentration, and the following equations were found to hold:
Ethane; τ=1.15×10-10 [C2H6]1 [O2]-1 exp (30000/RT),
Ethylene; τ=2.45×10-14 [O2]-1 exp (23000/RT),
Acetylene; τ=9.94×10-14 [O2]-1 exp (17000/RT),
where τ and the concentrations are expressed in s and mol/cm3, respectively.View full abstractDownload PDF (487K)
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