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Volume 19 (1971)
- Issue 4 Pages 254-
- Issue 3 Pages 179-
- Issue 2 Pages 88-
- Issue 1 Pages 1-
Volume 19, Issue 1
Displaying 1-6 of 6 articles from this issue
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TATSUO ARIKAWA1971 Volume 19 Issue 1 Pages 1-17
Published: March 30, 1971
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSElectron model experiments of a perfect focusing mass spectrometer were carried out with respect to the perfect velocity focusing and to the perfect directional focusing. The validity of these perfect focusing properties was verified by the use of electrons in energy from 103eV down to 10eV or less. A luminousity of more than98%was attained in the lower energy range and90% in the higher energy range for both cases of s=1and s=2, where s is a field parameter connecting electric field with magnetic field. A resolution of this spectrometer was also measured as a function of various experimental parameters such as an acceleration energy of electrons, field parameter s, a detector width or a position of the detector. These experimental results were compared with the results of calculations by an electronic computer. They showed good agreement within the experimental errors.View full abstractDownload PDF (2967K) -
R.D. RUSSELL, J. BLENKINSOP, R.D. MELDRUM, D.L. MITCHELL1971 Volume 19 Issue 1 Pages 19-36
Published: March 30, 1971
Released on J-STAGE: July 05, 2011
JOURNAL FREE ACCESSThree magnetic sector mass spectrometers have been interfaced with an Interdata Model4computer, which services them on a time sharing basis. Each mass spectrometer is equipped with a digital display at its console. This can be updated by the computer as required by the program instructions, with data selected by the setting of a console selector switch. The system can be operated in various modes. In the simplest mode, the ion current amplitudes are read into the computer at regular intervals, and are returned to the console display after digital filtering. Another mode provides for the storage of filtered data on digital magnetic tape, together with necessary information about scan rate and direction, and amplifier sensitivity. The tape represents a full description of the analysis, which can be processed later on the same or a larger computer. The third mode, as yet only tested for strontium isotope analysis, provides for real time processing of the spectrum. The computed isotope ratios are displayed at the console as the spectrum is scanned, so that the operator can observe the convergence of their averages. If he wishes, he can also observe the present estimates of the standard deviations of the average ratios. The three mass spectrometers may be operated simultaneously in different modes. In addition to data handling functions, the computer may be programmed to control the operating conditions during the analysis. To date, only the scan rate has been controlled in this way. The present paper presents a general description of the system and of its operation.View full abstractDownload PDF (1437K) -
R. D. Russell1971 Volume 19 Issue 1 Pages 37-47
Published: March 30, 1971
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSSeveral circuit diagrams are presented for mass spectrometer power supplies. In all cases, the principal control element is a silicon controlled A. C. switch(TRIAC) which determines the duty cycle of the primary line power to the supply. The pulse oscillator with integrated circuit amplifier, required to drive the TRIAC, is also common to all supplies. It is mounted on a plug-in printed circuit board. It is a null sensing device;that is, its input voltage and current are both zero at balance. The phase of the pulse train is locked to the phase of the line voltage, and the position of the pulses in time determines the duty cycle. The circuits presented show the use of the TRIAC in a solid source(triple)filament current supply, an emission regulator for gas source mass spectrometers, a magnet current supply, and a vacuum gauge supply.View full abstractDownload PDF (746K) -
KATSUHISA CHIDA, KUMETARO KANEKO, KATSUHIKO IWATA, MITSUO SAKAI1971 Volume 19 Issue 1 Pages 49-74
Published: March 30, 1971
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCharge states and kinetic energies of scattered Ar ions and recoiled ions in collision of30keV Ar ions with Mn, Fe, Co, Ni, Cu, Zn, Ge, Ag, Cd, Sb, Ta, Pt, Au and Pb targets were measured at the direction of angle 70°. The targets were placed on the focal plane of the INS isotope separator. We observed the spectra consisting of sharp peaks and a continuous background. It was confirmed from the peak positions that the collisions between the incident Ar ions and the target materials are of quasi-elastic character. However, an energy difference of about500eV which can be interpreted as inelastic energy loss was observed. Cross sections of scattered ions were measured and excitation curves are discussed. In the case of Nd2O3target, we found the collisions to be considered as independent collisions of Ar ions with individual Nd and O atoms due to decomposition of the Nd2O3molecule in the ion impact. The shoulder which was always observed in the high energy side of the peak was found to be explained quantitatively as a result of double scattering. The background was discussed in terms of multiple-scattering and energy absorption in the target.View full abstractDownload PDF (1461K) -
TSUGIO TAKEUCHI, KOZO MATSUMOTO, MASAHIRO SUGIURA1971 Volume 19 Issue 1 Pages 75-80
Published: March 30, 1971
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSBy means of the openly combined GC(TCD)-MS(Solid Disk Enricher(SDE)-Mattauch-Herzog Type), the relation between GC-injected sample size and area of the repeated rapid scanning method fixed to one mass was discussed. A part of the GC-injected sample escapes together with helium as a carrier gas from the outlet of the column and SDE, but the amount of MS-detection is approximately proportional to that of GC-detection; the half-width of the peak of the former is approximately1. 6times as wide as that of the latter. It was confirmed that GR benzene contained0.069±0.006%of toluene as a microimpurity and that a detectable amount of toluene in the n-hexane solution was0.01%, which was3×10-5μl of toluene at m/e91as an absolute detectable amount.View full abstractDownload PDF (353K) -
M. ARATANI1971 Volume 19 Issue 1 Pages 81-82
Published: March 30, 1971
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (678K)
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