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Volume 21 (1973)
- Issue 4 Pages 263-
- Issue 3 Pages 203-
- Issue 2 Pages 117-
- Issue 1 Pages 1-
Volume 21, Issue 4
Displaying 1-8 of 8 articles from this issue
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SHIGETOMO KITA, KENICHI NIURAO, HOKOTOMO INOUYE1973 Volume 21 Issue 4 Pages 263-270
Published: December 28, 1973
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSThis article describes a simple ion emission regulator for a surface ionization ion source in the current range of 10-7-10-9A. The principle of regulation is quite similar to that of an electron emission regulation for an ionization vacuum gauge, except that the regulator has a simple electrometer circuit. The stability is about 1% after running of 1 hour, if a stabilized a. c. power supply is used. The regulator has been successfully employed in an ion beam experiment using hydrogen as a target gas.View full abstractDownload PDF (1993K) -
HISASHI MATSUDA1973 Volume 21 Issue 4 Pages 271-275
Published: December 28, 1973
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSThe merits of a mass spectrometer with crossed electric and magnetic fields are discussed. The electric field is assumed to be a toroidal one (field index c) and the magnetic field homogeneous. In the case c=-1 the stigmatic double focusing is obtained and the Barber's rule holds. If the toroidal electric field is produced by a cylindrical condenser having a pair of Matsuda plates, the directional focusing can be adjusted by changing the electric potential applied to the Matsuda plates and the velocity focusing can be adjusted by changing the ratio of electric and magnetic fields independently to each other. Therefore, all focal adjustments can be done electrically and no mechanical adjustment is necessary. This type of mass spectrometer works also as a single focusing apparatus under very weak magnetic field if appropriate potentials are applied to the condenser electrodes and Matsuda plates.View full abstractDownload PDF (434K) -
MASAO NOMURA, MAKOTO OKAMOTO, HIDETAKE KAKIHANA1973 Volume 21 Issue 4 Pages 277-281
Published: December 28, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe isotope ratio of boron was determined by the surface ionization method using a Varian MAT CH-5 mass spectrometer with sufficient accuracy. A statistical treatment of the data indicates that the value obtaind by each measurement consisting of 5 blocks is precise and reproducible and its standard deviation is smller than 0.1%.View full abstractDownload PDF (422K) -
SHUZO TAMURA1973 Volume 21 Issue 4 Pages 283-292
Published: December 28, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSTraces (0.6∼130ppm) of boron in heat-resisting alloy standards of J AERI(Japan Atomic Energy Research Institute)and of NBS(National Bureau of Standards, U. S.)were determined by isotope dilution mass spectrometry which involved addition of 95% enriched boron-10 as the spike and isolation of boron from acid solution of samples by methyl borate distillation. The tantalum ribbon single filament technique was used for isotopic analysis of boron. Except for one JAERI standard, the results obtained by isotope dilution gave a relative standard deviation of less than 3%. Determination of boron in boron-added water samples, fly ash standard NBS 1633 and geochemical rock standards JG-1 and JB-1 was also carried out for comparison.View full abstractDownload PDF (679K) -
TSUTOMU MAKITA, HIROSHI KISHI, KUMASABURO KODERA1973 Volume 21 Issue 4 Pages 293-301
Published: December 28, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAtomic negative ions were studied for eighty one different elements by means of double focusing mass spectrograph. Over one hundred twenty different sample materials were ionized by pulsed radio-frequency vacuum spark discharge.Special features for the negative ion mass spectra were discussed and compared with positive ion mass spectra. Fourty eight the elements were detected as atomic negative ions, and the results were discussed with literature values of the electron affinity for the atoms. Chemical analysis by negative ion mass spectra was briefly discussed.View full abstractDownload PDF (403K) -
Metabolites of Disopyramide in RatAKIRA TATEMATSU, TANEKAZU NADAI, HIDEO YOSHIZUMI, MAKOTO SUZUKI, NOBOR ...1973 Volume 21 Issue 4 Pages 303-315
Published: December 28, 1973
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSDuring several years, we have studied drug metabolites by using mass spectrometry. The mass spectrometry gives us a lots of information for metabolites by very small amount(below 0.1 μg)of samples in the urine and bile in the very short time.However, there are several occasions in which the sample is thermally unstable or the molecular ion peak would not appear in the ordinary electron impact mass spectra(EI-MS).
We therfore prepared an ion source for chemical ionization mass spectra(CI-MS)and found that this technique is superior to the commonly used EI-MS for identification of drug metabolites.View full abstractDownload PDF (743K) -
SHIZUKO EGUCHI, YOSHIHIRO NODA, AKIHIKO MATSUO, MITSURU NAKAYAMA, SHUI ...1973 Volume 21 Issue 4 Pages 317-325
Published: December 28, 1973
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSMass spectra of some o-hydroxyacetophenones were studied. The fragmentation is discussed on the basis of high resolution data and deuterium labeling. The resulting fragment patterns are clearly influenced by the position of the methoxy group.
It is shown that the significant structural information can be obtained from mass spectra of o-hydroxyacetophenones.View full abstractDownload PDF (524K) -
KINJI HIRAMATSU1973 Volume 21 Issue 4 Pages 327-332
Published: December 28, 1973
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSUnder the various conditions of pyrolysis, HCN, CO and other poisonous gases generated from polyurethane foam were examined. The results showed that, under the fuel rich air atmosphere, about 0.1 wt.% and about 4 wt.% of the initial polyurethane foam samples are converted into HCN and CO, respectively. This amount (wt.%) of HCN generated from polyurethane foam is only about 1/60 compared with that generated from polyacrylonitrile.
By the mass spectrometric analysis of the pyrolytic products from polyurethane foam, these products contained lower grade aliphatic hydrocarbons, alcohols, aromatic hydrocarbons and other various compounds and the complete analysis of all components was very difficult.View full abstractDownload PDF (527K)
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