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Volume 26 (1978)
- Issue 4 Pages 301-
- Issue 3 Pages 209-
- Issue 2 Pages 113-
- Issue 1 Pages 1-
Volume 26, Issue 4
Displaying 1-6 of 6 articles from this issue
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Ryoshi Ishiwatari1978 Volume 26 Issue 4 Pages 301-311
Published: December 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1226K) -
Tatsuo Arikawa, Satiomi Kaneko1978 Volume 26 Issue 4 Pages 313-320
Published: December 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA computer simulation of the Hadamard beam spectroscopy has been attempted to show its utility and feasibility for various experimental situations in a beam spectroscopy.A simple one-dimensional case to measure spatial beam distributions is demonstrated. In simulations, an incident beam distribution is produced with the aid of a random sampling number, as is conventionally clone just in the Monte Carlo method. The incident beam is encoded by a fifteen-slot Hadamard mask located in front of a detector. Reconstructions of the initial beam distribution from the encoded data are achieved by the process of inverse Hadamard transform. Results of the computer simulation show that the new beam technique by means of Hadamard transform has many of advantages over the conventional point-by-point measuring technique and would be successfully applied to a mass spectroscopy, an energy spectroscopy, or other beam spectroscopic measurements.View full abstractDownload PDF (626K) -
Yuukou Nagatoro, Shohachi Suzuki, Ken-ichi Ochiai, Akira Kaya1978 Volume 26 Issue 4 Pages 321-332
Published: December 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe quadrupole type mass spectrometer system for the precise determination of 235U isotope ratio of UF6 has been developed. Fundamental performances, such as inlet and evacuation characteristics, resolution, relative sensitivity, pattern coefficients, isotopeion current detection characteristics were measured and examined carefully on this quadrupole type mass spectrometer for UF6. The operational stability of this quadrupole type maas spectrometer was good. 235U and 238U isotope peak was resolved perfectly. Secondary electron multiplier tube was effective for rapid measuring low ion current with high efficiency, but it had about 3% systematic error on determination of 235U isotope ratio. It was able to correct this error easily by calibration with standard sample. Results of the performance tests were good. 235U isotope ratio measurements were carried out by use of many UF6 standard samples. The precision and the accuracy of the measurements were less than ±0.3% under appropriate operating conditions attained. The time required for measuring one sample was less than five minutes.View full abstractDownload PDF (1279K) -
Masahiko Tsuchiya, Tetsuji Taira1978 Volume 26 Issue 4 Pages 333-342
Published: December 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSWe have developed a new ionization method for organic compounds in liquid phase at atmospheric pressure. The first process in this ionization reactions occured on the liquid surface is thought to be Penning ionization in which the excitation energy transfers from excited molecules of carrier gas to sample molecules, producing molecular ions. The subsequent reactions which may be the proton and/or hydrogen atom transfer between M+ and the surrounding molecules, involving charge transfer and chemical ionization reactions produce MH+ ions and several fragment ions. Characteristics of asimple ionization detector and a modified quadrupole mass spectrometer utilizing this method were described. Abundant M+ and MH+ ions were observed at near room temperature(∼ca. 40°C)for several less volatile compounds, such as dibutyl phthalate, chlorpheniramine, indomethacin etc., which give no or a small amount of molecular ions by EI and methane CI methods. Mass spectra of intermolecular cluster ions, such as(CH3COCH3)nH+(H2O)m(n=-1, m=1∼8;n=2, m=1∼4, shown in Figs.6 and 7)were also obtained.View full abstractDownload PDF (851K) -
Masao Tohno, Yuzuru Matsumura, Tatsuya Ofuji, Akira Tatematsu, Makoto ...1978 Volume 26 Issue 4 Pages 343-352
Published: December 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSSelected ion monitoring has heen developed for the determination of two glucuronides detected in human urine after oral administration of befunolol(BF). It was confirmed that not only multi-deuterium labelled compound(I-d6)but also mono-deuterium labelled one(I-d1)were useful internal standard at determination of the common aglycone, 2-(1-hydroxyethyl)-7-(2-hydroxy-3-isopropylaminopropoxy)benzofuran of these glucuronides. The glucuronides had been identified as O-glucuronide of side-chain of I(II)and O-glucuronide of 2-side-chain of I(III). Each glucuronide was determined by the combination of enzymatic hydrolysis, thin layer chromatography and selected ion monitoring using II-d1 as internal standard. The overall recoveries(%)of II and III were 101.3±1.9(SE)and 101.1±1.4(SE)respectively. Over 70% of dose determined as I, II and III in the urine of man received BF 15-20 mg orally. It can therefore be presumed that major metabolic pathway of BF in man is the reduction followed by the glucuronidation.View full abstractDownload PDF (828K) -
Takeshi Inagaki, Yasuo Iwanami1978 Volume 26 Issue 4 Pages 353-358
Published: December 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMass spectra of 3-alkoxycarbonylmethylene-2(1H)-quinoxalinones(I∼IV)and 3-alko-xycarbonylmethylene-2H-1, 4-benzoxazin 2-ones(VII and VIII)are examined . Most of thesecompounds are shown to exist in the enamine form with an internal hydrogen bonding in the crystalline, solution and gaseous states. Especially, the present mass spectral studies gave supports for the structure in the gas phase. 3-(1-Ethoxycarbonylethyl)-2(1H)-quinoxalinone(V) and 3-(2-ethoxycarbonylethyl)-2(1H)-quinoxalinone(VI), however, exist in the imine form, and mass spectral fragmentation pathways are understood as arising from the imine form of the molecular ion(M+). These fragmentations are confirmed by deuterium labeling experiments.View full abstractDownload PDF (524K)
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