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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 3
Displaying 1-8 of 8 articles from this issue
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Toshihiro Fujii, Akio Yasuhara, Yoko Yokouchi, Yoshinari Ambe1978 Volume 26 Issue 3 Pages 209-232
Published: September 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (2832K) -
-A New Technique for Elucidating the Organic lon Structures-Ikuo Sakai1978 Volume 26 Issue 3 Pages 233-249
Published: September 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1632K) -
Mitsuru Asano, Toshio Harada, Kenji Kubo1978 Volume 26 Issue 3 Pages 251-258
Published: September 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA specially designed retarding field energy analyzer has been set in the front of a quadrupole mass filter for studying the energy distribution of thermal ion emitted from a hot metal surface. The distribution curve and its derivative are obtained by the technique of electrical differentiation of the retarding voltage curve in which a small sinusoidal modulation voltage is applied to the two retarding grids in a method similar to Auger electron spectroscopy with a four-grid low energy electron diffraction optics. The effects of frequency and amplitude of the modulation voltage on fundamental and second harmonic components being proportional to the energy distribution function and its derivative have been investigated. The results have been applied to study the energy distributions of Na+, K+ and Rb+ thermal ions emitted from a tungsten ribbon.View full abstractDownload PDF (693K) -
Hiroshi Kishi, Satoshi Kambe1978 Volume 26 Issue 3 Pages 259-268
Published: September 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMass spectra of 7H-thiazolo[3, 2-a]pyridine derivatives were measured by electronimpact ionization mass spectrometry. The substituents on the phenyl group were H, p-CH3, p-OCH3, p-Cl, p-NO2. The methyl or ethyl esters were also examined. The fragmentation patterns were deduced with the aid of the shift of the peaks by substituted groups and by deuterated derivatives. And they were confirmed by metastable peaks. Substituent effect of the phenyl groups on the fragmentation was only observed in the change of intensity of fragment ions, but not observed as the change of fragmentation pathway. On the other hand, fragmentation pathway was changed by the ester groups.View full abstractDownload PDF (691K) -
Jun-ichi Iwamur, Hideo Hosotsubo, Nenokichi Hirao1978 Volume 26 Issue 3 Pages 269-274
Published: September 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMethyl esters of acyclic terpenic acids were isolated from the roots of Cyperaceae plant, and analyzed by gas chromato-graphy-mass spectrometry. The characteristic ion at m/e 114 was found in the all of their mass spectra. The structure of this ion is identified as CH2=C(CH3)-CH=C(OCH3)OH+on the basis of the mass spectra of the derivatives and deuterium labelling studies. The characteristic ion at m/e 100 was found in the mass spectra of nonbranched α, β-unsaturated fatty acid methyl esters. These ions were useful to clarify the structure of the methyl esters of acyclic acids and α, β-unsaturated fatty acids.View full abstractDownload PDF (567K) -
Hiroko Endo, Minoru Hirota1978 Volume 26 Issue 3 Pages 275-279
Published: September 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSEI mass spectra of several ortho-substituted N, N-dimethylbenzamides were presented and their fragmentation pathways were discussed. A remarkable ortho-ef fect is observed with the dehalogenation process of halogen-substituted derivatives.View full abstractDownload PDF (408K) -
Masaya Iwanaga, Kiyoshi Hosoi, Shozo Onishi1978 Volume 26 Issue 3 Pages 281-286
Published: September 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThree kinds of isomers of cresol trimethylsilyl ethers were analyzed using a gas chromatograph-chemical ionization mass spectrometer with mass fragmentography technique to find any difference between these isomers in various conditions, such as reagent gases(anmonia, methane and iso-butane)and the ion source temperature(200°C∼290°C). With anmonia as a reagent gas, the peak intensity ratios of m/e 180 to m/e 181 show remarkable differences between m-, o-and p-cresol trimethylsilyl ethers at 290°C of the ion source temperature.View full abstractDownload PDF (424K) -
Hisashi Matsuda1978 Volume 26 Issue 3 Pages 287-299
Published: September 30, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe design and performance of a small double focusing mass spectrometer is described. The instrument consists of a cylindrical condenser(φm=25°, re=5.5cm)and a homogeneous magnet(φm=50°, rm=5cm). The whole apparatus including the ion multiplier is enclosed in a aluminum cylinder of 5cm diameter and 23cm length. The weight of magnet with exciting coil is only 2kg. The magnet gap is 4mm and the maximum magnetic field of 6000 gauss is obtained at 2000 AT. The ion accelerating voltage is 230V. The adjustment of focus can be achieved by changing the electric potential applied to the Matsuda-plates which are placed at the both ends of cylindrical condenser. The mass spectrum of any mass range in M=1∼200 can be recorded with a resolution of 70(10% valley)by magnetic scanning and the mass spectrum of 15% mass range can be observed on the oscilloscope screen. The whole electric power supply is very simple and is constructed in a small box(14×18×25cm3). The detailed circuit diagrams are given. The partial gas pressure of 10-12 Torr is detectable.View full abstractDownload PDF (4637K)
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