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Volume 30 (1982)
- Issue 4 Pages 281-
- Issue 3 Pages 219-
- Issue 2 Pages 129-
- Issue 1 Pages 31-
Volume 30, Issue 2
Displaying 1-7 of 7 articles from this issue
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REGULAR PAPERS
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Zhiru Wu, Hisashi Matsuda1982 Volume 30 Issue 2 Pages 129-135
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSA single focusing mass spectrometer with large incident and exit angles has been constructed. The radius of the magnetic field is 50 mm and both incident and exit angles are 55°. The deflection angle is 130°. A small electromagnet produces a maximum magnetic field of 5500 gauss in the magnet gap of 5 mm. A resolving power of 580 was obtained with 0.05 mm source slit and 0.10 mm collector slit. The mass spectra of H2+ - He++ doublet and He+ - D2+ doublet are given. The experimental results have shown that this ion optical system gives resolving power three times as big as that of single focusing mass spectrometer with normal incident and exit.View full abstractDownload PDF (380K) -
Takehiro Takeda, Toshiyai Kubodera1982 Volume 30 Issue 2 Pages 137-143
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSA new type of double-focusing mass spectrometer (DF/MS) has been designed. The instrument is a reversed-geometry type DF/MS and makes use of toroidal electrodes and specifically shaped pole pieces of the magnet in order to improve the second-order aberration coefficients. The toroidal electrodes with a field index of 0.5 form the concave entrance and exit surfaces. The magnet supplies a homogeneous field and its pole pieces form concave entrance and oblique exit surfaces. The feature of the present ion optics system is in making the ion beam which emerges out of the ion source slit (Si) converge solidly onto the collector slit (Sc).
The ion optics system has been designed by means of the newly developed computer program which takes into accunt the recent results of the theory on the ion beam. One can search for the resolutions by inputting the criterion values for the second-order aberration coefficients into the program.View full abstractDownload PDF (284K) -
Atsushi Shigihara, Hiroshi Ichikawa, Masahiko Tsuchiya1982 Volume 30 Issue 2 Pages 145-152
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSSimple cleavages of protonated acetates are studied by MINDO/3. Heats of formation for two possible sites of protonation including geometrical isomers are compared; protonation at the carbnyl oxygen appears to be more stable than that at the ether oxygen in ethyl, n-propyl, and iso-propyl acetates. The difference ranges from 16 to 29 kcal/mol depending on the geometries of the protonated esters. The barrier of the interconversion between the two possible protonated structures and the potential energies of fragmentation are estimated. The results obtained were discussed in relation with the role of the proton. The optimized geometries of the protonated acetates were examined by comparing with that of ethyl acetate. The detailed organic-chemical expressions for the simple cleavages were proposed on the results of the MO calculations.View full abstractDownload PDF (445K) -
Tetsuo Nagata1982 Volume 30 Issue 2 Pages 153-161
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSTotal cross sections for single-electron capture by H+ in collisions with Cs, Rb, K, and Na atoms have been measured in the H+ energy range from 0.3 to 5.0 keV. Attenuation method was used to avoid the problem of detection efficiency of neutral H0 atom, and the accuracy was improved to a considerable extent in comparion with the previous results which were obtained in this laboratory from growth of collision products H0. Except the case of Na, the present study confirms the previous results, and agreement with other experimental and theoretical results is satisfactory in both general energy dependence and absolute magnitude. The cross sections for Rb and K targets show the structure which probably arises from interaction of charge-exchange channels with closely-lying excitation channels of alkali atom and/or secondary long-range interactions between charge-exchange channels.View full abstractDownload PDF (567K) -
Quantitative Analysis of Oxygen in Oxygen-Doped Polycrystalline Silicon Films with Ion MicroanalyzerYoshiaki Okajima, Yasuhiro Mochizuki1982 Volume 30 Issue 2 Pages 163-167
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSQuantitative analysis of oxygen in polycrystalline silicon films doped with oxygen atoms was investigated with an ion microanalyzer. O+, SiO+ and Si2O+ ions were detected as secondary positive ions under 10 keV Ar+ ion bombardment. The detection sensitivities of SiO+ and Si2O+ ions were 10 times over that of O+ ions. The blank level of Si2O+ ions was smaller than that of SiO+ ions. A linear relation was obtained between the intensity ratio of Si2O+ to Si2+ and oxgen concentration determined by infrared spectroscopy.View full abstractDownload PDF (268K) -
Hideki Kambara, Yukiko Ogawa, Kohei Mochizuki, Shinzaburo Hishida1982 Volume 30 Issue 2 Pages 169-181
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSSecondary ion mass spectra of bio-organic compounds are presented. The spectra obtained with glycerol matrix differ from those obtained without glycerol(dry surface). Saccharides, glycoside, peptides, antibiotics, and vitamins are investigated. The molecular ions for some of them can hardly be observed even in the FD spectra. However, the protonated molecules for all of these compounds are readily observed in their SIM spectra.View full abstractDownload PDF (737K)
TECHNICAL REPORT
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Assembly and It's OperationMasana Arimura, Yozaburo Yoshikawa1982 Volume 30 Issue 2 Pages 183-191
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSFor the effective measurement of internal energy correlations of ions, a tandem type mass spectrometer was built. The spectrometer was introduced for the study of unimoleculer decompositions and ion-molecule reactions. The spectrometer has the same 60° sector type magnets with a 7 cm radius. This is now used only for the measurments of unimoleculer decompositions but will be used for ion-molecule reactions with a little rearrengements. In measurements of the uni-molecular decompositions the time constants are given;
t1=1.44 {1.5×(M/V)½+2(M/V)} × 10-7+8.63(M/V)½ × 10-6
t2=1.60(M/V)½×10-5+t1, t3=3.59(M/V)½ × 10-5+t1
In this time region, the calculated data based on simple QET theory of metastable decomposition of moleculer ions depend only on the energy which would be given thermally. The decomposition rates correlate well with the activation energy (or appearance energy) of the product ions. The multi-scanning and integrating data have been performed by a personal computer “PET” through IEEE-488 (GP-IB) bus lines with the controlled interface made of popular digital I. C.View full abstractDownload PDF (508K)
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