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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 4
Displaying 1-7 of 7 articles from this issue
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Ken-ichi Kanazawa, Tatsuo Arikawa1982 Volume 30 Issue 4 Pages 281-287
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSA new crossed-beam scattering apparatus "Perfectron" requires a uniform magnetic field to realize its perfect focusing property in combination with a three dimensional quadrupole electrostatic field. As is well known, a spherical air-core coil produces a uniform magnetic field (in the z axis) within its whole domain. The strength of the magnetic field B (in gauss) is given by B = (4π/15) NzI, where Nz and I denote the number of winding in turns/cm in the z axis and the exciting current in Ampere. We have, therefore, constructed a large spherical coil of about one meter in diameter, inside which a whole scattering chamber is housed. The coil is designed to provide the maximum magnetic field of 650 gausses with water-cooling and 250 gausses without water-cooling. A deviation of the magnetic field caused by coil imperfections which are compelled to do so from experimental requirements is also designed to be less than 0.5 % in the central region of the coil.View full abstractDownload PDF (459K) -
Tatsuo Arikawa, Ken-ichi Kanazawa1982 Volume 30 Issue 4 Pages 289-296
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSRelative energy spectra of sputtered alkali ions from three alkali-halide crystals (LiF, NaCl, and KCl) were measured by bombarding the energetic rare gas ions (He+ and Ar+) whose energies ranged from 10 keV up to 100 keV. It was found that the energy spectrum of K+ ions from a KCl crystal were in close agreement with the energy spectrum of sputtered ions from the metal surface in both respects of the shape and the peak position, whereas Na+ ions from an NaCl crystal were likely to fit to the energy spectrum of neutral atoms rather than that of ionic one, and Li+ ions sputtered from an LiF showed also neutral spectrum with slightly different asymptotic behaviors in the higher energy region.View full abstractDownload PDF (505K) -
Shigeru Ikuta1982 Volume 30 Issue 4 Pages 297-304
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSThe hydration energies for the NH4+ and OH3+ ions were calculated by an ab initio MO method with the 3-21G and 6-31G* basis sets. 6-31G* values were found to be in good agreement with the experimental ones. The aqueous solvation energy difference between these two ions could be accounted for by the interactions of the corresponding ion with a few solvent molecules, as suggested by Kebarle, Hehre and Taft. On the basis of the calculated results, the aqueous solvation effect on the proton transfer reaction, NH4+ + OH2 = NH3 + OH3+, was studided. The most part of the aqueous solvation effect upon the proton transfer reaction can be accounted for by the aqueous solvation energy difference between two ions (NH4+ and OH3+); the aqueous solvation energy difference between two neutral molecules (NH3 and OH2) is really quite small.View full abstractDownload PDF (494K) -
Masahiko Tsuchiya, Hirofumi Kuwabara1982 Volume 30 Issue 4 Pages 305-312
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSVariety of cluster ions were observed by using the liquid ionization mass spectrometer we have developed. 6,9) Metastable argon atoms were used to ionize a liquid sample at atmospheric pressure. This paper describes cluster ions composed of water, ethanol, a mixture of methanol and ethanol, acetonitrile and acetone molecules. Major ions observed were (H2O)nH+, (C2H5OH)nH+, (CH3OH)nH+(C2H5OH)m, (CH3CN)nH+H2O and (CH3COCH3)nH+H2O, respectively. Hydrogen bonds played important roles for formation of cluster ions.
A molecule containing a hydroxy group combined with two molecules, because an oxygen atom of the hydroxy group combined with two hydrogen atoms. Therefore molecules of methanol and ethanol combined each other nearly freely by hydrogen bonds. In contrast, a molecule of acetonitrile or acetone was restricted to combine other molecules in production of cluster ions, because a nitrile or a carbonyl group was able to produce only one hydrogen bond. The method gives information about cluster ions which may be related with cluster molecules existed at liquid surface and/or in gas phase where hydrogen bonds are important.View full abstractDownload PDF (432K) -
Hirofumi Kuwabara, Masahiko Tsuchiya1982 Volume 30 Issue 4 Pages 313-318
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSMetastable argon atoms at atmospheric pressure were used to ionize organic compounds and an emitter for field desorption was used as a sample holder. The effect of electric field, temperature and additives were investigated for involatile compounds like nucleosides. High voltage applied to the emitter and a matrix increased the abundance of MH+ ions significantly and long-lasting good mass spectra were obtained. A needle emitter was better than a silicon emitter and Nujol (liquid paraffin) as a matrix was better than glycerol for thermolabile compounds having small proton affinities such as guanosine and creatine.View full abstractDownload PDF (299K) -
Mamoru Ohashi, Kazuo Tsujimoto, Shuzo Yamada, Shigehiro Sato, Hiroshi ...1982 Volume 30 Issue 4 Pages 319-324
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSThe electron impact-induced fragmentation of 1-benzoylbenzotriazole (1) has been discussed on the basis of MIKE spectra of the related compounds. The metastable abundance ratios, metastable peak shapes, and KE releases for the transition of m/z 195→167 in the second field free region demonstrate that the ion at m/z 195 produced by loss of N2 from the molecular ion of 1 is identical with the molecular ion of 2-phenyl-benzoxazole. The possible contribution of an electronically excited molecular ion to the fragmentation process reported previously by the 13C-labelled experiments is again suggested. The hydrogen and methane CI spectra of 1 are also given in which characteristic fragmentation leading to benzoyl and protonated 1H-benzotriazole ions is demonstrated.View full abstractDownload PDF (302K) -
Shizuko Eguchi, Akihiko Matsuo, Mitsuru Nakayama, Daisuke Takaoka, Sh& ...1982 Volume 30 Issue 4 Pages 325-335
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSThe mass spectra of fifteen diterpenoids belonging to the new carbon skeletons of verrucosane, neoverrucosane and homoverrucosane are examined. From their spectra the relationship between fragmentation patterns and substituted modes of these diterpenoids is discussed.View full abstractDownload PDF (533K)
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