巻号一覧
22 巻 (1974)
- 4 号 p. 233-
- 3 号 p. 173-
- 2 号 p. 121-
- 1 号 p. 1-
22 巻, 4 号
選択された号の論文の9件中1～9を表示しています
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SHIGERU IKUTA, KENJI YOSHIHARA, TAKANOBU SHIOKAWA1974 年 22 巻 4 号 p. 233-238
発行日: 1974/12/31
公開日: 2010/06/28
ジャーナル フリーThe breakdown curves of various CH3X after charge exchange reactions were obtained using a double mass spectrometer of the perpendicular type, and it was found that the C-X bond was easy to dissociate in methylhalides(Group A)whereas it was not in methylamine, methanol and methylmercaptan(Group B). The difference of the C-X bond rupture between two groups was well explained on the basis of the eigenvectors calculated by the Extended Hiickel Molecular Orbital method. It is obvious that the fragmentation directly occurs at the bond at which the electron is ejected.抄録全体を表示PDF形式でダウンロード (399K) -
SHIGERU IKUTA, KATSUNORI HARADA, KENJI YOSHIHARA, TAKANOBU SHIOKAWA1974 年 22 巻 4 号 p. 239-244
発行日: 1974/12/31
公開日: 2011/07/05
ジャーナル フリーApplicability of the MO interpretation for the phenomena of fragment ionization processes in ethanol and ethylamine has been studied. The double maxima of the C2H4OH+ ion and of the CH2OH+ ion, which are not easily accounted for by the quasi-equilibrium theory, were well explained by our molecular orbital calculation. It was also found that appearance of fragment ions and that of the band in photoelectron spectra in these substances are correlated to each other. From these results it was confirmed that bond scission occurs at the bond at which the electron is ejected.抄録全体を表示PDF形式でダウンロード (533K) -
SHIGERU IKUTA, KENJI YOSHIHARA, TAKANOBU SHIOKAWA1974 年 22 巻 4 号 p. 245-249
発行日: 1974/12/31
公開日: 2010/06/28
ジャーナル フリーApplicability of our theory for the phenomena of fragment ionization processes to large molecules and to the effect of configuration of the molecules was studied. Two kinds of propanols and four kinds of butanols were treated for the above purpose. It was clearly found that the differences of the mass spectra by different configurations of the molecules are well interpreted by our interpretation including the molecular orbital treatment. Therefore, it is clear that the mass spectra by electron impact may be also predicted by molecular orbital assignment in various occupied molecular orbitals.抄録全体を表示PDF形式でダウンロード (370K) -
HIROYUKI KAWANO1974 年 22 巻 4 号 p. 251-268
発行日: 1974/12/31
公開日: 2010/06/28
ジャーナル フリーA simple ion source was designed and developed to study the thermal ionic and neutral emission from thick layers of unitary alkali halide(MX)deposited on a metal surface. Besides a platinum ribbon(F1, 0.02 cm2 )functioning as the substrate metal, this ion source has a second platinum filament(F2)as a neutral beam detector and also a grid(G)between F1 and F2 in order to retard the ions emitted from F1 or F2. A part of the neutral molecules(MX1°)evaporating from F1 is ionized with F2 after passing through G. In this work with potassium fluoride, the ion source was found to be quite useful as an instrument by which the primary and secondary positive ions(M1+and M2+)emitted from F1 and F2, respectively, were separated without employing any additional separator. The collection efficiency of M1+ was so high (about 41%), and hence such a weak positive ion emission from F1 as about3×103 ions/sec 0.02 cm2 at about 350°C could be detected with a vibrating reed electrometer with a maximum sensitivity of 1×10-16 A per scale division. The detection efficiency(γ2+ )of MX1° converted into M2+ under a residual gas pressare of 2× 107 Torr was(4.1±2.0)×105, which was determined by a convenient method developed in this work. Consequently, the lower detectable limit of MX1° with another electrometer having the same sensitivity as above was usually about2×107 molecules/sec.0.02 cm2. In this way the emission rates of both M1+ and MX1° could be simultaneously measured as a function of the surface temperature(T1)and the mean sample layer thickness(θ1)on F1 over the ranges of 350-460°C and 103 -1 molecular layers, respectively. The characteristics of F2 as a neutral beam detector were examined under various conditions in order to study the probable sources responsible for the large error in γ2+. Negative ion emission from F1could be detected at T1≥500°C, where 77, was no longer kept constant. The effectiveness of the present instrument and method to investigate the mechanism of thermalion emission from thick alkali halide layers on a metal surface is discussed on the basis of the results obtained in this preliminary experiment.抄録全体を表示PDF形式でダウンロード (1838K) -
猪越 幸雄, 篠崎 善治, 山本 龍夫1974 年 22 巻 4 号 p. 269-273
発行日: 1974/12/31
公開日: 2010/06/28
ジャーナル フリーThe ionmolecule reactions of hydrocarbons, such as isobutene, isobutane and neopentane, have been investigated in the absence and presence of ammonia in the ionization chamber of the mass spectrometer. In isobutene. butyl ions formed by the proton transfer reactions of C2H4+C3H3+, C3H5+and C4H8with iso-butene were decreased and ammoniun ions were produced remarkably when ammonia was added as a proton scavenger. Sec-propyl and-butyl ions formed by the fragmentation of parent ions of isobutane and neopentane, respec tively, were also decreased by addition of ammonia. The rate constant of the proton tran sfer reaction t-C4H9++NH3→C4H8+NH4+was found to be4. 0×10-9cc.molecule-1.sec-1. From these results it is found that ammonia serves as an effective proton scavenger for investigating the role of ionic species in the radiolysis and radiation polymerization reactions.抄録全体を表示PDF形式でダウンロード (525K) -
戸根 弘人, 横内猪 一郎, 馬場 治1974 年 22 巻 4 号 p. 275-280
発行日: 1974/12/31
公開日: 2010/06/28
ジャーナル フリーThe high temperature helium gas loop, which is used for irradiation tests of the nuclear fuels of the gas cooled reactors, is constructed in JAERI(Japan Atomic Energy Research Institute). Since the maximum temperature of the helium gas coolant in the gas loop is1000°, it is necessary that the concentration of impurities present in the helium gas coolant is held less than10ppm to prevent the corrosion of structural materials. To obtain the design data of the helium coolant purification system, the outgassing behavior of the structural materials such as graphite and ceramic thermal insulator was measured by mass spectrometer and gas chromatograph. It is found by this study that the outgassing rate from graphite and ceramic thermal insulator can be expressed by the following equation, s(t)=Ge-ktt2.抄録全体を表示PDF形式でダウンロード (576K) -
KAZUKO OGURA, TAKAHISA HANYA1974 年 22 巻 4 号 p. 281-286
発行日: 1974/12/31
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (468K) -
HOKOTOMO INOUYE, TOSHIAKI SASAKI1974 年 22 巻 4 号 p. 287-290
発行日: 1974/12/31
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (289K) -
HOKOTOMO INOUYE1974 年 22 巻 4 号 p. 291-295
発行日: 1974/12/31
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (325K)
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