巻号一覧
41 巻 (1993)
- 6 号 p. 297-
- 5 号 p. 253-
- 4 号 p. 191-
- 3 号 p. 159-
- 2 号 p. 73-
- 1 号 p. 5-
41 巻, 5 号
選択された号の論文の3件中1～3を表示しています
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総説
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有澤 孝, 若井田 育夫, 赤岡 克昭, 宮部 昌文, 大場 正規1993 年 41 巻 5 号 p. 253-276
発行日: 1993年
公開日: 2007/07/20
ジャーナル フリーMultistep photoionization process is discussed concerning the Atomic Vapor Laser Isotope Separation applied to isotopes of heavy elements which has been carried out at Japan Atomic Energy Research Institute these 6 years. We present the studies related to the collection of basic spectroscopic data, selection of the most effective stepwise ionization, photodynamical characterization, excitation of hyperfine structure and laser beam propagation in absorbing medium. Techniques to determine the optical properties using stepwise photoionization, optimization techniques to find the most effective combination of laser wavelengths are also presented.抄録全体を表示PDF形式でダウンロード (1843K)
報文
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Masao YAMAMOTO, Motoko TANAKA, Yoshiko YOKOTA, Takae TAKEUCHI1993 年 41 巻 5 号 p. 277-286
発行日: 1993年
公開日: 2007/07/20
ジャーナル フリーThe fragmentation of 1,1,2,2-tetramethyldisilane by using a deuterium labeling technique, a B/E linked scanning technique and ab initio MO methods was studied. In 70eV-EIMS the base peak was observed at m/z 59, which is produced by the simple cleavage of an Si-Si bond. It was confirmed by the ab initio MO calculation that the formation of this ion might occur predominantly. It was concluded that the abundant ion at m/z 73 was produced by a 1,2-hydrogen shift from one silicon atom to the other with simultaneous reverse shift of a methyl group.抄録全体を表示PDF形式でダウンロード (555K) -
Atsumu HIRABAYASHI, Minoru SAKAIRI, Yasuaki TAKADA1993 年 41 巻 5 号 p. 287-294
発行日: 1993年
公開日: 2007/07/20
ジャーナル フリーIons produced in atmospheric pressure spray (APS) ionization from aqueous solutions of sucrose and alanine are detected with a quadrupole mass spectrometer. The S/N ratios for their mass spectra are analyzed to study the evaporation of charged droplets, since they are detected as random noises. Two kinds of heated sampling orifices with thicknesses of 0.5 and 12.5 mm are compared. Higher ratios are obtained with the thicker one. The solution concentration dependence of the relative intensity of the cationized sucrose molecule suggests that ion evaporation does not take place in the sampling orifice and that the charged droplets produced by adiabatic expansion are suppressed by heating the vaporized solution. At the optimized pressures in the intermediate-pressure regions, 65 fmol of sucrose is detected. However, the noise level is still determined by detecting charged droplets, which are likely to be produced by the spray in the atmospheric-pressure region.抄録全体を表示PDF形式でダウンロード (566K)
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