Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
ISSN-L : 1340-8097
29 巻, 1 号
選択された号の論文の7件中1~7を表示しています
報文
  • 藤井 康夫, 兼松 太
    1981 年 29 巻 1 号 p. 51-60
    発行日: 1981年
    公開日: 2007/05/01
    ジャーナル フリー
    Studies on the Venetian blind type electron multiplier (VBEM) were carried out by the investigations of the potential distribution and the electron trajectory and further by the experiment for the three multipliers having different dynode piece, intervals. As the dynode piece, Cu-Be (2%) sheet was used.
    By using appropriately wide piece interval, good multiplication efficiency was obtained at relatively small applied voltage.
    On the basis of these preliminary studies, 12-stage and 16-stage multipliers were constructed. The gain of the former multiplier was about 1.3 × 105 at 3 KV applied voltage and that of the latter about 2 × 106 at 4 KV. The 12-stage VBEM was used in an R. F. mass spectrometer and retarding field energy analyzer, and the results showed that the VBEM had a good performance characteristics.
  • Ken-ichi Kanazawa, Seiji Tsurubuchi, Tatsuo Arikawa
    1981 年 29 巻 1 号 p. 61-66
    発行日: 1981年
    公開日: 2007/05/01
    ジャーナル フリー
    The limitation of an angular measurement of scattered ions with the use of the “perfectron” has been investigated by means of a computer simulation for a collision energy of ions from 10 eV down to a thermal energy. It turns out that there exsists a certain angular region through which the ions of interest can not be detected in the shade of the detector itself, if a detector of finite geometrical diameter is employed. On the measurement of angular distribution, such a dead angular region is undesirable and should be made as small as possible. However, the computer simulation shows that the effect of this dead angular region is not so serious for energies of usual collison experiments so far as the diameter of the detector is not too large. The minimum permissible energy, above which the exact angular distribution can be measured, is estimated as 10 meV for He+ ions when the detector of 2 mm in diameter is employed.
  • 伊藤 満, 笹本 忠, 佐多 敏之
    1981 年 29 巻 1 号 p. 67-73
    発行日: 1981年
    公開日: 2007/05/01
    ジャーナル フリー
    The ionization cross section of Na2Cl2, NaKCl2, K2Cl2, and KCl have been measured relative to that of NaCl assuming constant relative multiplier gains and utilizing the transpiration-measurement data which have given the accurate amounts of Na- or K- bearing species in an equilibrium vapor phase over the molten salt NaCl-KCl, and obtained the following values; 1.19, 1.30, 1.60, and 1.07, respectively.
  • 山本 雅弘, Henry P. Schwarcz
    1981 年 29 巻 1 号 p. 75-79
    発行日: 1981年
    公開日: 2007/05/01
    ジャーナル フリー
    A bromine pentafluoride line was built for water samples after O'Neil and Epstein (1966). The line is used to decompose water to produce oxygen gas by reacting with bromine pentafluoride and subsequently to convert the oxygen gas to carbon dioxide gas for oxygen isotope analysis. It was applied to water samples from fluid inclusions in speleothems. Water was extracted from speleothems by crushing them in a stainless steel tube in a manner initially developed by Roedder et al. (1963).
    The precisions of the bromine pentafluoride line for standard water samples, VSMOW and NBS-1, were ±0.15 and ±0.20‰, respectively. The precision for the whole analytical procedure including the step of crushing speleothems was checked using natural flowstone samples from Bermuda and was found to be ±0.24‰.
  • 田村 一二三, 石谷 亨, 泉 栄一
    1981 年 29 巻 1 号 p. 81-87
    発行日: 1981年
    公開日: 2007/05/01
    ジャーナル フリー
    A thermodynamic approach to quantitative analysis proposed by Andersen was applied to NBS standard reference material Orchard Leaves. The electrical charge accumu lated at the sample surface under the primary ion bombardment was neutralized with the method which utilizes effectively secondary electrons as described in the previous paper. In order to decrease the contributions of the organic molecular ions and their fragment ions to the peaks of elemental ions, the analysis was performed by using high power density primary ion beam. Agreement of the quantitative analytical values with the chemical analysis was satisfactory as well as the case of the metal analysis.
  • 化学イオン化法による5-(4'-chloro-n-butyl)-picolinic acid の血中濃度測定
    吉住 秀夫, 立松 みどり, 立松 晃, 鈴木 真言, 坂本 信夫, 佐藤 祐造, 湊川 文子, 宮崎 浩
    1981 年 29 巻 1 号 p. 89-96
    発行日: 1981年
    公開日: 2007/05/01
    ジャーナル フリー
    A fundamental study was performed to establish a method of quantitative analysis by mass chromatography using direct inlet system in chemical ionization mass spectrometry. The samples of human serum which were obtained by venipuncture from healthy man volunteer treated orally with 5-(4'-chloro-n-butyl)-picolinic acid (CBPA). CBPA-d5 was used as internal standard. Direct probe-mass chromatography was performed by an on-line system of the Shimadzu LKB-9000 B and the GC-MSPAC 300. It can be concluded that this method is applicable to the quantitative determination of medicines in biological fluids.
  • 謝 博進, 松原 義治
    1981 年 29 巻 1 号 p. 97-111
    発行日: 1981年
    公開日: 2007/05/01
    ジャーナル フリー
    The mass spectra of 55 sesquiterpenoids containing 14 novel compounds were measured by gas chromatography-mass spectrometer (EI method at 70 eV), in which 15, 11, 10, 10, 4 and 5 compounds were classified such as longifolanes, caryophyllanes, cadinanes, cedranes, longipinanes and thujopsanes, respectively. Their spectra were studied systematically upon the relation of sesquiterpene skeleton and characteristic peaks of each skeleton were researched.
    On the result, common ions of m/z 109, 121, 135 and 161 were found in the mass spectra of longifolanes; common ions of m/z 119, 133, 161 and 177 were done in the mass spectra of caryophyllanes; common ions of m/z 121, 133, 147 and 161 were done in the mass spectra of cadinanes; common ions of m/z 95, 107, 135 and 147 were done in the mass spectra of cedranes; common ions of m/z 119, 133, 134 and 135 were done in the mass spectra of longipinanes and common ions of m/z 107, 121, 135 and 147 were done in the mass spectra of thujopsanes.
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