巻号一覧
21 巻 (1973)
- 4 号 p. 263-
- 3 号 p. 203-
- 2 号 p. 117-
- 1 号 p. 1-
21 巻, 2 号
選択された号の論文の10件中1～10を表示しています
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KUMASABURO KODERA1973 年 21 巻 2 号 p. 117-126
発行日: 1973/06/30
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (1054K) -
広瀬 博, 津山 斉, 奥平 定之, 伊藤 倫康1973 年 21 巻 2 号 p. 127-139
発行日: 1973/06/30
公開日: 2011/07/05
ジャーナル フリーA Hitachi RMU-6D mass spectrometer has been modified to permit chemical ionization studies. A new source pumping system gives a pumping speed of 700 l/sec at the source and of 120 l/sec at the analyzer tube. A new ionization chamber has an electron entrance slit of 0.05mm × 3 mm and an ion exit aperture of 0.4 mm∅. A reaction gas(CH4)was introduced into the ionization chamber of the mass spectrometer at pressure of 1.2 Torr. In this condition a pressure ratio of 6×104 to 1 could be maintained between the ionization chamber and the analyzer tube by means of differential pumping. A high sensitivi ty in the chemical ionization mode has been obtained at the electron accelerating voltage of 108 eV. We have studied various secondary ions formed in methane at elevated pressures and have observed that ion currents of the major secondary ions increase linearly to the pressure, and depend on the ele ctron accelerating voltage and ion repeller voltage. The stabilities of the reactant ion current and fragment ion current are 2% and 5.6%, respectively, Several compounds(2, 2, 5-trimethyl hexane, 2-propanol, n-amyl alcohol, 4-methyl hexanol)have been used as sample gases. CI spectra of alcohols consist of an intense ion peak with m/e=[(M±1)-18]+which will be the quasi-molecular ion for alcohols.抄録全体を表示PDF形式でダウンロード (8613K) -
山内 悦雄1973 年 21 巻 2 号 p. 141-147
発行日: 1973/06/30
公開日: 2010/06/28
ジャーナル フリーThe design and construction of a chemical ionization source for the JMS-D100 mass spectro meter are described. The source, equipped with a high speed pumping system, is desi gned to operate at ionization chamber pressures up to 5 Torr with the pressure of the ion source kept below 5×10-4 Torr. In order to ascertain the performance of this source, the chemical ionization spectra of isopropanol and tri-n-butylamine have been measured with methane and hydrogen as reactant gases. The variation of the ion intensities with ion repeller voltage is also described.抄録全体を表示PDF形式でダウンロード (500K) -
前田 浩五郎, 永瀬 勝弘, 小山 保二, 鈴木 功1973 年 21 巻 2 号 p. 149-158
発行日: 1973/06/30
公開日: 2010/06/28
ジャーナル フリーIn measuring the ionization efficiency curve by electron bombardment, mass analyzed ion counts have to be accumulated for successive values with a fixed interval of electron energy. For this purpose, a step voltage source for the electron acceleration was designed and constructed which can syndlronize the advancing of memory channels in a pulse height analyzer. The syncbronization and correspondence of theaccelerating voltages to the PHA channels were kept by generating a series of logic pulses in a time sequence. The pulses were generated and controlled by using a net wrok of about 30 digital IC's and 7 linear IC's. Performance tests have proved that the correspondence between the voltages and the channels is certainly kept and the combination. of the voltage source and the PHA system does work well with good accuracy in wide ranges of step times(0.1-50sec)and step voltages(0.01-0.5eV) .抄録全体を表示PDF形式でダウンロード (2058K) -
三宅 寛1973 年 21 巻 2 号 p. 159-169
発行日: 1973/06/30
公開日: 2011/03/01
ジャーナル フリーPulse height distributions of the output of a secondary electron multiplier for various kinds of ions in the keV region were measured and analyzed to determine the true detection efficiencies for these ions. A high sensitivity mass spectrometer was used for the measurement at residual gas pressures around 10-9 Torr. An Allen-type secondary electron multiplier of 12-stage Cu-Be dynodes connected to a low-noise charge-sensitive preamplifier was used for detecting keV ions. It is assumed in the analysis that the pulse height distribution can be obtained from Polya statistics. The pulse height distributions for the ions of which secondary electron yields were markedly different made it possible to estimate the pulse height distribution for the single electron emitted from the conversion dynode. It was made clear that the statistics of the secondary electron emission by the light ions, e. g. H+, H2+ and He+, was different from that by the heavy ions, e. g. Ar+, CO+ and CO2+.抄録全体を表示PDF形式でダウンロード (2219K) -
TATSUO ARIKAWA1973 年 21 巻 2 号 p. 171-177
発行日: 1973/06/30
公開日: 2011/07/05
ジャーナル フリーDifferential scattering of He+ ions by He atoms in the energy range of 10 to 100 eV over the scattering angle from 2° to 20° has been measured using the crossed beam apparatus. Prominent oscillatory structures in the differential cross section resulting from the interference between waves scattered from the lowest gerade 2Σg+ and ungerade 2Σu+ states of a pseudo-molecular ion He2+ were observed. The rainbow peak due to the elastic scattering of He+ by He was observed superimposingly upon these oscillatory structures due to the resonant electron capture. The relative differential cross sections were normalized to the absolute data of Lorents and Aberth.抄録全体を表示PDF形式でダウンロード (632K) -
GUNZO IZAWA, KAZUO NAGASHIMA, MASAYUKI HIRAGA, KENJI YOSHIHARA, TAKANO ...1973 年 21 巻 2 号 p. 179-186
発行日: 1973/06/30
公開日: 2011/03/01
ジャーナル フリーUsing the Tohoku Charge Spectrometer the presence of the parent ion and its hydrogen-deficient species was elucidated in the isomeric transition of D80mBr, H80mBr and C2H580mBr. Similar phenomena were also observed in the β-decay of CH3131 I and CH3126I. These experimental results were compared with those by X-ray irradiation and charge exchange reactions with positive ions, and were discussed in connection with the explosion model proposed by Carlson et al.抄録全体を表示PDF形式でダウンロード (706K) -
佐藤 均, 朝倉 祥郎, 鏡 和臣, 鎌田 正行1973 年 21 巻 2 号 p. 187-193
発行日: 1973/06/30
公開日: 2011/03/01
ジャーナル フリーThis paper describes a mini-computersystem specifically designed for a surface ionization instrument capable of precise isotopic abundance measurements of uranium and phtonium. The mini-computer system has two major functions; it is possible to reduce the analytical hour and personal errors in measuring the peak height with tools. The system consists of five parts; Analog-Digital-Converter(A. D. C), mini-computer(4 k), teletype, and two mass spectrometers. The data consisted of the A. D. C. voltage level from a vibrating reed electrometer which was connected to the ion beam detector within a mass spectrometer. The voltage level was converted to a digital form by means of a voltage-to-frequency converter(VTFC)and a number of four figure scalers. This out-put was fed into a scdler gated for a predetermined time. The counts in the scaler were then proportional to the voltage level for any given gate time and were read directly into the computer. The gate time for counting the frequency was 0.4 sec and was controlled by the computer. To reduce the measuring error due to noise, the computer calculated the average of three values of before and behind of the actual highest value for the highest value of a peak. When the period between the times measured for the starting value(i. e. the differential value of the frequency of VTFC which changed from zero to plus), and the end value(i. e. the differential value of the frequency of VTFC which changed from minus to zero)of a peak was shorter than the established one, the computer did not detect it as a peak.抄録全体を表示PDF形式でダウンロード (657K) -
SHIN-ICHI SASAKI, HIDETSUGU ABE, MINORU SUZUKI, YUKIO SAKURABA, MIKI O ...1973 年 21 巻 2 号 p. 195-198
発行日: 1973/06/30
公開日: 2010/06/28
ジャーナル フリーThe mass spectra of sixteen compounds belonging to phenyltetralols and phenylchromanols were measured. The fragmentation pathways and the behavior of water elimination of these compounds upon electron impact were described.抄録全体を表示PDF形式でダウンロード (241K) -
KAZUSHIGE NISHIZAWA, KAORU NARISADA, HIDENORI TERAMATSU, HIROSHI IWAMI ...1973 年 21 巻 2 号 p. 199-201
発行日: 1973/06/30
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (255K)
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