巻号一覧
24 巻 (1976)
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24 巻, 1 号
選択された号の論文の12件中1～12を表示しています
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二次イオン質量分析法の基礎と応用に関する諸問題岡野 純1976 年 24 巻 1 号 p. 1-18
発行日: 1976/03/30
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (2226K) -
TAKEKIYO MATSUO, HISASHI MATSUDA, YOSHITAKA FUJITA, HERMANN WOLLNIK1976 年 24 巻 1 号 p. 19-62
発行日: 1976/03/30
公開日: 2010/06/28
ジャーナル フリーA computer program for the calculation of ion trajectory is described. This program“TRIO”(Third Order Ion Optics)is applicable to any ion optical system consisting of drift spaces, cylindrical or toroidal electric sector fields, homogeneous or inhomogeneous magnetic sector fields, magnetic and electrostatic Q-lenses. The influence of the fringing field is taken into consideration. A special device is introduced to the method of matrix multiplication to shorten the calculation time and the required time proves to be about 40 times shorter than the ordinary method as a result. The trajectory calculation is possible to execute with accuracy up to third order. Any one of three dispersion bases, momentum, energy, mass and energy, is possible to be selected. Full LIST of the computer program and an example are given抄録全体を表示PDF形式でダウンロード (3328K) -
小山 保二, 小林 克己, 前田 浩五郎1976 年 24 巻 1 号 p. 63-71
発行日: 1976/03/30
公開日: 2011/03/01
ジャーナル フリーAn analog hybrid computer EAI 180 has been combined to a quadrupole mass filter UTI-KE 100 C to process the ion intensity signals from the mass filter in analog form without changing the signals to digital form. The combination is made only by receiving mass scanning ramp voltage and ion intensity signals from the mass filter. No other procedure is applied to the mass filter system. Mass selection can be made quite arbitrarily on a CRT screen by comparing the scanning voltage to a reference voltage during the usual high speed mass scanning display(100 msec/300 mass). The ion intensity signals are processed in the logic control and peak hold circuits, then the output signals are summed and/or divided in the analog calculation circuits to give a ratio and/or other quantities. Performance tests have proved the combination works quite well and the new system has followed in real time the quick changes of the ion intensity ratios. The system will be capable of being a new tool in the respiratory gas analysis.抄録全体を表示PDF形式でダウンロード (4393K) -
NOBUO TAKAOKA1976 年 24 巻 1 号 p. 73-86
発行日: 1976/03/30
公開日: 2011/03/01
ジャーナル フリーA low-blank, metal system for extracting and purifying rare gases was constructed to connect with a low-background, metal mass spectrometer which had been used in analyses of xenon previously. In melting samples, different two kinds of inner crucibles are employed, which are put in a tantalum crucible to prevent it from destructive attack by sample materials. With the inner crucible of tantalum, blanks are typically 1.4×10-9cm3STP for4He, (1±0.3)×10-11cm3STP for 20Ne, (0.97±0.13)×10-8cm3STP for40Ar, <7×10-13cm3STP for84Kr, and<3×10-13cm3STP for132Xe. With the inner crucible of crystallized alumina, the blanks for 20Ne and40Ar are more by a factor of five on the average than those with the tantalum inner crucible, while the 4He blank is similar to that with the tantalum inner crucible. Most of hindrance ions could be separated from rare gases with a high resolution power(=500)of the spectrometer. To examine the system, rare gases from iron meteorite El Taco were measured. Data of the isotopic analyses of He, Ne and Ar from El Taco are given. The system is suitable for the isotopic analyses of extremely low quantities of rare gases抄録全体を表示PDF形式でダウンロード (1345K) -
ISAO NISHI1976 年 24 巻 1 号 p. 87-95
発行日: 1976/03/30
公開日: 2010/06/28
ジャーナル フリーA new type twin ion source mass spectrometer is being developed with intending to make a simultaneous and continuous measurement of two samples of low mass.The most interesting application will be found in the simultaneous measurement of the respiratory gas and the blood gas. The principal construction of the instrument is a voltage scanning sector type mass spectrometer with two direct gas introduction system(the response of which is higher than50ms in the rise time of 95%)connected to the twin ion sources. The sources are made from one block and the arrangement of which is of side by side. for the easiness of construction. The magnetic field of 180 degree type is modified as to make the two source points and their image lines located just outside the magnet boundary with retaining the two image lines almost superposed and parallel to the boundary.The spacinng between the twin sources is determined as well as the positions of the two collectors so that the ions of the same mass from two sources are simultaneously accepted by the respective.collectors and the beams should not be interfered by other ions from the neighbouring sources at their collector position for all the ions of interest in the respiratory applications.Ions to be detected are selectively scanned by the step-wise potential with the frequency of about 100Hz . After amplified, the ion peaks are separated to the respective channels through analogue switches which are operated associating with the corresponding steps of the scanning potential.The mixing rate of the two samples between the twin sources should be determined so as to take a counterbalance with the clearance response of the ion source: the rate is obtainable as low as 1/200 without any compensation, with retainning the response of 50ms in the rise time of95%.In this paper, the discription of the instrument designed will be presented with some discussions on. several peculiar technical problems.抄録全体を表示PDF形式でダウンロード (1798K) -
ISAO NISHI, SHIGERU SUGAI, KUNIHIKO TANAKA, GIICHI TOMIZAWA1976 年 24 巻 1 号 p. 97-105
発行日: 1976/03/30
公開日: 2010/06/28
ジャーナル フリーThe description of a simple multi-ion monitoring system newly developed for the respiratory mass spectrometer is presented. The system is composed of a selective step-wise scanning supply, a gate assembly which separate the sequential peaks to the respective channels and a timing unit. The central feature of the present system is that the step-wise potential itself and the gate pulses which controls the gate assembly are simultaneously originated from a common six fold ring counter. Each step of the scanning potential is produced by dividing the output of the ring counter by the corresponding series of resisters. The description of the component circuits and the overall performances of the system are presented and discussed with the intention of applying this system to the respiratory works.抄録全体を表示PDF形式でダウンロード (3838K) -
KAZUHIKO KUNO1976 年 24 巻 1 号 p. 107-120
発行日: 1976/03/30
公開日: 2011/07/05
ジャーナル フリーFormation of Ar2+ from long-lived highly excited Ar+* colliding with Ar and N2 gases is studied by means of a tandem mass spectrometer. The tandem mass spectrometer used consists of two mass analyzers connected in series and a collision chamber located in between. The collision chamber is electrically floated and can be set at a desired potential, so that one can identify the fast ions(resulting from the primary ions)and the slow ions(secondary ions)in the mass spectra taken by the second mass analyzer. When the first mass analyzer is tuned to Ar+, peaks corresponding Ar2+ appear in the second mass spectra. From the analysis of variation of mass positions and heights of these peaks with the change of the potential and pressure of the collision chamber, the Ar2+ is concluded to result from the primary Ar+ in collision with gas molecules and wall surface. From the threshold behavior of the product Ar2+ with the electron energy in the ion source, three sets of long-lived highly excited Ar+* states(Rydberg states)are found to be responsible for this process. They are 3s23p4(3P)n1, 3s23p4(1D2)n'1 and 3s23p4(1S0)n″1 converging to Ar2+3P2.1.0(43.38, 43.51, 43.57 eV), 1D2(45.11 eV)and 1So(47.50 eV), respectively. Their fractional ratio in the primary Ar+ beam is determined as 3.0:1.0:1.2 which is close to that of multiplicities of the states concerned. The autoionization mechanism reported by other investigators to be responsible for the formation of Ar2+ in Aston band or tandem mass spectra is found to be negligible. The cross sections of formation of Ar2+ from Ar+ colliding with Ar and N2 increase in proportion to the1.15th power of the collision energy in the range from 750 eV to 2.5 keV. At the collision energy of 1.0 keV, they are 2.0×10-20/Fcm2 for Ar target and 6.6×10-20/Fcm2 for N2 target, where the fractional density of Ar+* is estimated to be0 .7×10-4≤F≤1.5×10-4.抄録全体を表示PDF形式でダウンロード (1202K) -
TADASHI SASAMOTO, HIROSHI HARA, TOSHIYUKI SATA1976 年 24 巻 1 号 p. 121-126
発行日: 1976/03/30
公開日: 2010/06/28
ジャーナル フリーThe relative sensitivity coefficients, SR for alkali, alkali-earth, and transition elements in halides were measured in order to investigate the relationship between SR and the ionization cross section, Q. It was found that Q was a more suitable parameter than ionization potential in the theoretical calculation of SR.抄録全体を表示PDF形式でダウンロード (487K) -
有島 功一, 土屋 正彦1976 年 24 巻 1 号 p. 127-132
発行日: 1976/03/30
公開日: 2011/03/01
ジャーナル フリーFragment ions with excess-kinetic-energy(KE ion)are formed mainly from direct cleavage of highly excited parent molecules. Therefore masss pectrum of KE ions(KE mass spectrum)corresponds well to the structure of a compound. KE mass spectra of about 130 kinds of compounds have been treated with an electric computer system. The characteristic peaks and peak groups(named Key Mass)which indicate the presence and/or absence of some fragment group(substructure, e.g. -CH2OH, -C2H5, CH3CO-)were selected by judging from the relative intensities of various ion peaks related various substructures. The relative intensities of Key Mass(named Key Mass Value)of a sample compound are compared with their standard values calculated above. Further treatments of these values have been done to obtain the final information about a substructure. It indicates the usefulness of KE mass spectrum for computer identificatlon.抄録全体を表示PDF形式でダウンロード (596K) -
SHIGERU YAMASHITA1976 年 24 巻 1 号 p. 133-137
発行日: 1976/03/30
公開日: 2010/06/28
ジャーナル フリーA mass spectrometric method has been studied for the determination of primary process in photochemical reactions, High intensity output of the mercury lamp is focused on the molecular flow of reactant gas introduced in the ion source of a mass spectrometer. The recorded mass spectrum of the photolyte flow is the superposition of the mass spectra of photofragment free radicals and unreacted reactant molecuies. Providing that the mass spectra of the photofragment free radicals produced in the reaction system have been known in preliminary experiments, the primary processes in photochemical reactions may be determined directly. In the primary process of azoisopropane photolysis, exemplified for the description of photofragment mass spectrometry, the rupture of C-N bond in azo-isopropane has been found predominant, which is consistent with the results of previous works carried out by other method.抄録全体を表示PDF形式でダウンロード (447K) -
岩永 政也, 細井 淳, 亀島 紀夫, 大西 正三1976 年 24 巻 1 号 p. 139-147
発行日: 1976/03/30
公開日: 2011/03/01
ジャーナル フリーThe construction and performances of a dual EI/CI ion source designed for the Shimadzu GCMS-9000 are described. Some design considerations on the construction of the combined gaschromatograph-EI/CI mass spectrometer are also described. Among various operating parameters for chemical ionization, ion source temperature has noticeable effects on CI spectra. Several measurements on temperature effect were carried out. As CI spectra are generally simpler and have greater abundance of quasi molecular ion than EI spectra, it is favourable to detect trace amount of sample with mass frag-mentography technique. Typical example which will show the minimum detectable amount is also shown. It is possible with this source to measure various mass spectra such as EI, CI, CE and combined CE/CI spectra of the same sample. Examples of such spectra data are presented.抄録全体を表示PDF形式でダウンロード (2642K) -
NAOKI KATO, NOBUO KOBAYASHI, YOZABURO KANEKO1976 年 24 巻 1 号 p. 149-152
発行日: 1976/03/30
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (240K)
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