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Volume 23 (1975)
- Issue 4 Pages 237-
- Issue 3 Pages 161-
- Issue 2 Pages 105-
- Issue 1 Pages 1-
Volume 23, Issue 4
Displaying 1-8 of 8 articles from this issue
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JUN OKANO1975 Volume 23 Issue 4 Pages 237-245
Published: January 30, 1976
Released on J-STAGE: March 01, 2011
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ITSUO KATAKUSE, HIROMITSU NAKABUSHI, KOREICHI OGATA1975 Volume 23 Issue 4 Pages 247-269
Published: January 30, 1976
Released on J-STAGE: July 05, 2011
JOURNAL FREE ACCESSWith the intention to determine the atomic masses in the accuracy up to the order of magnitude of 10-9, in 1967 we were planning to construct a new large tandem type mass spectroscope. The machine consists of two sets of first order double focusing mass analyzer. The first stage of the machine has a cylindrical electric field and a uniform magnetic field. The radii and the angles of these fields are 310 cm, 73.8° and 260 cm, 106.2° respectively. In the second stage, a uniform magnetic field is followed by a cylindrical electric one and the radius and the angle of the former field are 110 cm, 100° and those of the latter 310 cm, 80°. The two sets of analyzers are connected in inverse S-shape and an intermediate double focus-point is located between them. The total ion path length is about 37 m. The calculated mass dispersion for 1% mass difference is about 35 cm and the resolution is calculated to be about 9.2×106 with 1μ m main slit width. Till late spring of 1969, the machining work of the main parts of the machine was finished. Then the preliminary setting work was begun and in the middle of 1972 we succeeded in catching the first ion beam at the final focus-point. The mass dispersion at that time could be estimated to be nearly the expected value. However, the aspect of ion beam convergency was extremely far from the expected one. After several trials for focus adjustment of the machine as a whole, it was found that such work was seriously difficult in the preliminary stage of the adjustment. So, since 1973, we had been earring out the focus adjustment by using on the first stage analyzer at the intermediate focus-point. After rather long investigations, it was found that the focusing properties depended critically on the location of ion beam in the magnetic field. Recently the focus adjustment work was finished and in the best condition the resolution of 800, 000 or somewhat better could be attained. Following to the above focus adjustment work, the doublet mass difference measurements were begun by the digital peak matching method at mass 28 and 36. And some atomic masses were calculated from the doublet mass differences. The results obtained are as follows: 7, 825.050±35 μu, D=14, 101. 912±67μu, N=3, 074.075±115μu and O=-5, 085.281±307 μu.View full abstractDownload PDF (9460K) -
YOSHIAKI KATO, YOSHIO TAJIMA, HAJIME HAYAKAWA, ATSUSHI SHIBATA, KOUJI ...1975 Volume 23 Issue 4 Pages 271-279
Published: January 30, 1976
Released on J-STAGE: July 05, 2011
JOURNAL FREE ACCESSAn on-line real time data processing system for the ion microanalyzer was developed. The system performs continuous data acquisition, data reduction to the mass densitogram(like mass chromatogram)as well as mass spectral data at will. The system is composed of an8kW(16bits)HITAC-10II minicomputer, a65kW magnetic drum, a Tektronix613cathode ray tube(storage type), a digital plotter and a newly designed interface which enables the programmed control of specimen stage drive, magnetic field strength and others. Discrete mass scanning is carried out stepwise by the use of a precise mass marker. We developed a new technique to eliminate the crater effect for the in-depth analysis. The system controls the primary ion beam scanning on the specimen surface and counts the number of secondary ions sputtered from the limited area. Mass spectral data are stored on the magnetic drum in the real time fashion. Data thus obtained are displayed on the CRT and the plotter, independently of acquisition, in several ways:analog spectrum, mass densitogram, bargraph and mass-intensity table.View full abstractDownload PDF (911K) -
TOSHIHIRO FUJII1975 Volume 23 Issue 4 Pages 281-290
Published: January 30, 1976
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSSensitivity and resolution were studied in a newly developed quadrupole massfiter. series of experiments was undertaken to discuss the factors which limit them. Sensitivity of0. 18mA/Torr mA at a resolution of56was obtained for N2+ ion with an emission current of1mA, when the ratio of transversed ions in the analyser to collimated was estimated to34%(resolution is defined as m/Δm, whereΔm is measured at half-height of the peak). The relative intensity through a mass range(69-605)was investigated. The resolution of1260was obtained at m/e=605with an ion energy of10eV. The maximum resolution has been found to depend on the ion energy. Reso lution has been found to depend on the ion energy. By the introduction of RF cycle numbers, relation was discussed and compared with von Zahn's approximation. The experi mental results suggested the dimensional accuracy was important. Mechanical alignments should be done with a great care. Particularly an angle and a displacement between ion source and quadrupoles were critical for high performance.View full abstractDownload PDF (860K) -
Chlorobenzene DerivativesHIROSHI SAKURAI, AKIRA TATEMATSU, HISAO NAKATA1975 Volume 23 Issue 4 Pages 291-298
Published: January 30, 1976
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSThe 2E doubly charged ion mass spectra of several chlorobenzene derivatives(R-C6H4-Cl) were recorded. For most compounds, the[M-HCl]peak was observed together with CmH-R and CnH2 peaks. It is shown that the 2E spectrum can be used for the discrimination of isomers, which was exemplified by the case of chlorobenzaldehyde.View full abstractDownload PDF (534K) -
HIROSHI ICHIKAWA, MICHIHIKO OGATA1975 Volume 23 Issue 4 Pages 299-309
Published: January 30, 1976
Released on J-STAGE: July 05, 2011
JOURNAL FREE ACCESSThe relative bond energies of the ethylamine ion and the potential energy curves of its dissociation were calculated by the unrestricted MINDO/2 method in attempt to explain the specific cleavage of the ion . Simple cleavage reactions of doublet ion were generally classified into two groups of reaction according to the formal movement of the unpaired electron in the reaction. It was revieled that the reactions so-called α-cleavage orβ-bond cleavage belong to a group of reaction in which a strong interstate interaction inevitablly appears in the course of reaction causing lower transition energy. A qualitative interpretation was given for the relationship between the net charge density of the highest occupied molecular orbital and the scission probabilities. The validity of the Bell-Evans-Polanyi principle in mass spectral reaction was discussed.View full abstractDownload PDF (1109K) -
HIROHIKO EZOE, YOSHIKO ITOH1975 Volume 23 Issue 4 Pages 311-313
Published: January 30, 1976
Released on J-STAGE: July 05, 2011
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MICHI ARATANI, KAZUMITSU NAKAMURA, NOBUFUSA SAITO1975 Volume 23 Issue 4 Pages 315-316
Published: January 30, 1976
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSDownload PDF (147K)
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