Ion optical properties of the sector type fields which diverge ion beam (diverging field) and of those which have no lens action but have dispersive action (dispersing field) are discussed. If the magnetic field is expressed as H_z=H_orⁿ and electric field as E_r=E_or^l approximately, then the field with n<-1 or l<-3 is diverging field, and that with n=-1 or l =-3 is dispersing field.
Diverging field forms the virtual image and the dispersion at the virtual image is given by(a/k²) (X-1)δ', where a is the mean radius, k²=-(n+1)or-(l+3), X the magnification and δ'=γ+β (magnetic field) or γ+2β (electric field) .(γ and β are fractions of mass and velocity respectively.) A very small single focus mass spectrometer is proposed by combining 60° magnetic diverging field (k=1) and electric quadrupole lens in tandem, and a very small double focus mass spectrometer is designed by the combination of the 60 ° electric diverging field (k=1) and the 60 ° uniform magnetic field. These mass spectrometers are about one half in size compared with the ordinary mass spectrometers with the same resolving power.
The dispersive action of the dispersing field is analogous to the optical prism. The dispersion angle is given by Φδ', where Φ is the deflection angle of the field, and is independent of the radius. When the ordinary sector type analyzer is separated in two at the point where ion beam becomes parallel and the dispersing field is inserted between them, the total dispersion and resolving power is increased several times but the total size of the apparatus does not become so large. For example, when 315 ° dispersing magnetic field is inserted between 30°-30° uniform magnetic fields, both dispersion and resolving power are increased about 6.5 times as large as those of the 60° uniform magnetic field of the same radius.
Double focusing mass spectrograph with the resolving power of the order of 10⁷ is designed by using the above principle. This apparatus consists of toroidal electric field, γ^-1magnetic field and uniform magnetic field and the total ion path is less than 10 m.
The ion orbit in the above fields is also calculated in the second order approximation.

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A mass spectrometer for photo-ionization by vacuum ultra-violet light and for microanalysis by static operation was constructed in University of Osaka Prefecture. The analyser tube and ion source can be baked out up to about 400° and 300°C, respectively. The other parts of the mass spectrometer can be baked out at about 130°C. By total 250 hours' baking out and evacuation end vacuum reached to 2×10^-9 mmHg, and almost no background peak was detected under dynamic operation by an usual type d. c. amplifier. When static operations were carried out under these experimental conditions, main residual gases of hydrogen, methane and carbon monoxide increased for the duration of static operation. The evacuation rates by the Bayard-Alpert type ionization gauge were measured for hydrogen, methane, carbon monoxide, carbon dioxide, argon, neon and helium. The results indicate that the evacuation rates of hydrogen and methane by the Bayard-Alpert type ionization gauge are considerably large, and that the evacuation rates of noble gases have correlation to their ionization probabilities. The sensitivities in item of A/μcc NTP of noble gases for analysis by static operation were measured, and the results show that the sensitivities(A/μcc NTP)of ⁴⁰ Ar, ²⁰Ne and ⁴He are 6.39×10^-13, 1.26×10^-13 and 6.92×10^-14, respectively. Further measurements using a Cu-Be twelve-stage secondary electron multiplier have been continued.

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Digitization of mass spectra has been carried out with the maximum peak height holder and a conventional digital voltmeter. The operation of the holding circuit was described in detail. Then storage tube type mass spectrometer recorder was described briefly.

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Isotopic abundances of xenon and krypton extracted from four kinds of uranium minerals were measured with a high sensitivity mass spectrometer. Experimental procedures of the extraction and the purification were described. The mass spectrometric analysis was carried out under static operations using xenon and krypton samples of 10-10-10-7 cc STP. In order to obtain the relative yields of xenon and krypton isotopes in U238spontan eous fission, the observed patterns were corrected for the neutron fission components and for the normal gas components. The spontaneous fission product patterns of xenon isotopes obtained from the pitchblendes(U: 35-70%)were in good agreement with that reported by Young and Thode. But the pattern obtained from the kobe-ite sample(U: 4.6%)differed to some extent from those. Conceivable reasons for this discrepancy were discussed.

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The values of single-stage separation factor for the boron isotope exchange between boron fluoride gas and its weak complexes that are stable only at low temperatures are determined by means of the shaking-type gas-liquid contactor and mass spectrometer.

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Within recent years the stable isotope ratio has become one of widely used tools of the geochemistry. The method is based on the measurement of the mass-spectrometory. On the geochemical study, one of the most important problem is the standard or reference samples which are compared among the different researchers. There has not been general agreement in the field concerning the standard or reference samples on the various laboratories except a few elements. The work described in this report was initiated on behalf of the geochemist who has been used the stable isotope.

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The thiophenic sulfur compounds in poly-aromatic fraction of Kuwait gas oil were analyzed by low voltage ionization method. The sulfur compounds which have the same mass number series with the aromatic hydrocarbons in the spectrum of low voltage ionization were separated by liquid chromatography and which could not be separated completely from the aromatic hydrocarbons were analyzed by distribution curve method. It became evident that this method is useful for the analysis of sulfur compounds under coexsistence of hydrocarbons. The abundance order of the thiophenic sulfur compounds were benzothiophenes, dibenzothiophenes, 2, 3 dihydro-benzothiophenes and tetra-hydro-di-benzothiophenes. The thiophenes were accounted as the biphenyls and their abundance is considered to be very small in gas oil fraction. The carbon number of alkyl side chain on the most abundant molecules of above four compound types were 6, 4, 5 and 3 respectively.

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