Magnetic field used in usual mass spectrometers is of so-called sector or Nier type with straight boundaries. In this paper, a circular magnetic field, which was originated by Bainbridge and has hitherto been disregarded, is taken up to apply it to multi-dispertion system with ion mirrors, simplifying the construction and adjustment of the spectrometer. Analysis of ion trajectory in this magnetic field is given.
In a symmetrical circular magnetic field, spherical aberration by a right angle deflection of ion beam becomes 4Rα³ where 2α is the aperture angle of the ion beam at its source and R the radius of trajectory. Rα² being the spherical aberration in a symmetrical sector field, the advantage of the circular field over the sector field is obvious; a significant improvement upon resolving power and sensitivity of mass spectrometer is therefore expected. by the use of circular magnetic field. Introducing the concept of “index of performance”, the author estimates the increase of the index at approximately 100% under ordinary working conditions.
On the assumption that, in double-dispersion system-the simplest case of multi-dispersion system-with one magnetic field and one ion mirror, the ion beam to the mirror and that reflected from the are correctly on the same route, dispersion distance and the beam width at the collector are evaluated.
Generally, chromatic and spherical aberrations increase in proportion to dispersion; in double dispersion system, they become roughly twice of those in single dispersion system while the width of the image of ion souce slit remains the same as that of the slit. Therefore, the resolving power now defind as the ratio of dispersion distance to twice of beam width, which is different from customarily accepted interpretation, do increase.
Especially, the third-order spherical aberration, as well as the second-order aberration, vanishes in a circular field by a right angle deflection, and the resolving power becomes independent of the aperture angle of ion beam at its source. This means that the sensitivity of a mass spectrometer can be increased at will without lowering the resolving power.

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研究の目的自閉症傾向のみられる発達障害児を対象に、刺激等価性の枠組みを用いて、5種の感情(うれしい・たのしい・かなしい・おこる・こわい)に関わる言語行動を効率的に指導できるかどうか検討した。研究計画「おこる」「こわい」を第1刺激クラスセット、「うれしい」「たのしい」「かなしい」を第2刺激クラスセットとして、刺激クラスセット間の多層プローブデザインを適用した。場面小学校の教室で授業時間および放課後を使って指導を実施した。参加者障害児学級に在籍する、自閉症の傾向を持った2名の9歳男児が参加した。介入各感情に対応する状況文を提示して「どんな気持ち?」と質問し、感情語で回答させ、正答を言語称賛により強化した。行動の指標感情語報告の正反応率に加え、感情語、状況文、表情画間の等価関係を指導の前後で測定した。結果訓練による感情語報告の正反応率の上昇、新奇の状況文を使った般化課題における正反応率の上昇、刺激等価性テスト課題の正反応率の上昇が見られた。結論刺激等価性の枠組みを用いることによって、感情語の指導を効率的に進められる可能性が示された。

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