軌道分離・非磁場型質量分析計の試作

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A new mass spectrometer of non-magnetic type which was proposed previously by the author (ref. 1), was examined experimentally. One of the anticipation in the preceding article is that the resolving power of the mass spectrometer increases in proportion to the transit time of the detecting ions in the rf field. To confirm this property experimentally, two types of the mass spectrometer tube were prepared. The first tube was prepared to examine the property that the resolving power is proportional to the recoiling number N of the motion of ions. The case of N=1 to 3 was studied with a demountable ion collector. The other test tube (N=2) was designed to have the large electrode gap of d2 (>d1). With the second tube, a factor of 1.5 increase in the resolving power over the conventional tube (d1=d2) will be obtained. The resolving power obtained with two types of the mass spectrometer showed good agreement with theoretically estimated values, respectively.This mass spectrometer is able to operate with frequency sweep method, and the relative transmission probability (relative ion current vs. mass to charge ratio) will be independent of the ions mass. The result obtained showed constant ion transmission probability in the mass range larger than m/z=40, but it was decreased in the smaller mass range. The reduction is caused by the large rise time of the rf pulse used here. It was also confirmed experimentally that the resolving power does not be affected by the velocity distribution of beam ions.
日本質量分析学会の論文

軌道分離・非磁場型質量分析計の試作

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