試作四重極質量分析計の感度と分解能

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Sensitivity 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 N<SUB>2</SUB><SUP>+</SUP> 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.
日本質量分析学会の論文