Abstract
Ion optical investigation on high performance mass spectrometer is described. The field arrangement QQQOHQCQ (Q: Quadrupole, O: Octapole, H: Homogeneous magnetic sector, C: Cylindrical electric sector) is suitable for the design of mass spectrometers with ultra high resolution (AF=926,000) and with very large mass dispersion (C/AM=4). A zoom mass spectrometer is proposed by adjusting only the applied electric potentials to three quadrupoles without changing geometrical configuration. The image magnification can be changed from 0.046 to 0.187 continuously keeping small image aberrations. Very small size and high performance mass spectrometer is available by using double sector magnet. The correction of image aberrations by hexapole is discussed.
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