| 摘要 |
An ion mirror 10 for use in a time of flight mass spectrometer 100 comprises a first 5 electrode 20 for producing a quadratic field along a first axis 80, and a second electrode 30 for producing a quadratic field along a second axis 90, the axes 80, 90 being orthogonal. Alternatively, a series of discrete parallel plane electrodes may be used to generate the necessary hyperbolic field. Ions incident on a slit in a grounded entrance plate are reflected by the potential field and exit either through another slit or the same slit (figure 3). An alternating voltage is applied to the electrodes that increase the path length of ions in the reflector and thereby increases the resolution of the spectrometer without increasing its size. An ion trap comprising magnetic field confinement arrangement at either end of a quadropole electrode arrangement is also disclosed (figures 11-13). |
