抄録
A new design of TOF mass spectrometer with helical orbit is described. Six 60° cylindrical electric sector fields are arranged in a circular shape with six free spaces of length RE. At one free space, after one turn of ions through electric sectors, a parallel shift of ion trajectory is obtained in the y-direction (parallel to the axis of helical ion orbit) by a pair of parallel plate condensers which generate deflection fields in opposite directions. Then ions are injected into the lower orbit of electric sector. Helical orbit of many turns is realized by successive parallel shift. In this way, very long ion path length is obtained in a small geometrical space. Excellent focussing nature is attained in both time and space. The ion beam spread in y-direction is minimized by the focussing nature of parallel plate condenser.
