MASS-SPECTROSCOPY USING A ROTATING ELECTRIC-FIELD

A mass spectrograph using a rotating electric field and position-sensi tive detection is described. Its principles of operation are explained , and a prototype instrument and its test results are presented and di scussed. Examination of how the instrument's properties vary under cha nges of its parameters (e.g., geometry) shows how it can be tailored t o specific measurement requirements. The general case utilizing detect ion in two (polar) dimensions is discussed, and limiting cases employi ng one-dimensional imaging in each direction, azimuthal and radial, ar e presented. Applications are suggested and courses for further develo pment are put forth. (C) 1998 American Institute of Physics. [S0034-67 48(98)04206-3].