Patent ID: 7777182
Filing Date: 2010-08-17
Classification: B01D,H01J

Abstract:
1. An ion cyclotron spectrometry apparatus, comprising: a vacuum chamber that extends at least along a z-axis; a plurality of opposed electrode pairs positioned within the vacuum chamber and extending along the z-axis, wherein the ion cyclotron spectrometry apparatus is configured for producing a magnetic field within the vacuum chamber and between the plurality of opposed electrode pairs so that a magnetic field vector between the plurality of opposed electrode pairs is generally parallel to the z-axis; and a voltage source electrically connected to the plurality of opposed electrode pairs and configured to simultaneously apply at least a trapping voltage function to the plurality of opposed electrode pairs and an excitation voltage function to a subset of the plurality of opposed electrode pairs, the trapping voltage function configured to establish a trapping electric field between the plurality of opposed electrode pairs and comprising at least a first section configured to induce a first magnetron effect that increases a cyclotron frequency of an ion and at least a second section configured to induce a second magnetron effect that decreases the cyclotron frequency of the ion so that the ion traversing the at least first and second sections will experience no net change in cyclotron frequency.