| 摘要 |
PROBLEM TO BE SOLVED: To simplify the structure of an ion transport optical system. SOLUTION: Two electrodes 1a, 1b each composed of spirally winding a metal conductor rod are so arranged that respective windings are alternated and separated at predetermined intervals in the direction of an ion optical axis C. When high voltages having different phases from each other by 180 deg. are applied to the respective electrodes 1a, 1b through each individual power feeding point, an ion passing passage 4 having a generally cylindrical pseudo potential wall is formed inside the windings. Because the electrodes 1a, 1b may be held, for instance, only at their both end windings, a holding mechanism is simplified.
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