| 摘要 |
<p>An apparatus and method for isolation or selected ions of interest in a 2-D ion trap 120 is provided, The 2-D ion trap 120 of the invention has an octopole field which is obtained by modification of the electrodes 31, 32, 33, 34, 41, 42, 43, 44, 62, 69, 67, 68, 220, modification of the positioning of the electrodes 31, 32, 22, 34, 41, 42, 43, 44, 62, 69, 67, 68, 220 or both. The 2-D ion trap 1 20 of the invention also includes a means 63, 64 for forcing ion motion in the ion trap 120 in a first and a second direction independently and sequentially.</p> |
