High Resolution Mass Spectrometry of Light Ions in a Penning Trap

✍ Scribed by S. Brunner; T. Engel; H. Klein; G. Werth

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 690 KB
• Volume: 10
• Category: Article
• ISSN: 0951-4198
• DOI: 10.1002/(sici)1097-0231(19960331)10:5<573::aid-rcm496>3.0.co;2-6

✦ Synopsis

After a brief introduction to the electromagnetic ion trap, we concentrate on the problems related to precise determination of cyclotron fhquencies of stored ions. Since these frequency measurements are performed in order to obtain mass ratios we want to point out the inherent difficulties in detecting mass ratios different from 1.0. We then describe the time-of-flight method of detecting ion cyclotron resonance signals. With a small Mom temperature Penning trap of characteristic size d= 18 mm in a 7 T magnetic field we study the effect of changing electrical field anharmonicities (i.e. dodecapole term) and of various ion numbers on the cyclotron frequency.

'endcap' with a potential difference V between them. In the asymptotic region and behind the holes in the endcaps additional compensation electrodes are located. The magnetic field is parallel to the symmetry axis of the trap.