| US 7,589,321 B2 | ||
| Reaction cell and mass spectrometer | ||
| Yuichiro Hashimoto, Tachikawa (Japan); Hideki Hasegawa, Tachikawa (Japan); Takashi Baba, Kawagoe (Japan); and Izumi Waki, Tokyo (Japan) | ||
| Assigned to Hitachi High-Technologies Corporation, Tokyo (Japan) | ||
| Filed on Feb. 06, 2007, as Appl. No. 11/671,562. | ||
| Claims priority of application No. 2006-0727860 (JP), filed on Feb. 06, 2006. | ||
| Prior Publication US 2008/0073508 A1, Mar. 27, 2008 | ||
| Int. Cl. H01J 49/42 (2006.01) | ||
| U.S. Cl. 250—292 [250/281] | 16 Claims |
| 1. A mass spectrometer comprising:
an ion-trap which has a plurality of rod electrodes and generates a multipole field;
a means for generating a magnetic field in the axial direction of said ion trap;
a means for creating a DC harmonic potential in the axial direction of said ion trap; and
an electron source for introducing electrons to the central axis of said ion trap.
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