Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Reexamination Certificate
2011-04-19
2011-04-19
Johnston, Phillip A (Department: 2881)
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
C250S282000, C250S287000
Reexamination Certificate
active
07928372
ABSTRACT:
A mass spectrometer is provided in which ions are favorably introduced into a loop orbit or favorably led out from the loop orbit without affecting the motion of the ions flying along the loop orbit. An ion-introduction orbit5is set to correspond to the orbit (ejection orbit portion4) of ions after being bent by the sector-shaped electric field E1in the loop orbit4. When ions are introduced, a voltage applied to the electrode unit11is put to zero to release the sector-shaped electric field E1. Then the ions emitted along the ion-introduction orbit5fly straight in the electrode unit11. The direction and position of the ions coming out from the exit end of the electric field is the same as those ions flying along the loop orbit4. Therefore, there is no need for placing a deflection electrode for introducing/leading-out ions on the loop orbit.
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Nishiguchi Masaru
Ogawa Kiyoshi
Ueno Yoshihiro
Yamaguchi Shin-ichi
Johnston Phillip A
Shimadzu Corporation
Sughrue & Mion, PLLC
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