Method of mass analyzing a sample by use of a quadrupole ion...

Details Method of mass analyzing a sample by use of a quadrupole ion... Method of mass analyzing a sample by use of a quadrupole ion...

B - Operations, Transporting

01

D

358/9

B01D 59/44 (2006.01) H01J 49/42 (2006.01)

Patent

CA 1207918

ABSTRACT OF THE DISCLOSURE: In a quadrupole ion store or ion trap type mass spectrometer, significantly improved mass selection is achieved by scanning the applied RF and DC voltages or the frequency .omega. sequentially to render unstable trapped ions. These are passed out through apertures in an end cap to a high gain electron multiplier to provide a signal indicative of the ion mass. Sensi- tivity and mass resolution is also enhanced by oper- ating the ion trap at a relatively high pressure in the range 1 X 10-1 to 1 X 10-5 torr. The presence of collision gas molecules, such as helium, improves sensitivity and mass resolution. In addition, the structure itself is built of stacked units, sealed by O-rings, which are easily disassembled for cleaning.

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