Title:
A METHOD OF SELECTIVE ION TRAPPING FOR QUADRUPOLE ION TRAP MASS SPECTROMETERS
Document Type and Number:
WIPO Patent Application WO/1995/018669
Kind Code:
A1
Abstract:
A power efficient selective mass range trap filling process in which the RF trapping voltage (46) connected to the ring electrode (10) is slowly modulated simultaneously with: (1) e-beam ionization bombardment (41) and (2) application of a broadband supplemental waveform (49) containing selected secular frequencies to the QIT end caps (8, 9). The modulation (42) permits the reduction of the number of frequency components required in the broadband supplemental waveform (49) and permits elimination of absorption by ions of energy from more than one supplemental frequency component at any one time.
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Inventors:
Wells, Gregory J.
Wang, Mingda
Wang, Mingda
Application Number:
PCT/US1995/000329
Publication Date:
July 13, 1995
Filing Date:
January 11, 1995
Export Citation:
Assignee:
VARIAN ASSOCIATES, INC.
International Classes:
H01J49/42; (IPC1-7): B01D59/44; H01J49/00
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