Title:
METHOD FOR SELECTIVE COLLISION DISSOCIATION USING PERIPHERAL EFFECT EXCITATION TOGETHER WITH CONVENTIONAL COOLING TIME CONTROL
Document Type and Number:
Japanese Patent JP3904616
Kind Code:
B2
Abstract:
PURPOSE: To avoid disorder of ion paths and suppress an ultimate ion loss and expansion of the trap size by taking cooling time for ions in ionization process in a quadrupole ion trap to form a high signal-to-noise ratio.
CONSTITUTION: This method is to selectively dissociate parent ions by collision dissociation in a quadrupole ion trap (hereafter called as a trap) and comprises the following processes (a)-(f): (a) introducing a buffer gas into the trap; (b) injecting a sample gas to be analyzed into the trap; (c) applying at least an RF field with an amplitude V and d.c. potential U to capture ions with a selected mass/charge ratio in a selected stabilized operation mode of the trap; (d) ionizing the sample; (e) continuously carrying out the application of the RF field at selected various time intervals; and (f) adjusting the amplitude V or the potential U to assume the value of the energy from the RF filed to be transmitted non-resonant manner to the selected ions.
Inventors:
Raymond E March
Frank A. Rondry
Sylvia Katinella
Frank A. Rondry
Sylvia Katinella
Application Number:
JP13672794A
Publication Date:
April 11, 2007
Filing Date:
May 27, 1994
Export Citation:
Assignee:
Varian, Incorporated
International Classes:
G01N27/62; H01J49/42; (IPC1-7): H01J49/42; //G01N27/62
Domestic Patent References:
| JP62037861A | ||||
| JP1097350A |
Attorney, Agent or Firm:
Inaoka cultivation
Mio Kawasaki
Mio Kawasaki
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