Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Reexamination Certificate
2007-10-16
2007-10-16
Kim, Robert (Department: 2881)
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
C250S292000, C250S281000, C250S282000, C250S283000, C250S297000
Reexamination Certificate
active
11109762
ABSTRACT:
The method of the present invention is to select ions having a predetermined mass to charge ratio by applying an ion selecting electric field in an ion storage space of an ion storage device. The method is characterized in that the ion selecting electric field is generated to be proportional to a product of a) a base wave composed of a repetition of a unit wave of a constant amplitude and a predetermined pattern, and b) an amplitude pattern which changes continuously. The amplitude pattern is preferred to increase as time passes in order to gradually increase the intensity of the ion selecting electric field applied to the ion storage space until ions of a desired mass to charge ratio are selected. The unit wave may be generated by the FNF method or by the SWIFT method. Further, it is effective to increase the intensity of the frequency components of the unit wave as the frequency is further from the characteristic frequency of the object ion having a desired mass to charge ratio.
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Kim Robert
Shimadzu Corporation
Smith II Johnnie L
Westerman, Hattori, Daniels & Adrian , LLP.
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