Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Reexamination Certificate
2005-04-12
2005-04-12
Lee, John R. (Department: 2881)
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
C250S293000, C250S288000, C250S282000, C250S291000, C250S292000, C250S297000
Reexamination Certificate
active
06878933
ABSTRACT:
The subject invention provides improved methods for injecting ions into a quadrupole ion trap mass spectrometer (QIT-MS). The methods of the subject invention are applicable to procedures involving atmospheric pressure laser desorption (AP-LD) of a sample to be investigated. Specifically, the subject invention involves controlling the pulse frequency of the laser such that the laser pulses are synchronized with changes in radiofrequency (RF) amplitude levels of the QIT-MS. Advantageously, by utilizing the methods of the subject invention it is possible to improve the accuracy and reproducibility of the results while improving duty cycle and reducing sample consumption.
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Lee John R.
Saliwanchik Lloyd & Saliwanchik
Souw Bernard E.
University of Florida
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