Method and apparatus for detecting low-mass ions

Details Method and apparatus for detecting low-mass ions Method and apparatus for detecting low-mass ions

2006-01-03

2006-01-03

Lee, John R. (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S281000, C250S282000, C250S293000

Reexamination Certificate

active

06982417

ABSTRACT:
The present invention is a method and apparatus for generating a high frequency excitation signal for use in a mass spectrometer. Harmonics or aliases of a fundamental frequency contained in a signal from a digital-to-analog converter are used to excite ions in a Fourier transform ion cyclotron resonance mass spectrometer. The signal from the digital to analog converter may be filtered to remove the fundamental frequency or to remove unwanted harmonics or aliases.

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