Method of producing a broad-band signal for an ion trap mass spectrometer
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United States of America Patent
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Sep 23, 2003
Grant Date -
Aug 2, 2001
app pub date -
Jan 26, 2001
filing date -
Jan 31, 2000
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Abstract
A method of producing a broad-band signal including a plurality of component frequencies of regular or irregular intervals, where the broad-band signal is used to apply an alternating voltage to the end cap electrodes of an ion trap mass spectrometer. The method includes the following steps: (S3) a sinusoidal signal having one of the component frequencies with 0.degree. initial phase angle is generated; (S4) the sinusoidal signal is added to a current temporary superposed signal to produce an addition signal; (S5) the sinusoidal signal is subtracted from the current temporary superposed signal to produce a subtraction signal; (S6-S12) either of the addition signal or the subtraction signal is selected that has a smaller amplitude as a next temporary superposed signal; and (S13) the steps are repeated for all the component frequencies.
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