Mass spectrometry method using time-varying filtered noise

Details Mass spectrometry method using time-varying filtered noise Mass spectrometry method using time-varying filtered noise

H - Electricity

01

J

H01J 49/42 (2006.01)

Patent

CA 2122153

2122153 9309562 PCTABS00022 A method for performing mass analysis with dynamic mass resolution, in which a time-varying notch filtered broadband voltage signal (sometimes denoted as a time-varying "filtered noise" signal) is applied to a quadrupole mass filter (11-14). The time-varying filtered noise signal (22) can consist of a rapid sequence of static (time-invariant) filtered noise signals, each defining a notch having a selected width and center location. The invention facilitates performance of mass analysis over a wide range of ion mass-to-charge ratios ("mass ranges") with adequate mass resolution. By appropriately choosing the width of each notch in the applied time-varying filtered noise, mass analysis can be performed with substantially constant mass separation over a wide mass range. In order to maintain substantially constant mass separation while analyzing a selected consecutive or non-consecutive sequence of ions (by passing such sequence of ions through the mass filter), the applied filtered noise (22) should have narrower notches at times when ions with higher mass-to-charge ratio are to be selected, and wider notches at times when ions with lower mass-to-charge ratio are to be selected.

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