Figure 3 - uploaded by Ives Jonathan Amster
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Schematic diagram of the active bandpass filter used to filter white noise. R f , R g and R q are adjusted to acquire the desired bandpass output.
Source publication
Radiofrequency (RF) chirp and filtered white noise are compared as waveforms for broadband quadrupolar excitation, Ions are formed by matrix-assisted laser desorption Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry and axialized by quadrupolar excitation, Both quadrupolar excitation waveforms are capable of axializing ions over...
Context in source publication
Context 1
... filtered white noise experiments use a simi- lar sequence of events as the repetitive chirp studies. White noise from the frequency generator is passed through an active bandpass filter, shown in Figure 3, that was constructed on a breadboard. This signal is amplified and applied to the cell excite plates. ...
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Citations
A new method is described which allows a broad mass range of ions from multiple MALDI events to be accumulated in an FIICR analyzer cell prior to detection. Signal intensity and signal-to-noise ratio are observed to grow in direct proportion to the number of laser shots, providing a substantial improvement to the analysis of low-level samples compared to more commonly used signal-averaging methods. In addition, calibrant ions desorbed from a separate sample spot can be added to the analyzer cell after an analyte population has been accumulated, providing an internal mass standard without the necessity of mixing calibrant and analyte. This method provides excellent mass accuracy by eliminating mass errors due to space charge effects.
