The cover depicts two possible trajectories for an ion passing through
a quadrupole mass filter. In one case (yellow) the RF voltage is low
enough so that the Y component of the trajectory is unstable and the
ion hits a Y rod. In the other case (blue) the RF voltage has been
increased so that both X and Y components are stable and the ion gets
through the filter. More information on quadrupole mass spectrometry
can be found in the two articles by Henchman and Steel on pages
1042 and on
1049, respectively.
The cover illustration was created by Michael Douma.
The cover was designed by Betsy True.
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