a) Ion clouds in quadrupole ion traps are stored in a space that is rather confined. How is it achieved to keep the ions close to the center of the trap?
b) Why is it important to control the ion population in a QIT or LIT?
c) Which type of quadrupole ion trap is less susceptible to space charge effects, the QIT or the LIT?
d) So how do you control the number of ions admitted to a QIT or LIT?
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