Discussion
How does a magnetic sector analyser separate ions?
Answer: C
A magnetic field bends each ion's path, and heavier ions curve less for the same accelerating voltage, so scanning the field brings each mass in turn onto the detector. The other three describe the quadrupole, the time-of-flight and the ion trap. Sector instruments give the highest resolution but are large and slow, which is why they have largely given way to the others outside specialist work. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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