Discussion
Why must the sample be ionised before analysis?
Answer: B
Every analyser works by accelerating and deflecting particles with fields, and a neutral molecule feels no force from either. Mass is irrelevant to whether a field acts at all, fragmentation is a consequence of some ionisation methods rather than the purpose, and the detector requirement follows from the same fact. That the technique's first step exists only to make the second possible is worth keeping in mind when a fragile molecule is destroyed by it.
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