Discussion
What kind of sample does electrospray ionisation suit?
Answer: D
Spraying a solution from a charged capillary produces ions from proteins and other large polar molecules without heating them at all, which is why it made biological mass spectrometry possible. Small volatile molecules are better served by electron impact, and involatile solids by laser desorption. An ionisation method that works from solution couples naturally to liquid chromatography, which is much of why it spread. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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