Having a charge enables you to not only detect molecules but also to measure their masses, which you can't do with neutral molecules.
More Quotes from R. Cooks:
The two most important aspects are that this can be done at atmospheric pressure and just by heating a sample, a procedure which is much simpler than existing ionization methods using a laser or high-energy beam. The method does not require a high-voltage power source.R. Cooks
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