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Which of the following is not a type of ionisation?

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Which of the following is not a type of ionisation?

(a) Field ionisation

(b) Spontaneous ionisation

(c) Spark ionisation

(d) Chemical ionisation

The question was asked in semester exam.

Question is from Components of Mass Spectrometer topic in portion Mass Spectrometer of Analytical Instrumentation

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The correct answer is (b) Spontaneous ionisation

Explanation: Spontaneous ionisation is not a type of ionisation. In mass spectrometer, ionisation is brought about by thermal or electrical energy.

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