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In glow discharge ion source, the sample is atomised by which of the following process?

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In glow discharge ion source, the sample is atomised by which of the following process?

(a) Evaporation

(b) Sputtering

(c) Heating

(d) Annealing

I had been asked this question in a national level competition.

This intriguing question comes from Components of Mass Spectrometer topic in division Mass Spectrometer of Analytical Instrumentation

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Correct option is (b) Sputtering

To elaborate: In glow discharge ion source, the sample is atomised by the process of sputtering. It not only atomizes the sample but also provides means by which these atoms are ionized.

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