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The ions are focussed and de-clustered through which of the following regions?

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The ions are focussed and de-clustered through which of the following regions?

(a) Dry helium region

(b) Wet oxygen region

(c) Wet chlorine region

(d) Dry nitrogen region

This question was addressed to me in my homework.

Enquiry is from Liquid Chromatograph- Mass Spectrometer topic in section Mass Spectrometer of Analytical Instrumentation

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The correct choice is (d) Dry nitrogen region

For explanation: The ions are focussed and de-clustered through a dry nitrogen region. It is then sent into the high vacuum analyser.

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