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In reverse-geometry mass spectrometer which of the following precedes the electric sector?

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In reverse-geometry mass spectrometer which of the following precedes the electric sector?

(a) Nebulizer

(b) Orifice

(c) Magnetic sector

(d) Mass spectrometer

I got this question during an online exam.

This interesting question is from Tandem Mass Spectroscopy in section Mass Spectrometer of Analytical Instrumentation

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Correct answer is (c) Magnetic sector

Easiest explanation: In reverse-geometry mass spectrometer magnetic sector precedes the electric sector. Early work on MS/MS was done with reverse-geometry double focussing mass spectrometer.

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