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ISS is sensitive to every element heavier than which of the following?

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ISS is sensitive to every element heavier than which of the following?

(a) Helium

(b) Hydrogen

(c) Nitrogen

(d) Neon

I have been asked this question by my college director while I was bunking the class.

My question comes from Instrumentation of Ion Spectroscopy in chapter Electron and Ion Spectrometers of Analytical Instrumentation

1 Answer

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The correct answer is (a) Helium

The explanation: ISS is sensitive to every element heavier than helium. The lightest isotope used as a primary ion is that of helium.

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