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In Ion spectroscopy, the primary ion is usually which of the following?

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In Ion spectroscopy, the primary ion is usually which of the following?

(a) Inert gas ion

(b) Halogen ion

(c) Oxygen group gas ion

(d) Hydrogen

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The above asked question is from Ion Spectroscopy topic in chapter Electron and Ion Spectrometers of Analytical Instrumentation

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The correct answer is (a) Inert gas ion

Explanation: In Ion spectroscopy, the primary ion is usually an inert gas ion. When primary ion having particular kinetic energy is incident on a surface certain phenomena can occur.

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