Define molecular ion. How it is formed?
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An ion formed by removing (positive ion), or adding (negative ion), one or more electrons from a molecule M to form M• or M••.
It is formed when the vaporized organic sample passes into the ionization chamber of a mass spectrometer, it is bombarded by a stream of electrons. These electrons have a high enough energy to knock an electron off an organic molecule to form a positive ion.
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