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Ionization

The initial step in mass spectrometry where molecules are converted into ions, typically by electron impact or chemical ionization.

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The statement of the theorem

Define the ionization process

\mathcal{I}: M \rightarrow M^+ + e^-

. If the process is modeled by electron impact ionization (EI) with incident electron energy

E_{inc}

, the resulting ion

M^+

is characterized by the conservation of energy and momentum, such that the internal energy

E_{int}

of the resulting ion is given by:\n

\langle E_{int} \rangle = E_{inc} - E_{bind} - E_{kin}

Source: Wikipedia