What characterizes the spectral line for an ion ejected from a non-bonding orbital?

The spectral line for an ion ejected from a non-bonding orbital is characterized by a single, sharp line due to the specific energy transition involved in the process. Non-bonding orbitals are typically localized and have energies that do not change significantly due to interactions with other atoms or ions. When an ion is emitted from such an orbital, the transition corresponds to a very precise energy difference, leading to the emission of a photon with a specific wavelength.

This results in a clear, distinct spectral line rather than a broad signal or a series of closely spaced lines that are indicative of more complex interactions or overlapping energy levels typical in bonding scenarios. Additionally, ionization from non-bonding orbitals tends to involve fewer degrees of freedom that could otherwise contribute to additional features in the spectrum, further supporting the presence of a sharp line.