multiplet

A spectral line having more than one component, representing slight variations in the energy states characteristic of an atom.

Any group of subatomic particles that are similar in most properties, but have different electric charges, such as the nucleons, which form a doublet, or the pions, which form a triplet.

A spectral line that has multiple components

A compound peak produced in several forms of spectroscopy

Any of several groupings of subatomic particles that share most properties, but have different charges