fine structure

[ fahyn ]

noun

, Physics.

1. a group of lines that are observed in the spectra of certain elements, as hydrogen, and that are caused by various couplings of the azimuthal quantum number and the angular momentum quantum number.

fine structure

noun

1. the splitting of a spectral line into two or more closely spaced components as a result of interaction between the spin and orbital angular momenta of the atomic electrons Compare hyperfine structure

Word History and Origins

Origin of fine structure¹

First recorded in 1915–20

Example Sentences

Much to the team's surprise, Webb's view of the PAH emission highlights the galactic wind's fine structure -- an aspect previously unknown.

From Science Daily

This preserves their hydration and fine structure and thus their native state.

From Science Daily

The extra pressure on the dark matter from the quantum effect also inhibits fine structures in dark matter, resulting in a fuzzy appearance.

From Scientific American

Still, it is the case that songbirds, at least the species studied so far, do appear to be much better than humans at hearing changes in fine structure.

From Scientific American

You can break a sound waveform down into two levels of description: envelope and fine structure.

From Scientific American