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

The fine structure is the separation between two specific energy levels in the atom.

From Science News For Students

Physicists in England at University College London measured what’s known as the fine structure of these atoms.

From Science News For Students

A team of physicists from University College London measured the separation between two specific energy levels of positronium, what’s known as its fine structure.

From Science News

This fine structure is a railroad and wagon bridge and affords all necessary facilities for the movement of military stores.

From Project Gutenberg

In one flash there had been overthrown the fine structure which he had built about her in his thoughts.

From Project Gutenberg

It was a very fine structure, carved in Chinese fashion, and of great architectural beauty.

From Project Gutenberg

It is a fine structure in the p. 68perpendicular style, and is one of the handsomest old churches in the city.

From Project Gutenberg

The church is a fine structure of great antiquity, in the perpendicular style.

From Project Gutenberg