Noun
the presence of groups of closely spaced spectrum lines observed in the atomic spectrum of certain elements
Source: WordNetfine-structure
The thing that we at MIT must understand is the amount of real damage that is being done to us in the fine structure of how research funds are expended. Charles M. Vest
the fine structure results from slightly different energy levels Source: Internet
Anthropic explanation The anthropic principle is a controversial argument of why the fine-structure constant has the value it does: stable matter, and therefore life and intelligent beings, could not exist if its value were much different. Source: Internet
Further applying special relativity theory to the elliptic orbits, Sommerfeld succeeded in deriving the correct expression for the fine structure of hydrogen spectra (which happens to be exactly the same as in the most elaborate Dirac theory). Source: Internet
For reasons of convenience, historically the value of the reciprocal of the fine-structure constant is often specified. Source: Internet
Indeed, some theories citation that predict a variable fine-structure constant also predict that the value of the fine-structure constant should become practically fixed in its value once the universe enters its current dark energy -dominated epoch. Source: Internet