Editing Michelson–Morley experiment (section)

===Other tests of Lorentz invariance===
{{Further|Modern searches for Lorentz violation}}
[[File:Lithium-7-NMR spectrum of LiCl (1M) in D2O.gif|thumb|225px|<sup>7</sup>Li-[[NMR]] spectrum of [[LiCl]] (1M) in D<sub>2</sub>O. The sharp, unsplit NMR line of this [[isotope]] of [[lithium]] is evidence for the isotropy of mass and space.]]
Examples of other experiments not based on the Michelson–Morley principle, i.e., non-optical isotropy tests achieving an even higher level of precision, are [[Hughes–Drever experiment|Clock comparison or Hughes–Drever experiments]]. In Drever's 1961 experiment, <sup>7</sup>Li nuclei in the ground state, which has total angular momentum ''J''&nbsp;=&nbsp;3/2, were split into four equally spaced levels by a magnetic field. Each transition between a pair of adjacent levels should emit a photon of equal frequency, resulting in a single, sharp spectral line. However, since the nuclear wave functions for different ''M<sub>J</sub>'' have different orientations in space relative to the magnetic field, any orientation dependence, whether from an aether wind or from a dependence on the large-scale distribution of mass in space (see [[Mach's principle]]), would perturb the energy spacings between the four levels, resulting in an anomalous broadening or splitting of the line. No such broadening was observed. Modern repeats of this kind of experiment have provided some of the most accurate confirmations of the principle of [[Lorentz covariance|Lorentz invariance]].<ref group=A name=haugan/>