Paschen–Back effectn.
/ˌpaʃnˈbak ᵻˌfɛkt/, U.S. /ˌpæʃənˈbæk əˌfɛkt/ Physics.
The splitting of spectral lines that occurs when their source is in a magnetic field so strong that the splitting of each line is comparable in magnitude to the separation of adjacent lines in a multiplet.The spacing of the lines corresponding to the normal Zeeman effect rather than the anomalous Zeeman effect generally observed at lower field strengths.
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the world > matter > physics > atomic physics > decomposition of light, spectrum > [noun] > effect involving magnetic field
Zeeman effect1897
Paschen–Back effect1923
the world > matter > physics > electromagnetic radiation > magnetism > [noun] > magnetic field > splitting effect
Zeeman effect1897
Lorentz triplet1922
Paschen–Back effect1923
1923 H. L. Brose tr. A. J. W. Sommerfeld Atomic Struct. & Spectral Lines vi. 389 The Paschen–Back effect links together only such lines as belong together in a series as multiplicities.
1964 G. W. King Spectrosc. & Molecular Struct. iii. 109 A magnetic field that would be strong enough to produce a resolvable splitting of nuclear Zeeman lines is usually more than sufficient to uncouple I* from J* and cause them to precess independently around the z axis, giving a nuclear Paschen–Back effect instead.
1997 Jrnl. Physics: Condensed Matter 9 10881 Since in the f levels the internal exchange splitting dominates,..the energy level scheme is that of the Paschen–Back effect.
This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022).
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n.1923