One of the mysteries of the English language finally explained.
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.
1920s; earliest use found in Henry Brose (b. 1890). From the names of Louis Carl Heinrich Friedrich Paschen and Ernst Emil Alexander Back, German physicist, who jointly published a description of the effect in 1913 ( Ann. der Physik 39 897) + effect.
Paschen–Back effect/ˌpaʃnˈbak ɪˌfɛkt/
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