Paschen–Back effectn.

Brit.

/ˌpaʃnˈbak ᵻˌfɛkt/, U.S.

/ˌpæʃənˈbæk əˌfɛkt/

Origin: From proper names, combined with an English element. Etymons: proper names Paschen , Back , effect n.

Etymology: < the names of Louis Carl Heinrich Friedrich Paschen (see Paschen n.) and Ernst Emil Alexander Back (1881–1959), German physicist, who jointly published a description of the effect in 1913 ( Ann. der Physik 39 897) + effect n.

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.

ΘΚΠ

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).

单词	paschen–back effect
释义	Paschen–Back effectn. Brit. /ˌpaʃnˈbak ᵻˌfɛkt/, U.S. /ˌpæʃənˈbæk əˌfɛkt/ Origin: From proper names, combined with an English element. Etymons: proper names Paschen , Back , effect n. Etymology: < the names of Louis Carl Heinrich Friedrich Paschen (see Paschen n.) and Ernst Emil Alexander Back (1881–1959), German physicist, who jointly published a description of the effect in 1913 ( Ann. der Physik 39 897) + effect n. 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. ΘΚΠ 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). < n.1923
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