| 释义 |
Paschen–Back effect Physics.|ˌpæʃən ˈbæk|
[f. Paschen1 + the name of Ernst E. A. Back (1881–1959), German physicist, who jointly published a description of the effect in 1913 (Ann. der Physik XXXIX. 897).]
An effect observed when a source of spectral lines is in a magnetic field so strong that the resultant splitting of each line is comparable in magnitude to the separation of the 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.
1923H. L. Brose tr. Sommerfeld's Atomic Struct. & Spectral Lines vi. 389 The Paschen–Back effect links together only such lines as belong together in a series as multiplicities. 1964G. 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. 1970G. K. Woodgate Elem. Atomic Struct. viii. 150 This strong-field limit of the Zeeman effect is called the Paschen–Back effect. |