anomalous dispersion

American  

noun

Physics.

1. a sudden change in the refractive index of a material for wavelengths in the vicinity of absorption bands in the spectrum of the material.

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Etymology

Origin of anomalous dispersion

First recorded in 1880–85

Example Sentences

The theory of anomalous dispersion has been applied in a very interesting way by W. H. Julius to explain the “flash spectrum” seen during a solar eclipse at the moment at which totality occurs.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" by Various

Some bodies reflect light of one colour and transmit that of another; such bodies nearly always possess the properties of selective or metallic reflection and anomalous dispersion.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6 "Cockaigne" to "Columbus, Christopher" by Various

A very remarkable example of anomalous dispersion, which was first observed by A. Kundt, is that exhibited by the vapour of sodium.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" by Various

Sellmeier's equation may also be modified to apply to the case of anomalous dispersion.

From The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde by Various

This is exactly in accordance with the observed facts in the case of substances showing anomalous dispersion.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" by Various