Absorption Line

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Absorption Line

A minute range of wavelength (or frequency) in the electromagnetic spectrum within which radiant energy is absorbed by the medium through which it is passing. Each line is associated with a particular mode of electronic excitation induced in the absorbing atoms by the incident radiation. See absorption spectrum, spectral line, telluric lines, Fraunhofer lines, absorption band.

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use