full width at half maximum

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A measure of the width of a line in a spectrum, either emission or absorption. It is simply the width of the line at a point that is half the line’s peak value. FWHM is usually quoted in nanometres, but can also be given as a velocity by applying the Doppler effect, since motions in the gas govern the width of the line. The absorption-line equivalent is full width at half depth. See also Beamwidth.

Subjects: Astronomy and Astrophysics.

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