equivalent width


Also found in: Acronyms.

equivalent width

A measure of the strength of a spectral line. The line profile of an absorption line, for example, shows a dip below the continuum level, and the equivalent width is calculated as the area of the dip divided by the height of the continuum. It is the wavelength range of the spectral line if the amount of absorption was redistributed into a rectangle having the intensity of the continuum.

equivalent width

[i′kwiv·ə·lənt ′width]
(physics)
A measure of the total absorption of radiant energy as indicated by an absorption line or absorption band.
References in periodicals archive ?
Devlin, possibly with Stan Lazaridis providing equivalent width on the left side, will be striving to provide plenty of ammunition for strikers Clinton Morrison and Stern John close to goal.
In this study, hundreds of the diffuse spectral features are measured with respect to central wavelength, equivalent width, and full width half-maximum of the Gaussian curve for each known and recently proposed DIB.
The foam-only modulus data, together with the solid modulus data and estimated skin thicknesses, were used to predict the load-deflection behavior of the structural foam samples by means of the equivalent width technique.
Specific examples include the effects on clustering of observed LAEs, the reduction of measured equivalent widths (EWs) as we probe higher redshifts, and also the effect on observed luminosity functions.