spectral line

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spectral line

n.
An isolated bright or dark line in a spectrum produced by emission or absorption of light of a single wavelength.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

spec′tral line′


n.
a line in a spectrum due to the absorption or emission of light at a discrete frequency.
[1865–70]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
The outflow was detected by the millimeter-wavelength signature of a molecule called hydroxyl (OH), which appeared as an absorption line: essentially, the shadow of an OH fingerprint in the galaxy's bright infrared light.
The goal is to click on a dip caused by a known absorption line. That's why it's important to use a prominent A-type star for calibration.
By modulating DFB laser's driving current and working temperature, the center wavelength can be tuned across the absorption line of a target gas.
In the field of optical spectroscopy, a two-parameter assessment of the characteristics of the absorption line is provided by the peak position ([E.sub.Peak]) and the full width at half maximum (FWHM).
In the IR spectrum of suspension dispersed for 2 hours the intensity absorption line corresponds to the absorption line in the spectrum of carboxymethyl cellulose (i.e.
Another feature is a strong absorption line of Mg II at 4482 [Angstrom] (Figure 3).
Chandra grating spectromers, combined with earlier XMM-Newton and Chandra observations, gave a 4[sigma] detection of the OVII K[alpha] absorption line in the spectrum of a background blazer (a bright nonthermal source thought to be powered by accretion onto a supermassive black hole) at redshift z = 0.165 behind the SculpterWall, a large superstructure of galaxies at z = 0.03 [11].
The quantities [[PHI].sub.0] and [PHI] are the incident and the transmitted radiant powers; [S.sub.T] is the molecular transition line strength of the probed absorption line at gas temperature T which is matched to the actually present isotopic abundance by means of [r.sub.iso], which is the ratio of the abundance in the sample compared to the value for which the line strength is reported.
Radiation absorption analysis for a given substance can be done for a single absorption line (dispersive methods) or for wide spectrum (non-dispersive methods) [2], [6].
Spectroscopic observations map the Mrk 509 warm absorber, study the mini-broad absorption line quasar PG 1126-041, determine the source of reddening in low ionization BAL quasars, and probe quasar winds using narrow intrinsic absorption lines.
A circularly polarized laser light transmitted through a glass cell containing a vapor of alkali atoms (e.g., Cs) resonates when its frequency equals the first absorption line of the alkali atoms, thus creating a spin alignment that precesses with a frequency proportional to the modulus of an externally applied magnetic field, [B.sub.0] (Larmor frequency, [w.sub.L] = [gamma][absolute value of [B.sub.0]]).
But the aim is to create a system with a small cell containing acetylene gas and send the beam from the laser through it: if the laser is not on the right frequency, the light "dips" as it goes through the absorption line and comes back.