absorption line


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absorption line

A black line in the continuous spectrum of light passing through an absorbing medium.
See also: line
References in periodicals archive ?
Once calibrated, the elements represented by the dips in the graph (the absorption lines caused by elements in the star's atmosphere) are easy to determine.
The target CO absorption line in the near-infrared spectral region is shown in Figure 1(a).
In the spectrum of the suspension dispersed for 10 hours in the studied field the intensity line correlates with the absorption line in the spectrum of Masterbatch CW 2-45 carbon nanotubes (there is absorption line corresponding to the oscillation of C-O polar bond) (Fig.
The number of emission lines increased significantly, while most absorption lines detected earlier became weaker or disappeared.
Their presence has been revealed through the detection of hydrogen absorption lines in the spectra of distant quasars.
where the quantity A([bar.v] = ln([PHI]([bar.v])/[[PHI].sub.0]([bar.v])) is the spectral absorbance (Naperian), in certain cases (see, e.g., http://goldbook.iupac.org/A00028.html) also called extinction, and [A.sub.line] is the spectrally integrated area of the absorption line. Using (2) the species amount fraction can be derived from spectroscopic measurements as pointed out in previous publications [12].
For the case of a single absorption line and low CO concentrations it can lead to significant errors.
Photons having a wavelength equal to the first absorption line of the alkali atoms are absorbed by the cesium atoms, thus moving them to the excited state.
* MeerKAT Absorption Line Survey, led by Dr Yashwant Gupta and Dr Raghunathan Srianand, both associated with the Giant Metrewave Radio Telescope in India--4 000 hours.
The properties of atmospheric physics, the Earth's atmosphere, propagation of radiation, and molecular absorption in the atmosphere are the subjects of the introductory chapters, with separate sections on intensity and radiation flux, radiation transfer equations, and the main mechanisms of formation of the absorption line shapes.
Here the nation of France is cast seemingly as a 'faint hair-breadth line' (an absorption line, perhaps?); our world is said to be akin to a scintillating star, its beam dispersed and deciphered by these 'sublimer intelligences' (extraterrestrials, we presume, owing to 'the feeble shining of this earth') to glean our 'every thought and act, every vice and virtue'--a whimsy indeed more audacious than a remote assay of our chemical essence!
The cells developed by the team have volumes just under 10 m[m.sup.3], with spectral line widths less than 1 kHz for a 9.2 GHz Cs hyperfine absorption line. Other cells fabricated at NIST using the same process, and with volumes as small as 1 m[m.sup.3], have line widths only slightly larger.