absorption spectrum


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absorption spectrum:

see spectrumspectrum,
arrangement or display of light or other form of radiation separated according to wavelength, frequency, energy, or some other property. Beams of charged particles can be separated into a spectrum according to mass in a mass spectrometer (see mass spectrograph).
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absorption spectrum

A spectrum that is produced when electromagnetic radiation has been absorbed by matter. Typically, absorption spectra are produced when radiation from an incandescent source, i.e. radiation with a continuous spectrum, passes through cooler matter. Radiation is absorbed (i.e. its intensity is diminished) at selective wavelengths so that a pattern of very narrow dips or of wider troughs – i.e. absorption lines or bands – are superimposed on the continuous spectrum.

The wavelengths at which absorption occurs correspond to the energies required to cause transitions of the absorbing atoms or molecules from lower energy levels to higher levels. In the hydrogen atom, for example, absorption of a photon with the required energy results in a ‘jump’ of the electron from its normal orbit to one of higher energy (see hydrogen spectrum).

The absorption lines (or bands) of a star are produced when elements (or compounds) in the outermost layers of the star absorb radiation from a continuous distribution of wavelengths generated at a lower level in the star. Basically the same elements occur in stars. Since each element has a characteristic pattern of absorption lines for any particular temperature (and pressure) range, there are several different types of stellar spectra depending on the surface temperature of the star. See spectral types. See also emission spectrum.

Absorption Spectrum

 

the spectrum that results when optical or X-radiation is passed through a substance and is selectively absorbed.

absorption spectrum

[əb′sȯrp·shən ‚spek·trəm]
(spectroscopy)
A plot of how much radiation a sample absorbs over a range of wavelengths; the spectrum can be a plot of either absorbance or transmittance versus wavelength, frequency, or wavenumber.
References in periodicals archive ?
2] NPs with a peak of absorption spectrum in 290nm, spherical particles shape, suitable particle size (30-110 nm at 1064nm and 10- 90 nm at 532nm) and negative zeta potential (-14.
The UV-Vis-NIR absorption spectrum revealed an N-related peak at 270 nm and decreasing absorbance from 300 to 700 nm (Figure 4).
The dynamic quenching only affects the excited state of quenching molecule with no function on the absorption spectrum of quenching substances, whereas a complex of HSA and drug forms in static quenching, so there will be some changes in the spectra of the HSA [17].
In the neighbourhood of [lambda] = 1/v = 1,5 [micro]m CO has the second overtone of its absorption spectrum (known as the 3 v band).
17, the peak absorption spectrum decreased between heights of 15 nm and 50 nm, and increased from a height of 50 nm onward.
The trans-[beta]-carotene was identified by co-chromatography with standard and visible absorption spectrum in mobile phase and little fine structure consistent with [beta]-carotene standard eluted in the same conditions.
In the future, it is hoped that CQD technology will lead to highly efficient solar cells that take less energy to produce, are flexible and absorb more of the sun's energy than silicon, which is limited by its inherent absorption spectrum.
California Analytical Instruments' 600/6000 Series FTIR provides fast, continuous and stable analysis of virtually any gas that has an infrared absorption spectrum.
What is special about this product is its extremely wide and constant absorption spectrum from just a few megahertz to more than 50 gigahertz.
As seen, the shape of the absorption spectrum of PPME resembles that of PPa with two strong absorption vibronic bands centered at 412.
Optical absorption spectrum at near infrared peak of samples was obtained by infrared furrier transformation method.