absorption edge

absorption edge

[əb′sȯrp·shən ‚ej]
(spectroscopy)
The wavelength corresponding to a discontinuity in the variation of the absorption coefficient of a substance with the wavelength of the radiation. Also known as absorption limit.
References in periodicals archive ?
An absorption edge is a sharp discontinuity in the absorption spectrum by an element appearing when the photon energy corresponds to the energy of a shell of the atom.
The position of the absorption edge was determined by extrapolating the linear portions of [alpha] versus hv curves (see Fig.
The optical band gaps of the thin films were determined from the absorption spectra near the absorption edge.
3] absorption edge occurs between the two spectral features.
2 show that the absorption edge is close to experimental wavelength 532 nm.
The compilations contains K- and L x-ray transition and absorption edge energies for all of the elements from neon to fermium and includes carefully selected and evaluated experimental data and trusted estimates obtained from state-of-the-art theoretical procedures.
Figure 3 indicates an absorption edge at about 840 nm due to the optical transition from the valence band and conduction band.
The sharp absorption edge for PVDF indicates the semicrystalline nature of PVDF.
U], according to the idea that the sharp absorption edge is enlarged by the electric fields produced by charged impurities; the third region describes the optical absorption generated by defects appearing at an energy lower than the optical gap; it is sensitive to the structural properties of the materials, being defined as the so-called Urbach tail, [E.
This is below the absorption edge of Fe to avoid interference from background Fe fluorescence for elements (in our study, Mn) with an absorption edge less than that of Fe and located close to the Fe absorption edge.
In glasses prepared in Au crucibles, the absorption edge is shifted to shorter wavelengths and the color of the glass is changed from red to yellowish, respectively.
In this paper, we investigated the effects of introducing cadmium ions in PbS thin films deposition bath, on the fundamental absorption edge and structures of the PbS thin films.