absorption band


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ab·sorp·tion band

the range of wavelengths or frequencies in the electromagnetic spectrum where radiant energy is absorbed by passage through a gaseous, liquid, or dissolved substance; it is exploited for analytical purposes in colorimetry or spectrophotometry, and is usually described in terms of the wavelength where maximum absorbance occurs (that is, λmax).
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This difference is evidenced by the greater presence of several absorption bands evident in the five substrates (Figures 3 and 4).
Irradiation of azomethine imine 1-4 O solutions in acetonitrile with light of [[lambda].sub.irr] 365 nm results in spectral changes in the characteristic of negative photochromism due to intramolecular photocyclization into diaziridines 1-4 C (Scheme 2), accompanied by a decrease in the intensity of long-wave absorption maxima and the appearance of absorption bands in the short-wave region of the spectrum [10, 30, 31] as shown in Figure 2(a) in the example of compound 1 and in Table 1.
FTIR chemical maps/images can be obtained plotting the intensities of characteristic absorption bands, coded by a chromatic scale, in correspondence with their spatial position on a selected sample area.
This was due to the largest absorption band edge energy, good particle size distribution, and smaller sizes of uniform shapes.
There is no correlation between the hydrogen bond energy and the value of the absorption band shift because the absorption band is formed by [pi]-electron system, and hydrogen bond is formed by the [delta]-electron system.
In the eukaryotic [Cys.sub.2][His.sub.2] ZF, the substitution of the second cysteine may result in some cases (i.e., the substitution with an aspartate or with a glutamate [48]) in coordination geometries different than the native tetrahedral coordination demonstrated by weak d-d absorption bands. Here, we found an intense band at 589 nm that, together with NMR and CD data, indicates a tetrahedral coordination of the metal ion with a resulting blue shift of the d-d absorption bands.
Absorption spectra of A1-4 exhibit an absorption band at 358-363 nm while KA1-4 exhibited two distinct absorption bands.
In spectrum of SP-80, the absorption band corresponding to oleic acid is considerably more expressed (v = 2924 [cm.sup.-1]) - the ratio of absorption intensity of ester groups and oleic acid makes 1/1.75.
Our calculations show that the surface defects introduce mid-gap states that are weakly optically active resulting in a lowest energy red shifted absorption band. We then have explored the Forster resonance energy transfer (FRET) rates between QDs of different sizes, different surface passivation, and at different distances.
The typical characteristic of absorption band corresponding to C-O-C of oxazine at 1229 [cm.sup.-1], CH2 at 1319 [cm.sup.-1], tri-substituted benzene ring at 1496 [cm.sup.-1] and C-H at 927 [cm.sup.-1] decreased [9,6,2,10].
Spectra of the diluted solutions ([less than or equal to] [10.sup.-6] M) indicated only the monomer features in the form of a single absorption band with the maximum at ~487 nm (Figure 4, curve 1).
TABLE 4: Results of regression analysis of the dependence between the positions of the long-wavelength absorption band maxima and the Koppel-Palm and Kamlet-Ta[beta] solvent parametersa.