The
absorption band near 1100 [cm.sup.-1] can be attributed to the presence of carboxylic groups bound to metal cations, both nutrients and pollutants.
Figure 4(a) shows IR
absorption bands of stretching vibration of the hydroxyl group (OH), 3600-3100 [cm.sup.-1] of LDPE films exposed to C[O.sub.2] laser radiation at different fluencies and PE-BIO without exposure to C[O.sub.2] laser radiation.
The absorbance spectra of PbS-PbS-T nanocrystals exhibited low
absorption bands (bands shown in green and blue color) located at ~225 nm (~5.5 eV), ~352 nm (~3.6 eV), 501 nm (2.4 eV), ~589 nm (~2.1 eV), ~618 nm (~2.0 eV), ~665 nm (~1.8 eV), ~774 nm (~1.6 eV), and ~789 nm (~1.5 eV) due to a strong confinement effect [3-6, 10, 28].
Absorption, [[lambda].sup.abs A .sub.max], nm 1 241 0.21 2 261 0.12 3 275, 318 0.10, 0.07 4 249 0.88 * [[lambda].sup.abs.sub.max] and [[lambda].sup.fl].sub.max] max: maxima of absorption and fluorescence bands, respectively; [I.sub.fl]: fluorescence intensity; A: optical density at the maximum of
absorption band of form C after irradiation with light of 365 nm for 2 min.
However, this unusual behaviour is theoretically obtainable from the Ketteler-Helmholtz dispersion relations when the bandwidth of the
absorption band is very large.
Univariate chemical maps obtained by integration of the
absorption band at (a) 1600 [cm.sup.-1]; (b) 2928 [cm.sup.-1]; (c) 1030 [cm.sup.-1]; (d) 1155 [cm.sup.-1].
The 50% PVP-capped CdSe nanoparticles gave the highest energy in
absorption band edges as compared to other percentages of PVP reported in this work.
The calculation results of the spectral position of the long-wavelength
absorption band for two cases of the ammonia molecule location are given in Table 2.
Intense
absorption bands around 589-670 nm are also observed for both proteins.
FTIR showed the
absorption band for olefinic group at 3223-3218 [cm.sup.-1].
However, in the Lonzest sample the
absorption band, corresponding to ester groups (v = 1742 ...
Infrared spectroscopy of both fragments (using a Thermo Scientific Nicolet iS50 FT-IR spectrometer) showed a pattern characteristic of opal, with a strong
absorption band around 5200 [cm.sup.-1] (Figure 9).
