M2 film deposited with applied electric field perpendicular to the substrate exhibits some differences in absorption spectrum: sharp peak at ~500 nm diminishes while broad absorption is observed between 350 450 nm.
In contrast, gaseous N2 spectra have sharp Lorentzian peaks.
In the spectra, the sharp peak near 2.05 eV CP1), which is related to E1energy of GaSb.
In measured IR spectra, typical sharp and strong absorption bands at 2117 and 2107 cm 1 corresponding to the υ(C≡N) stretching vibration were identified (Figure 4).
In the spectra, the sharp and narrow peaks at 2θ = 40°, 46.6° and 68° were attributed to the presence of crystalline palladium [23, 24, 25, 26].
The spectra indicate sharp peak of first-order tangential G band and defect-related second-order D band at 1,592 cm−1 and 1,347 cm−1, respectively.
It was registered by the increase of resistivity, D band intensity in Raman spectra and sharp increase of the IR transmittance.
This is accompanied by Raman spectra with sharp definition of the 400 800 cm−1 band, indicating the importance of stabilization of subsurface oxygen species in obtaining high CH2O selectivity.
Photoluminescence (PL) emission spectra exhibited sharp, intense peaks at ∼ 539 nm, 593 nm, 615 nm, 651nm and 702 nm attributed to 5D0 → 7F0, 5D0 → 7F1, 5D0 → 7F2, 5D0 → 7F3 and 5D0 → 7F4 transitions of Eu3+ ions, respectively.
For non-conjugated pyrene substituted PDOF-PPF and PDAOPF-PPF, absorption spectra show sharp peak at about 354 nm, which should be attributed to intramolecular interaction of pyrene and main conjugation.
