Refractive index and optical absorption properties of the complexes of a cyclobutane containing thiazolyl hydrazone ligand

Spectral characterization, optical band gap calculations and DNA binding of some binuclear Schiff-base metal complexes derived from 2-amino-ethanoic acid and acetylacetone

“…The measured absorbance (A) was used to calculate approximately the absorption coefficient (a) by using the relation a = 1/d ln A (1) where, d is the width of the cell. The optical band gap (E g ) is calculated from the relation: ahm = A (hm À E g ) m (2), where m is equal to 1/2 and 2 for direct and indirect transition respectively, A is an energy independent constant [29,30]. The values of a calculated from relation (1) was used to plot (ahm) 2 and (ahm) 1/2 vs. hm from which a direct band gap was found (Fig.…”

Sol–gel derived Li–Mg co-doped ZnO films: Preparation and characterization via XRD, XPS, FESEM

“…The refractive index is an important parameter for optical materials and applications. Thus, it is important to determine optical constants of the films and the complex optical refractive index of the films are described by the following relation [44],…”

Optical constants of TiO1.7 thin films deposited by electron beam gun

“…13 shows the variation of optical conductivity σ opt as a function of photon energy hν. The increase in optical conductivity at high photon energies is due to the high absorbance of titanium oxides thin films and also may be due to the electron excited by photon energy [30].…”