Optical constants, dielectric constants, molar absorption coefficients, molar polarizability, vibrational assignment and transition moments of liquid iodobenzene between 4000 and 400cm−1 at 25°C

2007 ◽  
Vol 67 (1) ◽  
pp. 125-138 ◽  
Author(s):  
C. Dale Keefe ◽  
Ellen Butler ◽  
Elizabeth Gillis ◽  
Jennifer L. MacDonald
Keyword(s):  
Optical Constants ◽  
Dielectric Constants ◽  
Vibrational Assignment ◽  
Absorption Coefficients ◽  
Transition Moments ◽  
Molar Polarizability

Radiothermal radiation method for aqueous solutions

2021 ◽  
Author(s):  
L.A. Morozova ◽  
S.V. Savel’ev
Keyword(s):  
Dielectric Properties ◽  
Alkali Metal ◽  
Thermal Radiation ◽  
Aqueous Solutions ◽  
Physical Properties ◽  
Dielectric Constants ◽  
Water Molecules ◽  
Absorption Coefficients ◽  
Basic Substance ◽  
High Dilutions

For the first time, an ultra-high-sensitivity method for measuring radio-thermal radiation was developed and used in practice in order to establish the difference in the physical properties of aqueous solutions of substances in the millimeter region of the spectrum. The method is used to study the dynamics of the dielectric properties of aqueous solutions depending on the composition of the base substance and its concentration. The dynamics of dielectric properties establishes a one-to-one correspondence between the number and concentration of ions of the dissolved basic substance contained in water and the number of water molecules involved in cooperative interaction, which gives a consistent microscopic picture of ion-water cooperative interactions in the studied aqueous solutions of K2SO4 and Cs2SO4. The density of water molecules perturbed by the ions of the base substance contained in the hydration shell at normal concentrations is proportional to the number of ions, while the transition to weaker solutions leads to the creation of multilayer hydration shells. This means that the number of perturbed water molecules, depending on the number of ions, increases according to a law different from linear. In accordance with the experimental data, the values of the absorption coefficients of aqueous solutions were determined in a wide range of concentrations for alkali metal sulfates. It is noted that alkali metal sulfates have physical properties that generalize the dynamics of dielectric constants depending on the concentration of the base substance. A monotonic increase in the values of the absorption coefficients of solutions with a decrease in the concentration of basic substances in the region of high dilutions was established with individual dynamics for each basic substance, reflecting the total hydration changes in salt solutions. Research has shown that the proposed method for measuring radio-thermal radiation fixes a significant difference in the values of the dielectric constants of aqueous solutions at high dilutions from their values for water.

Optical Response of Mixed Molybdenum Dichalcogenides for Solar Cell Applications Using the Modified Becke–Johnson Potential

2016 ◽  
Vol 71 (3) ◽  
pp. 213-223 ◽  
Author(s):  
Ushma Ahuja ◽  
Ritu Joshi ◽  
D.C. Kothari ◽  
Harpal Tiwari ◽  
K. Venugopalan
Keyword(s):  
Solar Cell ◽  
Dielectric Constants ◽  
Full Potential ◽  
Energy Bands ◽  
Absorption Coefficients ◽  
Augmented Plane Wave ◽  
Wave Technique ◽  
Degree Of Anisotropy ◽  
Dependent Absorption ◽  
First Time

AbstractEnergy bands and density of states (DOS) of mixed molybdenum dichalcogenides like MoS2, MoSeS, MoSe2, MoTe2, MoTeS, and MoTe0.5S1.5 are reported for the first time using the Tran–Blaha modified Becke–Johnson potential within full potential-linearised augmented plane wave technique. From the partial DOS, a strong hybridisation between the Mo-d and chalcogen-p states is observed below the Fermi energy EF. In addition, the dielectric constants, absorption coefficients, and refractivity spectra of these compounds have also been deduced. The integrated absorption coefficients derived from the frequency-dependent absorption spectra within the energy range of 0–4.5 eV show a possibility of using molybdenum dichalcogenides, particularly MoTe0.5S1.5, in solar cell applications. Birefringence and degree of anisotropy are also discussed using the data on refractivity and imaginary components of the dielectric constant.

Antimony Bismuth Alloy Films: Preparation, Optical and Thermal Properties

2010 ◽  
Vol 663-665 ◽  
pp. 227-230
Author(s):  
Xin Miao Lu ◽  
Yi Qun Wu ◽  
Yang Wang
Keyword(s):  
Optical Constants ◽  
Dielectric Constants ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Alloy Films ◽  
Extinction Coefficients ◽  
X Ray ◽  
Glass Substrates ◽  
Bismuth Alloy ◽  
K9 Glass

Antimony bismuth alloy films were deposited on Si and K9 glass substrates by magnetron-control sputtering method. The structure of the film was studied with x-ray diffraction (XRD). The thermal property of the film was researched by differential scanning calorimetry (DSC). The optical constants of the films including refractive index (n) and extinction coefficients (k) are measured by ellipsometry, and the dielectric constants (=r+ii), absorption coefficients  were also calculated.

scholarly journals Optical Properties of Alkali Halides in Ultraviolet Spectral Regions

Optics ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 18-31 ◽  
Author(s):  
Khagendra P. Bhandari
Keyword(s):  
Alkali Halide ◽  
Optical Constants ◽  
Complex Function ◽  
Alkali Halides ◽  
Current Theory ◽  
Dielectric Constants ◽  
The Real ◽  
Band Transition ◽  
Alkali Halide Crystals ◽  
Kronig Relation

The optical reflectance spectra of alkali halide crystals KI and RbI were measured over the energy range of 4.14 to 6.91 eV. Both single crystal and poly-crystal samples were used to accomplish this task. The phase θ ( ω ) was computed using the Kramers-Kronig relation between the real and imaginary parts of the complex function, ln r = ln | r | + i θ ( ω ) . Subsequently, the optical constants n and κ were determined from the Fresnel reflectivity equation. The real and imaginary parts of dielectric constants ε 1 and ε 2 were then calculated using n and κ. The optical absorption spectra of the crystal have also been measured in these spectral regions. The spectra agree reasonably well with the current theory concerning exciton peaks. In addition, a shoulder was found in the spectra similar to those previously seen and associated with the band-to-band transition in the alkali iodides.

The dielectric constants and absorption coefficients of alcohols

1924 ◽  
Vol 197 (4) ◽  
pp. 525
Author(s):  
G.F.S.
Keyword(s):  
Dielectric Constants ◽  
Absorption Coefficients

Optical constants, and vibrational assignment of liquid bromobenzene-d5 between 4000 and 400 cm−1 at 25°C

2001 ◽  
Vol 597 (1-3) ◽  
pp. 259-268 ◽  
Author(s):  
C Dale Keefe ◽  
Leslie A Donovan
Keyword(s):  
Optical Constants ◽  
Vibrational Assignment

scholarly journals Tailoring the Optical Properties of Polymers Blend Nanocomposites

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Y.K. Saraswat ◽  
Shalini Agarwal ◽  
Vibhav K. Saraswat
Keyword(s):  
Optical Properties ◽  
Optical Constants ◽  
Dielectric Constants ◽  
Solution Casting ◽  
Structural And Optical Properties ◽  
Casting Method ◽  
Tio2 Content ◽  
Vis Spectroscopy ◽  
Solution Casting Method ◽  
Blend Nanocomposites

The presented work deals with the structural and optical properties of chemically synthesized TiO2 nanoparticles filled PC/PS blend nanocomposites. A series of PC/PS (100/0, 50/50, 0/100 wt%/wt %) -TiO2 (1, 2, 3 wt %) blend nanocomposites have been prepared by solution casting method. Prepared blend nanocomposites have been subjected to XRD, SEM and FTIR for structural analysis. Optical constants have been analyzed using UV-Vis spectroscopy. The XRD, SEM and FTIR spectrum confirms the formation of PC/PS-TiO2 blend nanocomposites. Results reveal the decrease in band gap and enhancement in optical constants like, extinction coefficient, refractive index and dielectric constants of blend nanocomposites with nanofiller TiO2 content.

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