Reconstruction of fundamental absorption spectra of material by its refractive index spectrum in transparency region

1995 ◽  
Author(s):  
Bohdan V. Andriyevsky
Keyword(s):  
Refractive Index ◽  
Absorption Spectra ◽  
Transparency Region ◽  
Refractive Index Spectrum

Infrared Intensities of Liquids XX: The Intensity of the OH Stretching Band of Liquid Water Revisited, and the Best Current Values of the Optical Constants of H2O(l) at 25°C between 15,000 and 1 cm−1

1996 ◽  
Vol 50 (8) ◽  
pp. 1047-1057 ◽  
Author(s):  
John E. Bertie ◽  
Zhida Lan
Keyword(s):  
Refractive Index ◽  
Liquid Water ◽  
Peak Height ◽  
Dielectric Constants ◽  
The Real ◽  
Infrared Intensities ◽  
Refractive Index Spectrum ◽  
Relative Errors ◽  
Integrated Intensities ◽  
Normal Laboratory

The previously reported nonreproducibility of the intensity of the OH stretching band of liquid water has been explored. It was found that it can be eliminated in measurements with the Circle® multiple ATR cell by ensuring that the ATR rod is coaxial with the glass liquid holder. It was also found that normal laboratory temperature variations of a few degrees change the intensity by ⩽∼1% of the peak height. A new imaginary refractive index spectrum of water has been determined between 4000 and 700 cm1 as the average of spectra calculated from ATR spectra recorded by four workers in our laboratory over the past seven years. It was obtained under experimental and computational conditions superior to those used previously, but is only marginally different from the spectra reported in 1989. In particular, the integrated intensities of the fundamentals are not changed significantly from those reported in 1989. The available imaginary refractive index, k, values between 15,000 and 1 cm−1 have been compared. The values that are judged to be the most reliable have been combined into a recommended k spectrum of H2O(l) at 25 °C between 15,000 and 1 cm−1, from which the real refractive index spectrum has been calculated by Kramers–Kronig transformation. The recommended values of the real and imaginary refractive indices and molar absorption coefficients of liquid water at 25 ± 1 °C are presented in graphs and tables. The real and imaginary dielectric constants and the real and imaginary molar polarizabilities in this wavenumber range can be calculated from the tables. Conservatively estimated probable errors of the recommended k values are given. The precision with which the values can be measured in one laboratory and the relative errors between regions are, of course, far smaller than these probable errors. The recommended k values should be of considerable value as interim standard intensities of liquid water, which will facilitate the transfer of intensities between laboratories.

Development of Low-Cost Abbe Refractometer

2018 ◽  
Vol 879 ◽  
pp. 227-233
Author(s):  
Weeratouch Pongruengkiat ◽  
Thitika Jungpanich ◽  
Kodchakorn Ittipornnuson ◽  
Suejit Pechprasarn ◽  
Naphat Albutt
Keyword(s):  
Refractive Index ◽  
Optical Materials ◽  
Low Cost ◽  
Optical Component ◽  
Refractive Indices ◽  
Constant Number ◽  
Optical Wavelength ◽  
Refractive Index Spectrum ◽  
Transparent Polymers ◽  
Abbe Refractometer

Refractive index and Abbe number are major physical properties of optical materials including glasses and transparent polymers. Refractive index is, in fact, not a constant number and is varied as a function of optical wavelength. The full refractive index spectrum can be obtained using a spectrometer. However, for optical component designers, three refractive indices at the wavelengths of 486.1 nm, 589.3 nm and 656.3 nm are usually sufficient for most of the design tasks, since the rest of the spectrum can be predicted by mathematical models and interpolation. In this paper, we propose a simple optical instrumental setup that determines the refractive indices at three wavelengths and the Abbe number of solid and liquid materials.

scholarly journals On the influence of their state in solution on the absorption spectra of dissolved dyes

1909 ◽  
Vol 82 (554) ◽  
pp. 256-270 ◽  
Keyword(s):  
Refractive Index ◽  
Absorption Spectra ◽  
Organic Solvents ◽  
Absorption Maximum ◽  
Previous Investigation ◽  
Cyanine Dyes ◽  
Water Band ◽  
The One

In a previous investigation of the absorption spectra and sensitising properties of some iso cyanine dyes,* the influence of the solvent was examined and it was found that the absorption maximum was shifted toward the red as the refractive index of the solvent increased. This is in accordance with Kundt’s law. The absorption in water, however, differs markedly from that in organic solvents. In the latter the spectrum consists of a prominent band in the orange and a half-shade nearer the blue. In water this half-shade has become a separate band comparable in intensity with the orange. Absorption curves in alcohol and water are shown. It is convenient to term the band near the red the β-(organic) band, the one nearer the blue the α -(water) band. It appeared desirable to investigate this difference further.

The Colorants Effects of Fe2O3 on Borosilicate Glasses Prepared from Subbituminous Fly Ash

2015 ◽  
Vol 1119 ◽  
pp. 731-735
Author(s):  
W. Rachniyom ◽  
Y. Ruangtaweep ◽  
K. Boonin ◽  
K. Phachana ◽  
J. Kaewkhao
Keyword(s):  
Refractive Index ◽  
Fly Ash ◽  
Chemical Composition ◽  
Crystal Structures ◽  
Absorption Spectra ◽  
Borosilicate Glasses ◽  
Ferrous Ions ◽  
Melt Quenching ◽  
Hardness Values

In this work, the subbituminous fly ash (SFA) in Thailand has been investigated for their compositions and crystal structures. Borosilicate glasses were prepare from SFA , B2O3, Na2O and various concentration of Fe2O3 by melt quenching technique. The results have shown that the chemical composition comprised with SiO2, Al2O3 and Fe2O3. The crystal structures of SFA were raised of mullite and quartz phases. The density and refractive index values of glasses were found to increase with increasing of Fe2O3 concentrations. The hardness values have been decreased with increasing of Fe2O3 content. The absorption spectra are corresponding to ferric and ferrous ions in wavelength of 440 nm and 1,050 nm and the color of glasses are green to yellow.

Refractive index effects on the absorption spectra of macromolecules

1992 ◽  
Vol 25 (10) ◽  
pp. 2608-2613 ◽  
Author(s):  
L. H. Garcia-Rubio
Keyword(s):  
Refractive Index ◽  
Absorption Spectra

Measurement of the complex refractive-index spectrum for birefringent and absorptive liquids

1998 ◽  
Vol 37 (22) ◽  
pp. 5169 ◽  
Author(s):  
Mitsunori Saito ◽  
Norihisa Matsumoto ◽  
Jiro Nishimura
Keyword(s):  
Refractive Index ◽  
Complex Refractive Index ◽  
Refractive Index Spectrum
Sign in / Sign up

Export Citation Format

Share Document