Impurity Absorption Bands in Thermoluminescent LiF

1967 ◽  
Vol 22 (1) ◽  
pp. 71-76 ◽  
Author(s):  
E. W. Claffy
Keyword(s):  
Absorption Bands ◽  
Impurity Absorption

The Effects of Deoxidants on Ge-Se-Te Chalcogenide Glasses

2011 ◽  
Vol 103 ◽  
pp. 458-463
Author(s):  
Xun Si Wang ◽  
Jie Sun ◽  
Qiu Hua Nie ◽  
Shi Xun Dai ◽  
Xiang Hua Zhang ◽  
...  
Keyword(s):  
Chalcogenide Glasses ◽  
Transmission Spectra ◽  
Absorption Bands ◽  
Minimum Concentration ◽  
Impurity Absorption ◽  
Ir Transmission ◽  
Different Content ◽  
The Relationship ◽  
Concentration Of Impurities ◽  
Main Impurity

In order to decrease the impurity absorption bands of Ge-Se-Te chalcogenide glasses in IR region. Three different kinds of deoxidants including Mg(magnesium), Al(aluminium) and Ca(calcium) were chosen. Properties measurements including density, Vis-NIR and infrared (IR) transmission spectra were adopted to analyze the relationship between impurity absorption bands and deoxidants. The concentrations of impurities in glass samples with different content of Mg were calculated by method of optic spectra. The results show that Mg is a better choice as deoxidant for chalcogenide glasses compared to Al and Ca. The values of main impurity concentration decrease from 4417.833 to 0 ppmw for Ge-O and from 55.236 to 0 ppmw for Si-O with increasing content of Mg, respectively. At least 200ppm Mg is needed to minimize the main absorption bands in IR region and G5 glass incorporated with 400ppm Mg has minimum concentration of impurities which means that it possesses the optimal transmission properties.

Shapes of Impurity Absorption Bands in Solids

1965 ◽  
Vol 140 (2A) ◽  
pp. A601-A617 ◽  
Author(s):  
Thomas H. Keil
Keyword(s):  
Absorption Bands ◽  
Impurity Absorption

Moments of Impurity Absorption Bands in Solids

1966 ◽  
Vol 13 (1) ◽  
pp. 175-179 ◽  
Author(s):  
A. Gold ◽  
T. H. Keil
Keyword(s):  
Absorption Bands ◽  
Impurity Absorption

Polarimetric Observations of Red Variables: A Study of Gas and Particle Interactions

1979 ◽  
Vol 46 ◽  
pp. 386-408 ◽  
Author(s):  
G. V. Coyne ◽  
I. S. McLean
Keyword(s):  
Wavelength Dependence ◽  
Stellar Atmosphere ◽  
Molecular Absorption ◽  
Absorption Bands ◽  
Absorption And Emission ◽  
Mira Variables ◽  
Stellar Photosphere ◽  
Regular Variable ◽  
Red Supergiants ◽  
Balmer Lines

AbstractIn recent years the wavelength, dependence of the polarization in a number of Mira variables, semi-regular variables and red supergiants has been measured with resolutions between 0.3 and 300 A over the range 3300 to 11000 A. Variations are seen across molecular absorption bands, especially TiO bands, and across atomic absorption and emission lines, especially the Balmer lines. In most cases one can ignore or it is possible to eliminate the effects due to interstellar polarization, so that one can study the polarization mechanisms operating in the stellar atmosphere and environment. The stars Omicron Ceti. (Mira), V CVn (semi-regular variable) and Mu Cephei (M2 la), in addition to other stars similar to them, will be discussed in some detail.Models to explain the observed polarization consider that the continuum flux is polarized either by electron, molecular and/or grain scattering or by temperature variations and/or geometrical asymmetries over the stellar photosphere. This polarized radiation is affected by atomic and molecular absorption and emission processes at various geometric depths in the stellar atmosphere and envelope. High resolution spectropolarimetry promises, therefore, to be a power-rul tool for studying stratification effects in these stars.

Investigation of the fine structure in overtone absorption bands of 12C2H4

1999 ◽  
Vol 97 (1) ◽  
pp. 265-277 ◽  
Author(s):  
M. BACH, R. GEORGES, M. HERMAN, A. PER
Keyword(s):  
Fine Structure ◽  
Absorption Bands
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