Line Absorption Spectra in Solids at Low Temperatures in the Visible and Ultra-violet Regions of the Spectrum

Nature ◽  
1929 ◽  
Vol 123 (3101) ◽  
pp. 525-526 ◽  
Author(s):  
S. FREED ◽  
F. H. SPEDDING
Keyword(s):  
Absorption Spectra ◽  
Low Temperatures ◽  
Ultra Violet ◽  
Line Absorption

scholarly journals The ultra-violet absorption spectra of some complex aromatic hydrocarbons—II

1937 ◽  
Vol 158 (895) ◽  
pp. 634-650 ◽  
Keyword(s):  
Absorption Spectra ◽  
Aromatic Hydrocarbons ◽  
Low Temperatures ◽  
Ultra Violet ◽  
Induction Coil ◽  
Experimental Investigations ◽  
Quantitative Measurements ◽  
Biological Importance

The results of the study of the absorption spectra of a number of complex aromatic hydrocarbons, some of which are of considerable biological importance, were described in a previous paper (Part I).* The present paper contains results of similar experimental investigations, together with an account of quantitative measurements at low temperatures. For general theoretical relationships, nomenclature, and technique at room temperatures, reference should be made to Part I, the results here described being obtained as before with a “ Spekker ” photometer. The only experimental change is the substitution of a transformer for the induction coil outfit previously employed. Purity of Materials With few exceptions, all of the compounds studied were prepared synthetically in this Institute by methods described in the original memoirs to which reference is made. The specimens employed for spectroscopic purposes were the original highly purified analytical samples or else specimens which had been specially prepared and purified for examination.

The ultra-violet absorption spectra of some methyl-substituted benziminazoles

1951 ◽  
Vol 4 (5) ◽  
pp. 338-347 ◽  
Author(s):  
G.H. Beaven ◽  
E.R. Holiday ◽  
E.A. Johnson
Keyword(s):  
Absorption Spectra ◽  
Ultra Violet

Melting and crystal structure: association in nitrate melts

1965 ◽  
Vol 285 (1401) ◽  
pp. 263-274 ◽  
Keyword(s):  
Absorption Spectra ◽  
Freezing Point ◽  
Ultra Violet ◽  
Linear Variation ◽  
Univalent Cations ◽  
Electrical Conductivities ◽  
Alkaline Earths ◽  
Linear Effects ◽  
Nitrate Anions ◽  
Structure Association

By using various mixtures, properties of molten nitrates can be studied at temperatures well below the freezing points of any pure nitrates of alkalis or alkaline earths. Molar volumes, viscosities, electrical conductivities and ultra-violet absorption spectra have been investigated in this way for mixed nitrate melts down to 140°C. For a typical pair of uni-univalent cations, such as potassium and sodium, each of these properties shows practically linear variation for all mixtures down to the lowest temperatures studied. On the other hand, cations such as calcium with a higher polarizing power cause marked deviations from linearity in transport properties and absorption spectra in certain mixtures. However, even in such mixtures no excess volume is found, and temperature variation of the molar volume remains linear. Effects observed are discussed in terms of the closest approach between cations and the nitrate anions in these melts. As the temperature falls, there appears to be progressive formation of regions of increased packing density in the melt and corresponding irregular voids. These more densely packed regions may be termed ‘clusters’ or ‘associated’ groups of ions. Although probably smaller, such transient clusters have analogies with ‘flickering clusters’ proposed in some models for water near its freezing point.

Ultra-violet Absorption Spectra of the Diazines

Nature ◽  
1960 ◽  
Vol 187 (4736) ◽  
pp. 500-501 ◽  
Author(s):  
K. KEITH INNES ◽  
JAMES A. MERRITT ◽  
WAYNE C. TINCHER ◽  
SHELBY G. TILFORD
Keyword(s):  
Absorption Spectra ◽  
Ultra Violet
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