Some Measurements of H/D Polarizability Isotope Effects Using Differential Refractometry

1989 ◽  
Vol 44 (5) ◽  
pp. 371-375 ◽  
Author(s):  
Mary Foster Smith ◽  
W. Alexander Van Hook
Keyword(s):  
Refractive Index ◽  
Isotope Effects ◽  
Electronic Charge ◽  
Static Polarizability ◽  
Second Moment ◽  
Electronic Charge Distribution ◽  
Yield Values ◽  
Differential Refractometry ◽  
Refractive Index Data ◽  
Vibrational Contribution

Refractive index differences between the H and D isomers of some common molecules in the liquid phase were measured between 404.7 and 690.0 nm. The data are combined with information on molar volume isotope effects to yield values for H/D isotope effects on the static polarizability, the vibrational contribution to the static and frequency dependent parts of the polarizability, and the H/D isotope effect on the second moment of the electronic charge distribution. The present results suffice to demonstrate the practicability of this technique to measure the components of the polarizability listed above. However for accurate resolution of the vibrational and second moment contributions, refractive index data of still greater precision will be required.

Comments on H/D Isotope Effects on Polarizabilities of Small Molecules. Correlation with Virial Coefficient, Molar Volume, and Electronic Second Moment Isotope Effects

1994 ◽  
Vol 49 (4-5) ◽  
pp. 563-577 ◽  
Author(s):  
W. Alexander Van Hook ◽  
Max Wolfsberg
Keyword(s):  
Refractive Index ◽  
Molar Volume ◽  
Isotope Effect ◽  
Virial Coefficient ◽  
Isotope Effects ◽  
Thermodynamic Activity ◽  
Vibrational Amplitude ◽  
Second Moment ◽  
Index Data ◽  
Refractive Index Data

Abstract Literature data on H/D isotope effects on polarizability are reviewed. An argument based on perturbation theory correlates the isotopic differences with electronic transition moments via vibrational averaging. The contribution of the second moment isotope effect is especially important. The approach is first illustrated with a calculation on H2/D2 and then employed to correlate differential refractive index data on about twenty other H/D isotopic pairs. A table of bond polarizability isotope effects is presented which permits the estimation of polarizability isotope effects for various kinds of H/D substituted compounds. Coupling these results with known isotope effects on vibrational amplitude permits calculation of vapor phase virial coefficient isotope effects, while combina­tion with refractive index data on liquids yields reasonable values for the sum of the isotope effects on molar volume and electronic second moment. However the quantitative correlation of the polarizability isotope effect with isotope effects on vapor pressure or thermodynamic activity is less direct.

Stereochemistry of nucleic acids and polynucleotides III. Electronic charge distribution

Biopolymers ◽  
1971 ◽  
Vol 10 (7) ◽  
pp. 1159-1167 ◽  
Author(s):  
V. Renugopalakrishnan ◽  
A. V. Lakshminarayanan ◽  
V. Sasisekharan
Keyword(s):  
Nucleic Acids ◽  
Charge Distribution ◽  
Electronic Charge ◽  
Electronic Charge Distribution

scholarly journals Prediction of excess molar volumes of selected binary mixtures from refractive index data

2014 ◽  
Vol 79 (6) ◽  
pp. 707-718 ◽  
Author(s):  
Jelena Vuksanovic ◽  
Divna Bajic ◽  
Gorica Ivanis ◽  
Emila Zivkovic ◽  
Ivona Radovic ◽  
...  
Keyword(s):  
Refractive Index ◽  
Binary Mixtures ◽  
Excess Molar Volumes ◽  
Mixing Rules ◽  
Mixing Rule ◽  
Molar Volumes ◽  
Index Data ◽  
Peg 400 ◽  
Benzene Toluene ◽  
Refractive Index Data

The excess molar volumes of twenty two binary mixtures containing various groups of organic compounds: alcohols (ethanol, 1-propanol, 1,2-propanediol, 1,3-propanediol and glycerol), ketone (acetone), ester (butyl lactate), lactam (N-methyl-2-pyrrolidone), PEGs (PEG 200, PEG 400) and aromatics (benzene, toluene and pyridine) were predicted from the refractive index data, using three types of equations coupled with several mixing rules for refractive index calculations: the Lorentz-Lorenz, Dale-Gladstone, Eykman, Arago-Biot, Newton, and Oster. The obtained results were analysed in terms of the applied equation and mixing rule and the nature of interactions between the mixtures? components.

scholarly journals Intra-seasonal oscfffations of radio refractive index during southwest monsoon over India

MAUSAM ◽  
2022 ◽  
Vol 44 (3) ◽  
pp. 271-276
Author(s):  
H. N. SRIVASTAVA ◽  
K. C. SINHARAY ◽  
R. K. MUKHOPADHYAY
Keyword(s):  
Refractive Index ◽  
Monsoon Season ◽  
Temporal Variations ◽  
Southwest Monsoon ◽  
The Individual ◽  
Southwest Monsoon Season ◽  
Seasonal Oscillations ◽  
Refractive Index Data ◽  
Indian Seas ◽  
Variance Explained

The study deals with the spatial and temporal variations of intra-seasonal oscillations in radio refractive index during southwest monsoon season over India and islands over Indian seas. Average daily radio refractive index data from 1 June to 30 September and that of the individual years for the period 1969-1986 were subjected to harmonic analysis to investigate the contributions of various periodicities in monsoon radio refractive index. The inter-annual variability of various intra-seasonal oscillations have been studied for each 5° latitudinal strip from 50 oN to 30° N with the help of variance explained by various frequency modes for different years. Variance explained by 30-60 day and 10-20 day modes were studied in relation to monsoon performance.   The northward and eastward propagation of30.60 day mod~ was noticed. The 10.20 day mode and seasonal mode dominate at latitudinal belts 5°N.10oN and 25°N-30°N respectively. Between 10°N and 25°N, both 30-60 day and 10-20 day modes occur.  

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