Combination-Scattering and ``Association of Molecules''

Leitman, S. I.; Ukholin, S. A.

doi:10.1063/1.1749402

Cited by 6 publications

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The Raman spectrum of sulphur dioxide in different states

Gerding¹,

Nijveld²

1937

Recl. Trav. Chim. Pays‐Bas

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The influence of the state of matter on the three vibrations of sulphur dioxide has been studied.For that reason the R a m a n spectra of gaseous SO:! at 12 atmospheres, of liquid SO:! at 40" and 70", of solutions of SOs in water and of mixtures of SO? with CCL (and SOa) were investigated.The difference between A T g a s and n r l i q u i d for the strongest R a m a n line of SO. , is equal to 6 cm--'. This is to be ascribed to the action of the electrostatic fields of the dipole molecules in the liquid.For solutions in water (at 50"). the dissolved SO2 is in a state comparable with the gaseous one. The concentration of HsSO:t in the solution can only be small.For the mixtures only small displacements of the Raman lines have been found.T h e spectrum of the mixtures consists in first approximation of a superposition of the spectra of the two components.The experimental arrangement used, is described in detail.W h e n light from a discontinuous source e.g. a mercury arc is directed into -for example -a liquid, the scattered light, examined in a direction perpendicular to that of the original beam, does not contain only the wave-lengths present in the primary radiation, the so-called R a y l e i g h lines, but also light of modified wave-length in much smaller intensities is present. This effect, discovered by R a m a n in 1928, has its origin in an exchange of energy 'between the primary radiation of the arc with the molecules of the liquid, governed by the simple relation given by S m e k a 1 :In this equation hv represents the energy of a quantum of radiation of the incident light with frequency v ( h is P 1 a n c k ' s constant), hv' is that for a quantum of the diffracted light with frequency v'.

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The Raman spectrum of sulphur dioxide in different states

Gerding¹,

Nijveld²

1937

Recl. Trav. Chim. Pays‐Bas

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Kohlrausch

1938

Der Smekal-Raman-Effekt

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�ber die molekulare Assoziation der Essigs�ure

Koteswaram

1938

Z. Physik

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Das Raman-Spektrum der Essigs~ure wurde untersueht in dem polaren L6sungsmittel Wasser und den unpolaren L6sungsmitteln Benzol und Tetrachlorkohlenstoff. W~hrend bei w~isserigen L6sungen der S~ure deutliche ~~nderungen ihrer Raman-Frequenzen auftraten, konnten solche in unpolaren LSsungsmitteln nieht beobachtet werden. Waehsende Temperatur erzeugt ~hnliche Effekte wie L6~ung in Wasser. Aus diesen Ergebnissen wird geschlossen, dab die S~ure bei Zimmertemperatur hoeh polymerisiert ist, bei hSheren Temperaturen in niedrigere Polymere zerf~llt, ebenso wie bei L6sung in tmpolaren LSsungsmitte]n. Unpolare L6sungsmittel zeigen dagegen keinen EinfluB auf den Grad der Polymerisation. Fiir die Bildung yon Hydraten wurde kein unmittelbares Anzeichen gefnnden.

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Combination-Scattering and ``Association of Molecules''

Cited by 6 publications

References 0 publications

The Raman spectrum of sulphur dioxide in different states

The Raman spectrum of sulphur dioxide in different states

Literaturnachweis

�ber die molekulare Assoziation der Essigs�ure

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