This paper deals with the Budde Effect in Halogens@IAC

Narayana, TS

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The Budde Effect in Halogenr (Receioed for publication, March 10, 1934,) Experiments on the Budde effeeat in Halogens C l f  and Brp rere made under varied  condition^. Budde effect was found absent in  dry gasee. Experiments were made on pure dry CIS encloaed in a Pyrex bulb where ell heat lo~see from the glasa walls wera arrested; and photo-expansion was observed. Dry air+dry halogen mixtures showed expaneion on illumina- tion. The Budde effect waa founlE absent in the band absorption region. All the exiating theories are reviewed and diecussed. A meohanism b a e d  on the theory put forward by Born end Franck for the formation of a homopolar diatomic molecule is given and the divergent results of the various workers are reconciled. In 1871 Buddel observed that chlorine and bromine suffer an expansion, when exposed to rays of high ref rangibili tg ; and he explained it as due to some Iooseni ng of the binding forces in the molecule. The experiments of Ifellor,' 8 henstone," Bevan,' Baker,' ws we11 as those of Caldwel1,B RichardsonR7 and Pringsheim on this Budde effect in chlorine, have disclosed the fact that dry chlorine sllowed no espa~lsioi~ illspite of its absorbing the radiations of visible spectrum. On t,lle contmry , the recent work oE RiatiakowskygB Martin, Cole null Lent lo showed that the dry chlorine also cxllibits t be so-called h d d e  etyect, or photo-expansion. Likewise the Stadde effect was 

The Budde Effect in Halogens

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