Spectra of SeO and SeOFormula

R. K. Asundi, Mohd. Jan-Khan, R. Samuel
1936 Proceedings of the Royal Society A  
el d by Sir C. V. R a m a n , F.R.S.-Received 2 [Plate 1] An analysis of the near ultra-violet bands of SOa, proposed recently* has shown, that the energies of excitation are almost equal in SO and S 0 2 and that the frequency of the symmetric valence vibration of SOa is about equal to the vibrational frequency of SO not only in the ground states of the two molecules, but also in their respective excited states. These results seem to be of considerable interest, particularly with regard to the
more » ... with regard to the theory of valency, since they indicate that the S = 0 bond is almost identical in both molecules. It seemed necessary, therefore, to investigate the spectra of SeO and SeOa in order to see whether such results are fortuitous or whether they are confirmed by the analysis of similar mole cules. Such an investigation appeared desirable also, from the point of view that the method of analysis of the spectra of polyatomic molecules has not made so much progress as could be wished for and the bands of formaldehyde! and sulphur dioxide are indeed the only ones, for which a complete vibrational analysis has been offered at the present moment. An extension to polyatomic molecules of the clearer insight into the constitution of diatomic molecules, afforded by band spectroscopy, seems to us essential in the present state of knowledge. E m issio n Spe c t r u m o f SeO Experimental-The spectrum of SeO has not been described in litera ture. Various methods of producing bands of SeO, however, suggest themselves. In analogy with SO the best method probably would be one of a discharge through a vacuum tube in running vapour of S e02 or with high pressure S e0 2 vapour. S e0 2 being a solid with rather a high melting point (340° C), such a method could not be adopted because of the want of a suitable quartz discharge tube and a suitable furnace. A glass discharge tube, with a quartz window for observation, containing
doi:10.1098/rspa.1936.0178 fatcat:62vg7vfkwnfxtnhasaqbkc74pi