General and physical chemistry

1911 Journal of the Chemical Society Abstracts  
iv]., 34, 801-S16).-The refractive indices of carbon monoxide and dioxide have been determined for six different wave-lengthe between the limits X = 6678 and X = 4471. Observations were also made on carbon suboxide, C,O" but this gas was admixed with a large proportion of carbon dioxide. H. M. D. Dispersion and Absorption of Chromium and M a n g a n e s e in the Visible and Ultra-violet Spectrum. VS~VOLOU FR~EDERICKSZ (Ann. Physik, 1911, [iv], 34, 780-796).-1n continuation of an investigation
more » ... an investigation of the optical constants of the metals, the author has determined the refractive and absorption indices of chromium and manganese by Voigt's method. Curves are drawu which show the variation of the optical constants with the wave-length of the incident light. H. M. D. Dispersion in Vapours of the Alkali Metals. PENRY V. REVAN (Proc. Roy. Soc., 1911, 85, A , 58-76. Compare Abstr., 1910, ii, 9 14).-Disporsion measurements have been made with sodium and rubidium vapours, and the dispersion curves have been drawn for several absorption lines. If attention be confined to the effects of dispersion near any single pair of lines, the constant of the dispersion formula appropriate to this line increases with the temperature of the vapour used. -4 relation cannot be found between the constants of different metals, as there is no evidence as to what temperatures should be chosen as corresponding temperatures. C. H. D. The G l o w Discharge and the Emission of the Alkali-M e t a l Vapours. GEORG GEHLHOFF (Ber. Deut. physikcd. Ges., 1 9 1 1, 13, 183-192. Compare Gehlhoff arid Rottgardt, hbstr., 1910, ii, 679).-Observations have been made relating to the nature of the glow discharge and of the emission spectra exhibited by tubes containing caesium vapour admixed with helium. The helium lines disappear from the spectrum of the positive glow at very small pressures of the cesium vapour. On the other hand, these lines are still evident in the spectrum of the negative glow when the pressure of the cEsium vapoiir has attained relatively high values. Experiments at different temperatures in which the partial pressure of the helium are kept constant have shown that the czsium lines of the principal and sub-series are exhibited by the positive glow. The negative glow spectrum shows the sub-series lines, and the lines of the spark spectrum brightly and the principal series lines feebly. When a spark gdp is introduced into the circuit, the principal and sub-series lines disappear from the spectrum of the positive glow. These and other observations support the author's view that the
doi:10.1039/ca9110005349 fatcat:rdnrncb2ejhkhpnckmys4ovbby