Efficient filament sources of ions of the alkali metals have been produced by heating synthetic alkali aluminum silicates. Studies of emission of the lithium sources as a function of composition reveal that the silicate 1 Li 2 0 : 1 AI2O3 : 2 Si02 is the most satisfactory ion emitter. Similar sources of the other alkalies prove stable and copious. Ions of Mg, Ca, Sr, Ba, Al, Ga, In, Ti, V, Mn, Y, and Ce, are emitted when the oxide of the metal in question is heated to a white heat on a tungsten filament. The 0 2~ peak observed by Barton has been checked. In the case of aluminum, negative ions of mass 27-presumably Al~-were observed.

Absorption spectrograms have been made of the gaseous system N2O5–O3 during the decomposition of the ozone and into the subsequent decomposition of the N2O5, placing these in time such that one was taken when the system consisted essentially of only N2O5 and oxygen. From such spectrograms as the last mentioned, the absorption coefficient, α10, of N2O5 has been measured over the wave-length range 3800–2850A. The value rises steadily from approximately 0.002 at the first wave-length to approximately 0.52 at 2850A. The absorption coefficient curve continues to rise to shorter wave-lengths and qualitative observations indicated no maximum as far as 2400A. No absorption which could be attributed to N2O5 could be observed in the 4500A region. Absorption spectrograms of NO3 in the visible are given. In a study using low dispersion of the influence of oxygen on the absorption spectrum of NO2, no noticeable effect was observed.

No abstract

Absorption maxima occurring in the near infra-red spectra of phenol and seven of its halogen derivatives have been measured and interpreted as combination frequencies in which the valence vibration of the OH group combines with frequencies of the body of the molecule. Certain of these absorptions underlie some of the trans-peaks of the orthohalogen phenols causing such a trans-peak to appear of larger area than that due to the trans-peak alone. A group of the combination frequencies which lie in the range 1000–1600 cm—1 above the first overtone OH absorption have been observed as a group of an order of magnitude weaker intensity in the frequency range twice the values above the first overtone OH and also above the fundamental OH absorption, apparently involving two units of vibration in the combining frequencies. A close correspondence is found between the frequencies involved in these combination tones and the frequencies which have been observed in some of these compounds in the deep infra-red and in Raman spectra.

Orthohalogen and symmetrically trihalogen substituted phenols in the region of the second overtone of the OH absorption show behavior that is similar to that in the region of the first overtone but with increased displacement of the component absorptions. Subsidiary peaks are observed in the region of the second overtone and appear to stand in ordered relation to the principal peaks. In the present work the ortho- and symmetrically trichloro-, bromo-, and iodophenols as well as pentachlorophenol and phenol itself have been studied in carbon tetrachloride solution. The tendency of phenol to associate in a series of polymers has been studied by means of the phenol absorption. Relative to phenol the association of the above-mentioned substituted phenols is small.