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If the cosmological term in the equations of relativistic mechanics is set equal to zero, it has been shown by Einstein that a non-static model of the universe filled with a homogeneous distribution of incoherent matter would expand to a maximum volume and then start contracting. This, however,...
With a metallic strontium arc in a hydrogen atmosphere as a source, high dispersion spectrograms of three groups of bands in the near infrared with main heads at 7020A, 7347A and 7508A have been obtained. Analysis shows that the latter two groups of bands constitute a Π 2 → Σ 2 system with...
Several specially designed Weston Standard Cells have been constructed and subjected to large hydrostatic pressures. The cell cases were made of glass, beeswax, or rubber and the e.m.f. measured at pressures from 1 to 12,000 atmospheres. Such pressures have the effect of increasing the e.m.f....
Intensity formulae are found for the rotational structure of bands arising from transitions between a singlet and a triplet state of a diatomic molecule. These intercombinations occur because the wave functions which diagonalize the orbit-spin interaction contain both singlet and triplet terms....
The absorption of helium excited at low voltages for its own lines, the 2 S 3 - 2 P 3 at 10830A and the 2 S 1 - 2 P 1 at 20582A, is determined. The percentage absorption of the 2 S 3 - 2 P 3 line increases when either the exciting current or the pressure in the absorbing tube is increased, and...
The infrared absorption spectra of C H 3 Cl, C H 3 Br, and C H 3 I, in vapor form, were measured from 1.5μ to 3.0μ. The fine structure of bands in the 2.3μ region was resolved in the first order. The fine structure of bands in the 1.6μ region was resolved in the second order, but not in the...
A group of bands (from v ′ = 7 to v ′ = 13 , v ′ ′ = 2 , 3 and 4 ) in the main absorption band system of bromine ( Br 2 7 9 , 8 1 ) have been analyzed and found to consist of P and R branches only. Branches of the less abundant molecules, Br 2 79 and Br 2 81 , showing alternating...
Intensity ratios for the doublets of the principal series, 2 s - m p 1 1 2 , 2 s - m p 1 2 , were measured by the photographic method, using a Pfund arc with silver poles. For m = 4 , 5 , 6 , 7 , the values obtained for a 1 2 ― a 2 2 ― were 4.4, 6.6, 6.0, 5.2, deviating substantially from the...
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