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The 0-0 and 1-0 Cameron bands of CO are investigated in absorption with high dispersion. Three P , three Q and three R branches are observed for each band. New accurate values for the rotational constants of the ground state of CO are derived: B e = 1.9310 cm - 1 , α = 0.01744 cm - 1 and, using...
The radiation observed in the presence of a source of fast neutrons is found to be due chiefly to the excitation of gamma-rays in the lead block used in these experiments. The true absorption of fast neutrons in several elements is less than previous measurements had indicated, and hence an...
The thin film field emission (Malter effect) from Al 2 O 3 films on Al was investigated (1) by coating the film with a fine dust of willemite and observing the behavior of the primary beam; (2) by forming an electron image of the surface by means of the Malter current from it. The behavior of...
X-ray measurements have been made with a vacuum ionization spectrometer on powdered nickel to determine the variation of the atomic structure factor in the region of the K absorption edge, λ = 1.4839 A , and as far out as possible on the long wave-length side. Powdered NaCl and LiF have been...
The characteristic K lines from a molybdenum target x-ray tube were scattered almost directly backward by helium gas at fourteen atmospheres in a chamber provided with a celluloid window. Entry and exit of radiation was provided through distinctly separate regions of the window to avoid window...
A final report is here made of a deflection determination using a new method described in a preliminary report (Part I). There are two fundamental advantages of this method over other free electron methods: (1) the accelerating voltage is not measured. In its place, the determination of the...
A beam of potassium atoms is scattered by an MgO crystal and the magnetic velocity analyzer used to determine the distribution in velocity of the scattered atoms. The resulting velocity spectrum agrees very well with that calculated on the assumption of a Maxwell distribution characteristic of...
A survey of the existing theories of photoelectric emission near the threshold shows that for ν ≪ ν 0 , I = const T n e h ( ν - ν 0 ) kT and for ν = ν 0 , I = const T n . Different theories demand values of n from 1/2 to 5/2. The usual method of comparing theory with experiment, by making...
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