The Mechanisms of clean up of carbon monoxide and generation of carbon dioxide in getter ion pumps of various cathode materials are investigated with an ultrahigh vacuum mass spectrometer. In order to obtain detailed information on the pumping action of getter ion pump for active, gases, the adsorption and oxidation of carbon monoxide on palladium films evaporated onto glass in ultrahigh vacuum are observed by the same means. From the results, it is concluded that the dissociation of carbon monoxide molecules by the Penning discharge and the surface reaction on sputtered metal films are the principal factors for the clean up of carbon monoxide by getter ion pump.
The studies on the permeation of helium, neon and hydrogen through Hisilex which is a glass similar to Vycor have been made with a mass spectrometer. The obtained permeation rates of these gases through Hisilex are expressed as <5±10-7> exp (-Q/RT) which agrees well with Altemose's <4.8±10-7> exp (-Q/RT) for the rate of helium permeation through glasses. The fact that the pre-exponential factor does not depend on the kinds of gas and glass means that gases permeate with the same process through glasses. Then, if the activation energy Q is known, the permeation rates of gases through glasses are generally calculated. It is shown that the activation energy Q depends on the van der Waals' diameter of permeat-ing atoms and molecules. From this relation, the value Q for the case of any gas through any glass can be estimated. The permeation process is discussed and it is concluded that the steric factor is about unity and 1±10-3 for rubber and glass, respectively, and the diffusion in them is the rate determining step for the gas permeation.
Thin films of Ni ferrite and Ni-Zn ferrite are prepared by flash evaporation of ferrite particles and subsequent simple oxidation in an open electric furnace. The films are evaporated in a vacuum of 2±10-5 mmHg onto substrates of glass and fused quartz plates maintained at room temperature. They are about from 500 to 14000Å in thickness. Their crystal structures and magnetic properties are carefully xvamined at each stage of oxidation process by electron diffraction and ferromagnetic resonance measurements, respectively. These results show that evaporated films are hardly composed of ferrite, so they had to be oxidized. Films of spinel structure are obtained by oxida-tion at 700°C for 8 hours in Ni ferrite and at 300°C for 4 hours or at 700°C for half an hour in Ni-Zn ferrite. In these films, saturation magnetization (4πMs) varies from 2200 to 2600 Gauss and g-factor from 2.21 to 2.24 in Ni ferrite, and 4πMs from 3200 to 4700 Gauss and g-factor from 1.98 to 2.14 in Ni-Zn ferrite. The half widths of the resonance ΔH_??_ and ΔH_??_ are measured by apply-ing d. c. field H perpendicular and parallel to the film plane, respectively. ΔH_??_ varies from 600 to 1000 Oe in Ni ferrite and from 400 to 1000 Oe in Ni-Zn ferrite, and ΔH_??_ from 640 to 1000 Oe in Ni ferrite and from 400 to 800 Oe in Ni-Zn ferrite. The granular state of the film is examined electron microscopically.
The evaporation process of titanium in a U. H. V. system (10-9 Torr) is investigated in details. Electron diffraction and electron microscopic studies are made on the structure and epitaxial growth of titanium films deposited on heated cleaved faces of rock salt and mica. The epitaxial relations (0001)Ti_??_(001)NaCI and (3034)Ti_??_(001)NaCI are observed on the films evaporated in U. H. V. The titanium films evaporated in high vacuum (10-5 Torr) changed to titanium carbide in a few minutes.