journal article
LitStream Collection
Chemical Studies by Means of Molecular Beams. VIII. A Method of Measuring the Intensity of Potassium Atomic Beams with an Incandescent Tungsten Surface. Part 2
doi: 10.1246/bcsj.14.141pmid: N/A
In these experiments on the measurement of the intensity of potas？ium atomic beams with a tungsten ribbon, the following results have been obtained:(1) The ionization efficiency of adsorbed potassium atoms by flashing is found to be in good agreement with the calculated one, if the correct values of the work function and those of the contact potential of the tungsten surface are used.(2) Adsorbed potassium atoms begin to migrate on the surface of the ribbon when the latter is heated to 500–700 °C. This effect enables us to obtain a perfect ionization even with a concentration higher than θ=0.04.(3) A simple method of determining the heat of activation of the surface migration is proposed.From the above facts, it has been concluded that this method is the most suitable for measuring all at one time weak atomic beams of large cross sections.