Publisher's Synopsis
Excerpt from Report on Photo-Electricity, Including Ionizing and Radiating Potentials and Related Effects, Vol. 2: Part 2; April, 1921
Comparatively little has been done on this subject since 1913, although it was obvious that the subject was very incompletely covered. The technical difficulties are very formidable. In the first place, most gases, if they can be ionized at all, require light of such short wave-length to effect ionization, that very special arrangements have to be made to secure the right kind of light. Fluorite, the most transparent of known substances, begins to absorb strongly just in the region of wave-lengths where ioniza tion of air begins. As it is desirable to have a window between the source of light and the ionization chamber, it becomes very difficult to find a window transparent to the active light. Another obstacle to securing reliable results is that in the region where the ionization of gases begins, the photo-electric effect of metals is enormous, and it becomes a problem how to disentangle the small ionization in the gas from the very large photo-electric effect Of the electrodes (even when apparently well shielded) which are generally necessary to separate the ions in a gas.
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