MECHANISMS OF ENERGY TRANSFER IN DIELECTRICS.
Final rept., 1 Nov 64-31 Jan 66,
NEW YORK UNIV N Y RADIATION AND SOLID STATE LAB
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The effect of X-rays on the electric behavior of organic materials was studied. A new method to determine charge production was used. It allows to measure the charge production after the exciting radiation and the external field were turned off it allows further to determine the effects of X-rays when only an internal field is present. Anthracene and polystryrene have been investigated so far. Contrary to the effect of excitation by light which produces charges at the interfaces of organic materials, X-rays produce charges only in the bulk. The production of one charge pair requires somewhat less than 8,500 eV, whereas only 100 eV are necessary for the light excitation of one molecule in its lowest excited state. Even with field strengths of several hundred-thousand volts per cm, saturation of the current was not obtained, contrary to observations with light where saturation was obtained with 10,000 volts per cm. The non-saturation of the current indicates that the positive and negative charges recombine with each other. Author
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