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Gases evolving from the brass walls of the container resulted in gradually decreasing charging, which could be returned to the original value by pumping for several hours at 1 X 10-5 mm of mercury. These results indicate that this type of tribo-electric charging strongly depends on the gas layers adhering to the surfaces involved. The amorphous quartz particles might be expected, because of the differences in structure, to acquire charge in friction with crystalline quartz. Actually, however, there was greater charging when the amorphous quartz particles struck the amorphous quartz receiving bucket, which further sub- stantiates the belief that so-called "tribo-electric" series have little meaning. Since the piezo-electric contribution to the charging of the sand amounted to less than 20 percent of its total charge, when the crystal was strained by a force of nearly 5 X106 dynes, it seems evident that the piezo-electric effect is not an important factor in tribo-electrification. * This work was supported by ONR funds. 1 L. B. Loeb, Science 102 (No. 2658), 573 (1945). 2 Ernst Burkhardt, Zeits. f. Wirts. Zuckerindustrie 89, 244-79 (1939). 3E. W. B. Gill and G. F. Alfrey, Nature 163, 172 (1949). The K-Shell Internal Conversion Coefficients* M.
Physical Review – American Physical Society (APS)
Published: Dec 15, 1949
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