Abstract
DR. RUPP1 finds that if electrons of 80 kilovolts energy are reflected in succession from two gold surfaces at an angle of about one-third of a degree, there is a twelve per cent difference in the intensity of the twice reflected beam according as the two deviations are in the same or opposite directions. I have attempted to repeat this result for electrons scattered in succession through two thin gold films. The films were thin enough to give good ring patterns and the method is to measure photometrically the diffraction pattern formed by the twice scattered beam. The result is negative. Eight plates were taken, each with two exposures; the mean difference between the two sides for seven of these plates was 1 per cent. Of the individual pairs of readings, half differed by less than 5 per cent on the two sides, which corresponds to about 2 per cent probable error on the mean of the seven plates. The eighth plate gave a mean effect of 20 per cent in the reverse direction to that found by Rupp. I am unable to account for this plate, and as I have left Aberdeen, where the experimental work was done, I cannot attempt to repeat it. It is possibly due to uneven development.
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References
Zeit. für Phys., 61, p. 158.
Phys. Zeit., 31, p. 772.
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THOMSON, G. Polarisation of Electrons. Nature 126, 842 (1930). https://doi.org/10.1038/126842a0
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DOI: https://doi.org/10.1038/126842a0
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