X-ray Wave-Length Change by Partial Absorption

Abstract

The attempt to repeat the experiments of Mr. B. B. Ray in which a change in wave-length occurred in an x-ray beam upon passage through an absorbing substance, has been continued. In the previously reported experiments $\mathrm{Cu}K$ radiation was passed through absorbers of boron, beryllium, carbon, nitrogen and oxygen. These same absorbers have been retried with tungsten $L$ radiation with a spectrometer of greater dispersion. Although it should have been possible to observe a modified line of 1/3000 the intensity of the unmodified, in no case has any trace of a modified line been observed.