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  1. Cf. for example, Bureau of Standards Scientific Papers Nos. 400 and 403.
  2. The spectral changes at these potentials will be discussed in detail in a paper by Foote, Meggers, and Mohler, now in preparation.
  3. Duane and Shimizu, Phys. Rev. 14, p. 67; 1919.
  4. Horton and Davies, Proc. Roy. Soc., 98 p. 124, 1920.
  5. Sommerfeld. Atombau und Spektrallinien. Second Edition, p. 548.
  6. Recently Kurth has reported before the Physical Society results of experiments on characteristic X-rays from solids, by a photo-electric method. (Abstract Phys. R. 17 p. 528, 1921. Also Washington meeting of Am. Phys. Soc.) The same type of experiment was also carried out by us independently, with results which in some cases confirm the beautiful data of Mr. Kurth, and which will be extended and published later. The present work was undertaken to supplement this by using metals which are easily vaporized and also gases and non-metallic vapors. This is the first example of the excitation of x-rays in vapors. Many other observers have applied the photo-electric method in a search for low-voltage characteristic radiation from solids but without definite results. Millikan has been able to identify many x-ray lines of wave-length longer than 130 Å in "hot spark" spectra. His results in sodium were noted above. This method of photographing the lines directly over this narrow spectral range and the extreme end of the x-ray series greatly adds to the value of determinations in which the critical voltages have been observed. Note added Aug 8. Additional data are as follows: Chlorine 198 and 157 volts; Carbon 272 volts; Nitrogen 374 volts; and Oxygen 478 volts. The last three values are K limits.

Other

Cf. for example, Bureau of Standards Scientific Papers Nos. 400 and 403.

The spectral changes at these potentials will be discussed in detail in a paper by Foote, Meggers, and Mohler, now in preparation.

Duane and Shimizu, Phys. Rev. 14, p. 67; 1919.

Horton and Davies, Proc. Roy. Soc., 98 p. 124, 1920.

Sommerfeld. Atombau und Spektrallinien. Second Edition, p. 548.

Recently Kurth has reported before the Physical Society results of experiments on characteristic X-rays from solids, by a photo-electric method. (Abstract Phys. R. 17 p. 528, 1921. Also Washington meeting of Am. Phys. Soc.) The same type of experiment was also carried out by us independently, with results which in some cases confirm the beautiful data of Mr. Kurth, and which will be extended and published later. The present work was undertaken to supplement this by using metals which are easily vaporized and also gases and non-metallic vapors. This is the first example of the excitation of x-rays in vapors. Many other observers have applied the photo-electric method in a search for low-voltage characteristic radiation from solids but without definite results. Millikan has been able to identify many x-ray lines of wave-length longer than 130 Å in "hot spark" spectra. His results in sodium were noted above. This method of photographing the lines directly over this narrow spectral range and the extreme end of the x-ray series greatly adds to the value of determinations in which the critical voltages have been observed. Note added Aug 8. Additional data are as follows: Chlorine 198 and 157 volts; Carbon 272 volts; Nitrogen 374 volts; and Oxygen 478 volts. The last three values are K limits.

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