392 



Table 498 {continued). 

 X-RAY SPECTRA AND ATOMIC NUMBERS. 



Reference: Jahrbuch der Radioaktivitat und Elektronik, 13, 296, 1916. 



(d) Tungsten X-ray Spectrum (Wave-lengths, X X 10' cm). 



The wave-lengths of the tungsten X-ray spectrum have been measured more frequently than those of any other 

 element. The following values are perhaps the most accurate that have hitherto been published. Compton, Physical 

 Review, 7, 646, 1916 (errata, 8, 753, 1916). 



Other references on the X-ray spectrum of tungsten: Gorton, Physical Review, 7, 203, 1916; Hull, Proc. Nat. 

 Acad. Sci. 2, 265, 1916; Dershem, Physical Review, 11, 461, 1918; Ovem, Physical Review, 14, i37t 1919. 

 The following values for tungsten are from Duane and Patterson, Phys. Rev. 16, p. 526, 1920 : 



Critical Absorption wave-lengths X 10' cm. 



Ka .17S06 Ltti 1.2136 La2 1.0726 



Emission wave-length X 10' cm. 



Ka« .21341 



LI 1.67S6 



LP^ 1.2985 



Lyi 1.09608 



Laa 



Smithsonian Tables. 



