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 lo 8 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, n, 461, 1918; Overn, Physical Review, 14, 137, 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 .17806 l,a l 1.2136 La., 1.0726 



Emission wave-length X io cm. 



Ko, .21341 Kaj .20860 K/3 .18420 



L4 1-4^39 La t 1.47306 



L^ 4 1.2985 L/3 t 1.27892 L/3 S 1.260! 



LY, 1.09608 Ly 2 1.0655 Ly 3 1.0596 



La s 1.024 



KA .17901 



LTJ 1.4176 



L0., 1.24193 



Ly 4 1.0261 



L/3 6 1.2040 



SMITHSONIAN TABLES. 



