296 



Tables 354-355. 



OPTICAL CONSTANTS OF METALS. 



TABLE 364. 



Metal. 



Al.* 

 Sb.* 

 Bi.tt 

 Cd.* 

 Cr.* 

 Cb.* 

 Au.t 



I. crys. 



Ir.* 



Fe.§ 



Pb.* 

 Mg.* 

 Mn.* 

 Hg. (liq.) 



Fd.* 

 Pt.t 



Ni.* 



0.589 



589 

 white 



589 

 579 

 579 

 257 

 441 



589 

 589 

 579 

 257 

 441 



589 

 589 

 5S9 

 579 

 326 

 441 



589 

 668 



579 

 257 

 441 



589 

 668 

 275 

 441 

 589 



1.44 



3-04 

 2.26 



1-13 



2.97 

 1.80 

 0.92 

 1. 18 

 0.47 



3-34 

 2.13 



I.OI 



1.2S 



i-Si 

 2.01 



0-37 

 2.49 

 0.68 



I.OI 



1.62 

 1.72 

 1.62 

 1. 17 

 1.94 

 2.63 

 2.91 

 1.09 

 1. 16 

 1.30 



5-32 

 4.94 



5.0X 



4-85 

 2. II 

 1. 14 



1.85 

 2.83 

 0.57 

 4.87 

 0.88 

 1-37 

 1.63 

 348 

 4.42 



3-89 

 2.26 

 342 

 441 

 4.70 

 341 



3.16 



3-54 

 3.66 

 1.16 

 1.23 

 1.97 



R. 



83 

 70 



85 

 70 



41 

 28 

 42 

 82 

 30 

 75 

 16 

 28 



33 

 62 



93 

 64 

 66 

 74 

 75 

 77 

 65 

 37 

 58 

 59 

 59 

 24 

 25 

 43 



Ref. 



Metal. 



Rh.* 

 Se.J 



Si.* 



Na. (liq.) 

 Ta.» 

 Sn.* 

 W.* 



v.* 



Zn.* 



M 

 0-579 

 400 

 490 



589 

 760 



589 



25 



25 



589 



579 



589 



579 



579 



257 



441 



589 

 668 



1.54 

 2.94 

 312 



2-93 

 2.60 

 4.18 

 3-67 

 3-53 

 .004 

 2.05 

 1.48 

 2.76 

 3-03 

 0-55 

 0-93 

 1-93 

 2.62 



Ref. 



A =: wave-length, n = refraction index. 



k = absorption index, R:= reflection. 



(i)Drude, see Table 205; (2) Kundt, prism 

 used, Ann. der Physik und Chemie, 34, p. 477, 

 36, p. 824, 1889; (3) V. Wartenberg, Verh. 

 deutsch. Physik. Ges. 12, p. 105, 1910; {4) 

 Meier, Annales der Physik, 10, p. 581, 1903; 

 (5) Wood, Phil. Mag. (6), 3, 607, 1902 ; (6) 

 Ingersoll, see Table 205. 



* solid, t electrolytic, | prism, § deposited 

 as film in vacuo. 



Coblentz, Bulletin Bureau of Standards, 2, p. 457. 1906, 7, p. 197, 1911. The surfaces of some of the 

 simples were not perfect so that the corresponding values have less weight. The methods for polishing 

 the variou* metals are described in the original articles. The following more recent values are given 

 by Coblentz and Emerson, Cul. Bur. Stds. 14. P. 207, 1917; Stellite, an exceedingly hard and untarnish- 

 able alloy of Co, Cr, Mo, Mn, and Fe (C, Si, S, P) was obtained from the Haynea Stellite Co, Kokomo, 

 Indiana. 



Wave-length, /t, .15 



Tungsten, — 



Stellite, .~2 . 



Smithsonian TABLca. 



' 



