Tables 452-455 

 INFRA-RED TRANSMISSION AND ABSORPTION 



TABLE 452. — Per Cent Transmission, Gases, 6.7 to 32. 8^ 



(Strong, Phys. Rev.. 37, 1565, 1931, restrahlung.) 

 Length of cell, 4 inches. 



393 



Material Pressure 6.7/1 8.7/1 



NH3 760mm 24 26 



C 2 H 2 760 95 92 



H 2 S 760 97 98 



S0 2 760 98 5 



C 6 H 6 96 65 97 



CCU 114 95 99 



CS 2 361 30 98 



CHCI3 200 93 90 



(C 2 H B ) 2 ... 526 17 6 



20.75/1 22.9/1 27.3M 29.4M 



79 

 99 

 98 



7 

 102 



97 

 100 



99 

 61 



93 

 101 



97 

 58 

 99 

 99 

 86 

 98 

 45 



83 

 101 



92 

 100 

 100 



99 



98 

 98 

 69 



82 

 100 

 90 

 100 

 98 

 99 

 99 

 97 

 71 



32.8/i 

 62 

 98 



83 

 96 



95 

 9i 

 96 



97 

 61 



TABLE 454. — Per Cent Reflection, Solids, 22.9 and 32.8 M 



Description of reflector 22. 9m 



Deposit of MgO from burning Mg ribbon o 



Reflection 0-MgO 80 



Mica 32 



Paraffin 04 



Pencil mark on paper 09 



!Soot coating 43 



ZnO coating 01 



Optical black 31 



Gold foil blackened with bismuth > 19 



KBr -f- 1 -5m CaF 2 deposited by evaporation 10 



KI + 1.5/x CaF 2 deposited by evaporation 13 



32.8m 



o 

 33 



48 

 9i 

 52 



TABLE 455.— Per Cent Transmission, Various Substances, 20 to 130 M 



(Barnes, Phys. Rev., 39, 562, 1932, which see for special technique used for analysis in this region.) 



Fused quartz. . . . 



Crystal " |'|. . '. 

 Sulphur, rhombic 



Paraffin 



Mica 



Cellophane 



Celluloid 



Black paper 



Camphor soot . . . 

 Pfund Bi black. . 

 Lampblack, 

 water glass. . . . 



0.2 mm 

 1.0 " 

 1.0 " 

 0.9 ' 

 2.0 " 

 6m 

 40^ 

 Im 

 0.1 mm 



o.8f 



So 



60 70 



90 IOO IIO 120 I30M 



o o 2 20 35 51 53 52 .. .. 



o o o o o o 5 618 30 



o 1 7 42 57 62 59 72 71 78 



30 40 10 6 39 3,7 52 58 51 56 



19 35 42 51 58 64 65 75 85 79 



6 18 50 53 46 57 50 21 27 50 (55) (55) 



o 16 22 23 24 24 23 23 29 30 



92 93 95 96 96 97 97 98 98 99 



2 5 13 19 22 23 26 



60 76 79 80 81 82 84 85 86 87 



30 40 44 48 50 40 45 58 60 57 



o (0 (3) 



12 21 20 26 30 25 30 30 



* On celluloid im thick, t For Rubens, Hoffmann, lampblack-water-glass mixture see Berliner Ber. 424, 

 1922. For Pfund's Bi Black see Rev. Sci . Instr., 1 , 397, 1930. A considerable number of bands appear in some of 

 the curves from which the aboye values were read. 



Smithsonian Tables 



