. Radiometric investigations of infra-red absorption and reflection spectra . cc 1- 3020 y A y ^^^ a A \ fr \ ■■^ ^ V^ a anc N b =BrC-Az uciteurite Mg (0^CuCC ), Cu (0H)2 \ V \ V b V \ \ \ \ 1 \ \ \ r V A c \ \ A p \ \ 10 \ /vl / \ f I I V 10 11 12 13 14 15/i Fig. 10. Gbthite^ FeO{OH). In appearance this mineral is opaque andblack with a metallic luster, and as a whole would not lead one tosuspect the fact that it is fairly transparent to 9 /x. It transmits about Absorption and Reflection Spectra. 467 20 per cent of the energy throughout this whole region, which is inmarked contrast
. Radiometric investigations of infra-red absorption and reflection spectra . cc 1- 3020 y A y ^^^ a A \ fr \ ■■^ ^ V^ a anc N b =BrC-Az uciteurite Mg (0^CuCC ), Cu (0H)2 \ V \ V b V \ \ \ \ 1 \ \ \ r V A c \ \ A p \ \ 10 \ /vl / \ f I I V 10 11 12 13 14 15/i Fig. 10. Gbthite^ FeO{OH). In appearance this mineral is opaque andblack with a metallic luster, and as a whole would not lead one tosuspect the fact that it is fairly transparent to 9 /x. It transmits about Absorption and Reflection Spectra. 467 20 per cent of the energy throughout this whole region, which is inmarked contrast with the ahnost complete opacity of iron. Thetransmission curve is given in Fig. 9, b. The 3 /i band is well marked, while a second one occurs at 9 specimen was kindly presented by Prof. S. L. Penfield. Bauxite^ Al^O{OH)^. In this mineral the 3 /x band is wide andcomplex. There are other bands at 4,7, , and 7/x. Curve <r, Fig. 9. Portland Cement. (Cur\^e <?, Fig. 11.) The chemical constitu-tion of Portland cement is unknown. According to LeChatelier ^. 9 10 11 1: 14 15/^ Fig. 11. the action of water causes the formation of a hydrous silicate,2 ().5H20, and a hydrous aluminate, From the curve shown it will be noticed that the substance isvery opaque, with a large absorption band at 3 />t, which would seem toindicate hydroxyl groups. From the curves of mellite and alumit appears that Portland cement is too transparent beyond 3 /a tocontain 17 molecules of water of crystallization, as indicated in theaforesaid formulae. Astcrite^ 2CuCOyCu{OH\. There are absorption bands at , LeChatelier: Annales des Mines, Feb., 1888. 468 Bulletin of the Bureau of Standards. [ Vol. 2, No. 3. , , and /i and complete opacity beyond ^. /x band is shifted slightly from the position common to sub-stances containing OH groups. Curve <r, Fig. 10. Brucite^ Afg{OH)^. In Pig. 10, curves a and b^ is shown thetransmission throug
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Keywords: ., bookauthorcoblentz, bookcentury1900, bookdecade1900, bookyear1906
