. Radiometric investigations of infra-red absorption and reflection spectra . 12. 10 12 13 14 ^5^c ignition, but it is uncertain whether this water of constitution is dueto the presence of H or OH. There is no deep wide absorptionband at 3 /a, so that, judging by the present method of examination,there can not be any hydroxyl groups present. Curves c and d, , are for reflection. Serpentine, HJfMgFe^SiO^. In serpentine the water is chieflyexpelled at a red heat. From the curves of serpentine which showa large absorption band at 3 yu, if the results from the presentmethods of examination a
. Radiometric investigations of infra-red absorption and reflection spectra . 12. 10 12 13 14 ^5^c ignition, but it is uncertain whether this water of constitution is dueto the presence of H or OH. There is no deep wide absorptionband at 3 /a, so that, judging by the present method of examination,there can not be any hydroxyl groups present. Curves c and d, , are for reflection. Serpentine, HJfMgFe^SiO^. In serpentine the water is chieflyexpelled at a red heat. From the curves of serpentine which showa large absorption band at 3 yu, if the results from the presentmethods of examination are to be trusted, it would appear that thereare hydroxyl groups present. From the results obtained by Clarke Coblentz.] Absorption and Reflection Spectra. 469 and Schneider * it was inferred that the ]Mg is present as a and b^ Fig. 12. Talc^ H^Mg^Si^O^^. In talc water is expelled at a red the investigation of Clarke and Schneider (loc. cit.) nohydroxyl groups were inferred, and the transmission cun,^e does notshow a band at 3 /x. Curve <f, Fig. PerCent 30 10 r > A i 1 i ! i I V / a and c = Barite Ba! i 6 4Glauberite S04 jNa, S04C aSo, Afc 1 Curve c gives the Reflection i A i ; ii / I/? a i *,0 iLy^ M J 1 f 1 v^ ijn \ i 1, #r-- V: W V.^ 6 7 8 Fig. 14. 9 10 12 13 15/t Group III.—Miscellaneous Coinpounds. Sulphates. In Figs. 13 and 14 the transmission and reflectioncurves of the sulphates of strontium, lead, barium and sodium, and * Clarke and Schneider: Amer. Jour. Sci., 40, p. 308; 1890. 470 Bulletin of the Bitreau of Standards. L Vol. 2, No. J. calcium are given. Space will not permit discussing them at of them show harmonic bands at and ft as was noticedin anhydrite. The region of 6 to 7 /a is also characteristic of thesulphates, and as a whole there is sufficient evidence for attributingthese bands to the SO^ ion. II. REFLECTION SPECTRA. Reflecting Pozver of Metals. {Fig. ij.) The reflecting power of various metals and al
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Keywords: ., bookauthorcoblentz, bookcentury1900, bookdecade1900, bookyear1906
