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008170728s1968    oncad   ob   f000 0 eng d
040 |aCaOODSP|beng
043 |an-cn---
0861 |aM38-8/75E-PDF|zM38-8/75
1001 |aFaye, G. H.
24514|aThe origin of pleochroism in erythrite |h[electronic resource] / |cG.H. Faye and E.H. Nickel, Mineral Sciences Division.
260 |aOttawa : |bQueen's Printer, |c1968.
300 |ap. [493]-504 : |bcharts, ill.
4901 |aReprint series ; |vRS 75
500 |aCover title.
500 |a"Reprinted from The Canadian Mineralogist, pp. 493-504, Vol. 9, Pt. 4, 1968."
500 |aHistorical publication digitized from print 2017 [by Natural Resources Canada].
504 |aIncludes bibliographical references.
5203 |a"Optical absorption measurements show that the pleochroism of erythrite is due to variations in the main absorption envelope in the 400 to 600-mμ region as crystallographically oriented sections are rotated in linearly polarized light. The absorption envelope arises from the 4T1 (F) → 4T1 (P) transition, with contributions from transitions derived from 2G and 2H levels, in octahedrally coordinated Co2+ ions, of which there are two kinds (CoI and CoII) in erythrite. The pleochroism is related to the interaction of the electric vector of light with electrons located in specific t2g orbital lobes of ions in the CoI and CoII sites. The validity of the present interpretation rests on the assumptions that erythrite is isostructural with vivianite and symplesite and that the principal optical directions are essentially coincident with the "molecular axes" of the Co2+-bearing octahedra"--Abstract, p. [493].
69207|2gccst|aMinerals
7001 |aNickel, Ernest H.,|d1925-
7101 |aCanada. |bNatural Resources Canada.
7101 |aCanada. |bDepartment of Energy, Mines and Resources.
7101 |aCanada. |bMines Branch.
830#0|aReprint series - Dept. of Energy, Mines and Resources, Mines Branch ;|vRS 75|w(CaOODSP)9.834843
85640|qPDF|s4.62 MB|uhttps://publications.gc.ca/collections/collection_2017/rncan-nrcan/M38-8/M38-8-75-eng.pdf