Výsledky vyhledávání - "Alvin J Cohen"

Correlation of Fe4+ optical anisotropy, Brazil twinning and channels in the basal plane of amethyst quartz

Publikováno v: Applied Geochemistry. 1:153-160

The biaxial absorption bands in amethyst quartz, with peaks at 2.28 eV and 3.54 eV related to Fe4+ and a peak at 3.02 eV—which is the A3 band related to the [AlO4]° trapped hole center, have orientations of maximum light absorption in the basal pl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::88dcf85711c0f4311370ad357ea0b195
https://doi.org/10.1016/0883-2927(86)90046-6

Zobrazit plný text záznamu

Interstitial Sn2+ in synthetic and natural cassiterite crystals

Autor: Alvin J. Cohen, J. I. D. Adekeye, Bruce Hapke, Deborah P. Partlow

Publikováno v: Physics and Chemistry of Minerals. 12:363-369

Evidence for the presence of Sn2+ in an octahedral interstitial site in synthetic and natural cassiterite (SnO2) is presented. The absorption and relative absorption spectral peaks measured are similar to ones found in Sn2+-doped KI by absorption spe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6b78147a3859c59f20295c1aefd7db86
https://doi.org/10.1007/bf00654347

Zobrazit plný text záznamu

Spectrophotometric estimation of gallium in the presence of aluminum

Autor: Alvin J. Cohen, Therald Moeller

Publikováno v: Analytica Chimica Acta. 4:316-321

A procedure for the estimation of small quantities of gallium in the presence of aluminum based upon precipitation of the element from hydrochloric acid-acetone solution with 5.7-dibromo-8-hydroxyquinoline and spectrophotometric examination of chloro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9ddd70a9c5bdce42f7ff00633cc0cf71
https://doi.org/10.1016/0003-2670(50)80045-4

Zobrazit plný text záznamu

Some characteristics of enstatite from enstatite achondrites

Autor: Arch M. Reid, Alvin J. Cohen

Publikováno v: Geochimica et Cosmochimica Acta. 31:661-672

Enstatite characteristics in enstatite achondrite meteorites, discussing mineralogy and composition

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8bdb204daf1c67d8d099c747aa35a924
https://doi.org/10.1016/0016-7037(67)90042-7

Zobrazit plný text záznamu

Ultraviolet and infrared absorption of fused Germania

Autor: Alvin J. Cohen, Herbert L. Smith

Publikováno v: Journal of Physics and Chemistry of Solids. 7:301-306

Fused germania (GeO2) contains an intense absorption band centered at 2445 A and caused by a reduced germanium species, probably Ge(II). This band has a half-width comparable to that of a band centered at 2429 A in certain fused silicas and produced

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f51926bd07a12f97c65845dcc951b46d
https://doi.org/10.1016/0022-3697(58)90281-6

Zobrazit plný text záznamu

Anisotropy of absorption bands in some lunar, meteoritic, and terrestrial pyroxenes

Autor: Alvin J. Cohen

Publikováno v: The Moon. 7:307-321

The optical anisotropy of individual spin-forbidden transitions of Fe3+ and Fe2+ ions and spin-allowed transitions of Ti3+ and of Fe2+ ions are observed in complex clinopyroxene crystals in lunar rock in both the pigeonite core and the augite overgro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::87f992c2294f85844a1c49634f0012b3
https://doi.org/10.1007/bf00564637

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání