Results 291 to 300 of about 155,621 (344)
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Nuclear spectra of oxygen isotopes
Nuclear Physics, 1962Abstract The spectra of O17, O18, O19 and O20 are considered in the framework of the shell model. The low lying energy levels of these nuclei are found to be well described by jj-coupling configurations involving the 1 d 5 2 and 2 s 1 2 orbits.
I. Talmi, I. Unna
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Isotopic analysis of oxygen in water
The International Journal of Applied Radiation and Isotopes, 1958Abstract A semimicro method for the oxidation of water to oxygen for mass spectrometry has been developed. Water samples of 25–100 mg are oxidized by bromine in alkaline solution in presence of cobaltic oxide. Paзpaбoтaн пoлyмикpoмeтoдoкиcл eния вoды дo киcлopoдa для мacc-cпeктpoмeтpии Пpoбы вoды в 25–100 мг oкиcляютcя щeлo чным pacтвopoм бpoмa в ...
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Oxygen isotope geochemistry of zircon
Earth and Planetary Science Letters, 1994The high-temperature and small sample size of an I.R. laser system has allowed the first detailed study of oxygen isotope ratios in zircon. Low-magnetism zircons that have grown during metamorphism in the Adirondack Mts., N.Y. preserve primary δ18O values and low-magnetism igneous zircons are likewise primary, showing no significant affect due to ...
John W. Valley +2 more
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Nature, 1929
I HAVE recently been studying the vibrational energy functions of molecules, in connexion with a recalculation of heats of dissociation, and have noticed that the equation given by Dieke and Babcock (Proc. Nat. Acad. Sci., 13, 670; 1927) for the upper level of the atmospheric bands of oxygen has an unusually large coefficient for the n3 term.
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I HAVE recently been studying the vibrational energy functions of molecules, in connexion with a recalculation of heats of dissociation, and have noticed that the equation given by Dieke and Babcock (Proc. Nat. Acad. Sci., 13, 670; 1927) for the upper level of the atmospheric bands of oxygen has an unusually large coefficient for the n3 term.
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Oxygen isotope studies of achondrites
Geochimica et Cosmochimica Acta, 1996Abstract Oxygen isotope abundances provide a powerful tool for recognizing genetic relationships among meteorites. Among the differentiated achondrites, three isotopic groups are recognized: (l ) SNC (Mars), (2) Earth and Moon, and (3) HED (howardites, eucrites, diogenites).
Robert N. Clayton, Toshiko K. Mayeda
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Oxygen Isotope Composition of Trinitite Postdetonation Materials
Analytical Chemistry, 2013Trinitite is the melt glass produced subsequent the first nuclear bomb test conducted on July 16, 1945, at White Sands Range (Alamagordo, NM). The geological background of the latter consists of arkosic sand that was fused with radioactive debris and anthropogenic materials at ground zero subsequent detonation of the device.
Elizabeth C, Koeman +3 more
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Carbon and oxygen isotope microanalysis of carbonate
Rapid Communications in Mass Spectrometry, 2009Abstract Technical modification of the conventional method for the δ 13 C and δ 18 O analysis of 10–30 µg carbonate samples is described.
Tatiana A, Velivetskaya +2 more
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Isotopic analysis of oxygen in inorganic compounds
The International Journal of Applied Radiation and Isotopes, 1959A semimicro method has been developed for analyzing the isotopic composition of various inorganic compounds, includlng oxides, anions, and water. The samples are heated to 400 deg C with a mixture of HgCl/sub 2/ and Hg(CN)/sub 2/; the CO/sub 2/ formed is purified for analysis over zinc amalgam at 200 deg C.
M, ANBAR, S, GUTTMANN
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Geochimica et Cosmochimica Acta, 1951
Abstract Natural silicates vary in their O18/O16ratios by as much as 2–4%. This difference is largely due to an exchange reaction between silica and water during the processes of erosion and sedimentation, as a result of which sedimentary rocks are richer in O18 than are the igneous rocks. The temperature coefficient for the silica-water exchange has
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Abstract Natural silicates vary in their O18/O16ratios by as much as 2–4%. This difference is largely due to an exchange reaction between silica and water during the processes of erosion and sedimentation, as a result of which sedimentary rocks are richer in O18 than are the igneous rocks. The temperature coefficient for the silica-water exchange has
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