Mode of occurrence, textural settings and nitrogen-isotopic compositions of in situ diamonds and other carbon phases in the Bencubbin meteorite
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We present a 650-year Antarctic ice core record of concentration and isotopic ratios (δ13C and δ18O) of atmospheric carbon monoxide. Concentrations decreased by ∼25% (14 parts per billion by volume) from the mid-1300s to the 1600s then recovered completely ...
American Association for the Advancement of Science (AAAS)1997
The presence of Zr isotope anomalies in the early solar system is demonstrated with the identification of Zr-92 excesses and Zr-96. deficits in several chondrites and the CAI Allende inclusions. The isotopic composition of Zr in carbonaceous, enstatite, an ...
Selective IR vibrational predissocn. (IRVP) of van der Waals clusters in a free jet is an effective way to sep. isotopes. Abs. sepn. factors a in excess of 1.1 were obsd. upon irradn. of a beam of SF6 dild. in Ar with a 20 W CO2 laser. Selection of the wav ...
The alcoholate-induced dehydrochlorination of styryl chloride possibly occurs by the 3 different competing mechanisms: E2, E1cb, and E1cb-HBA an E1cb modification. These conclusions were confirmed by H-D exchange, isotope effects, order of reaction, and re ...
Knowledge about the distribution of surfactants between aq. and reverse micellar phases as well as the assocn. of surfactants with proteins are of major importance for assessing the practical feasibility of protein extn. by reverse micellar systems. The qu ...
A threshold near 6.8 eV is obsd. for the dissocn. of H2O (and D2O) via the repulsive A(1B1) potential in rare gas matrixes. The threshold varies within 0.2 eV for exchange of Kr with Ar matrix, upon deuteration, and with temp. The observations are consiste ...
Isotope sepn. was demonstrated following the selective IR laser-induced photodissocn. of van der Waals clusters in a free jet. Irradn. of a natural abundance mixt. of SF6 isotopomers dild. in Ar with a 20-W cw CO2 laser gave overall enrichment factors >1.1 ...
