Oxygen, impurities

Re-crystallization also leads to a significant reduction in the level of carbon and oxygen impurities however, the reduction of cationic impurities is usually not efficient. To prevent co-precipitation of complex fluorotantalates of polyvalent metals, some suitable complexonates are added to the solution. 

The ion yields of 02+ arising from 3.3 X 10 2 mole % oxygen impurity in the gas are not shown since its contribution at maximum pressure is less than 3%. % Ion yield refers to % total ions observed... 

Termination was through reaction with trace oxygen impurities, H(D) + 02 H(D)02. Later, it was realized that most chain carriers are ions, and the following mechanism was established after the initial reaction (5.1) or its D equivalent ... 

A special attention is to be devoted to copper, which is very often used in a cryogenic apparatus. The low-temperature specific heat of copper is usually considered as given by c = 10-5 T [J/g K], However, an excess of specific heat has been measured, as reported in the literature [59-69], For 0.03 K < T< 2K, this increase is due to hydrogen or oxygen impurities, magnetic impurities (usually Fe and Mn) and lattice defects [59-66], The increase of copper specific heat observed in the millikelvin temperature range is usually attributed to a Schottky contribution due to the nuclear quadrupole moment of copper [67,68],... 

Oxygen heterocyclics, 10 567 Oxygen-hydrogen mixtures, 13 770-771 Oxygen impurities, in argon separation,... 

Nitrides, Phosphides, and Arsenides. The phase diagram for the Cr-N system between 900 and 1350°C has been constructed and thermodynamic relationships in this system have been calculated. These latter studies indicated the extreme sensitivity of the kinetics of Cr-N reactions to oxygen impurity. ... 

G = —13.6) for electron irradiation in a stream of nitrogen. He attributed the difference in rates of destruction to electron capture by the oxygen impurity in the nitrogen, resulting in longer lifetimes for ionized species and increased yields. 

Since isomerization, in general, is not characteristic of the Wilkinson catalyst, it is believed to be caused by a small amount of oxygen impurity.29... 

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