Deuterium heavy hydrogen

An isotope that is used extensively is deuterium (heavy hydrogen), often in the form of a deuteromethyl (-CD3) group. The molecular weight of this compound is thus three Da higher than the unlabelled precursor and this is often sufficient to ensure that the ions in the molecular ion region of the unlabelled compound do not occur at the same m/z ratios as those from the labelled molecule. 

In a much-publicized study in 1989, Pons and Fleischmann claimed to have observed cold fusion of nuclei of deuterium (heavy hydrogen, D) within palladium electrodes that were being used to electrolyze D2O. Had this been the case, what other electrode materials might also have shown the same phenomenon ... 

DEUTERON. The nucleus of deuterium (heavy hydrogen l is known as deuleron. A particle that contains one proton and one neutron also is termed a deuleron. 

At this point we do not need to know the chemistry of these compounds, or even what structure a particular collection of letters (—COOH, say, or —-CH2OH) stands for we can tell when atoms or groups are the same or different from each other, and whether or not a model can be superimposed on its mirror image. Even two isotopes of the same element, like prottum (ordinary hydrogen, H) and deuterium (heavy hydrogen, D) are different enough to permit detectable isomerism ... 

Urey, Harold Clayton (1894-1981) US physical chemist, who became a professor at the University of California in 1958. His best-known work was the discovery of deuterium (heavy hydrogen) in 1932, for which he was awarded the 1939 Nobel Prize for physics. 

Urey, Harold Clayton (1893-1981) American chemist who discovered deuterium (heavy hydrogen), the isotope of hydrogen that has a neutron and a proton in the nucleus and is thus twice the weight of common hydrogen, which has only a proton. Urey also worked with Stanley Miller to simulate a primitive atmosphere, thought to be similar to Earth s early atmosphere. Urey was awarded the Nobel Prize in chemistry in 1934. 

We notice that by increasing the pressure Pa while keeping Pb constant we should see a succession in the first three cases. This is what is observed in the reaction between ammonia and deuterium (heavy hydrogen) on iron, as shown by the rate variation curves in Figure 13.5 with the partial pressures of ammonia and deuterium. 

The Copernicus satellite also made the first direct observations of deuterium ( heavy hydrogen ) in the interstellar medium, both in atomic form and in the molecule HD (Fig. 19). Accurate knowledge of the ratio of D to H in the interstellar gas is of relevance to theories of the origin and evolution of the universe. 

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