Metastable atomic deuterium

In the experiment, illustrated in Figure 17, a 1-keV metastable atomic deuterium beam of density about 10" cm was produced by charge exchange, in cesium vapor, of deuterons extracted from a radio-frequency... 

Fig. 2. Recent measurements of the Rydberg constant by laser spectroscopy of hydrogen and deuterium. Data points A and B are derived from the wavelength of the Balmer-a [7] or Balmer-8 line [8], observed by quenching of a beam of metastable 2S atoms with crossed dye laser beams. Data C and D are obtained by Doppler-free two-photon spectroscopy of 2S-8..12S transitions, recorded by quenching of a metastable atomic beam [9,10]. The Rydberg values E and F have been measured by Doppler-free two-photon spectroscopy of the 1S-2S transition in a gas cell [11,12],...

H3+(D3+) + N. The ions were obtained from hydrogen or deuterium by electron bombardment [6, 8,10,11], by electric discharge [7], and in reactions with rare gas ions or metastable atoms [5, 9]. The tabulated rate constant determined with the flowing afterglow technique... 

The propene ion is one system in which determination of isotope effects is hampered by hydrogen randomisation. Nevertheless, deuterium isotope effects upon ion abundances following El have been obtained by making allowances for the extent of hydrogen randomisation [see Sect. 7.5.1(f)]. For hydrogen atom elimination, the isotope effect/H//D has been put at 1.7—2.0 for source reactions [372] and 2.3—3.0 and 3.6 (first and second field-free regions, respectively) for metastable ions [510]. For hydrogen atom elimination from propenoic acid ions, the isotope effect /H//D has been put at 4.3 for metastable ions [587]. 

N—S bond rupture was found to be competitive with loss of a hydrogen atom from the weak molecular ions of iV-alkanesulfonyl- and N-arenesulfonyl-dihydro-1,3,5-dioxazines 11276. Equation 31 summarizes the major common fragmentation paths, with postulated ion structures, as emerged from the occurrence of metastable ions, high-resolution mass measurements and deuterium labelling. 

U neutron, also known as deuterium), and (2 neutrons, also known as tritium). Anuclide is an elemental form distinguished from others by its atomic and mass numbers. Some nuclides, such as U and Cs, are radioactive and spontaneously decay to a different nuclide with the emission of characteristic energy particles or electromagnetic waves isomers of a given nuclide that differ in energy content are metastable (i.e., " Cd) and characterized in part, by the half-life of the isomer. 

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