[en] Small samples of ⁶LiD was prepared and polarized using techniques which include: creation of F-centers by irradiation with 3 MeV electrons; dynamic polarization in a magnetic field of 6.5 Tesla. The result obtained is a polarization of ⁶Li and ²D nuclei of about 70%

[en] Polarizations exceeding 70% have been obtained in a sample of ⁶LiD, for the nuclear spins of lithium and deuterium. These results make ⁶LiD a polarized target material which outperforms all other materials tried so far

[en] Polarizations exceeding 70% have been obtained in a sample of ⁶LiD, for the nuclear spins of lithium and deuterium. These results make ⁶LiD a polarized target material which outperforms all other materials tried so far

No abstract available

[en] Four theoretical models are coupled to describe the variables of state of lithium-deuterium from the solid state to the plasma region. (Auth.)

[en] An experiment on neutron detection during lithium deuteride hydration in heavy water using a system of SNM-17 or SNM-18 gas counters was set up. Signals were simultaneously detected by 6 counters and the data were stored in a computer. At the same time the temperature of the reaction ampule external surface was measured. It was found that the neutron number per 1 gram of lithium deuteride reacted with water in the ampule was equal to several dozens if their initial energy was about 2.5 MeV. 4 refs.; 2 figs

No abstract available

[en] A theoretical result is reported for the deuterium electric field gradient (DEFG) of the LiD molecule. The calculation is based on an LCAO MO SCF function proposed by Ransil. First the expectation value of the DEFG operator is evaluated with respect to the wave function. Then, a corrected value is derived by means of a variation perturbation method developed by Hameka and Svendsen. The zero-order value of q/sub a/(el) is -0.1615 au and the corrected value is -0.1644 au; the experimental value is 0.169 au +/- 1%. The agreement between theory and experiment is satisfactory, especially since the theoretical value is derived for a fixed nuclear separation and the experimental value refers to a vibrating molecule. The extension of this method to calculate DEFG values for larger molecules is suggested as an aid in understanding hydrogen bonding

[en] The first phase of this investigation involved the construction of a perfect pairing valence-bond (VB) quantum mechanical potential-energy surfaces for the (H₂D₂) system to compare its results for various geometries to the other prior formulations of such. A plausible four-body pathway for the H₂--D₂ exchange reaction as shown by a semiempirical Huckel method was explored by the current valence-bond procedure. The second phase of the present investigation involves the formation of a VB based potential-energy surface for the LiH + H → Li + H₂ and LiH + D → LiD + H reaction systems for geometries compatible for a three-center reaction mechanism. No energy acceptable four-body reaction pathway was found for the H₂--D₂ exchange system. Good agreement was demonstrated with previous ''ab initio'' configuration interaction (CI) studies for the various geometries tested. The square configuration for the H₄ system yielded the lowest barrier height of all the four-body geometries tested although it was still considerably higher than the experimental activation energy for the (H₂,D₂) system. The barrier height energy for the linear LiH--H configuration agreed well with the one previous work on this system. The barrier height for the LiH--H system increases as the Li--H--H bond angle decreases from 180⁰ to 90⁰ as well as the Li--H distance at the saddle point. The VB method used herein showed markedly good comparison with recent full CI calculations on the lithium-hydrogen system especially in view of the very limited basis set used in the VB procedure

[en] Measurements of deuterium retention in samples of lithium exposed in the liquid state to deuterium plasma are reported. Retention was measured as a function of plasma ion dose in the range 6x10¹⁹-4x10²² D atoms and exposure temperature between 523 and 673 K using thermal desorption spectrometry. The results are consistent with the full uptake of all deuterium ions incident on the liquid metal surface and are found to be independent of the temperature of the liquid lithium over the range explored. Full uptake, consistent with very low recycling, continues until the sample is volumetrically converted to lithium deuteride. This occurs for exposure temperatures where the gas pressure during exposure was both below and slightly above the corresponding decomposition pressure for LiD in Li. (author)