Dynamics of D2 released from the dissociation of D2O on a zirconium surface.

Hydrogen is efficiently released during water dissociation on zirconium (Zr), while even very rapid temperature programmed heating of a hydrogen covered Zr surface predominantly leads to dissolution (approximately 99% dissolution). To help resolve these apparently contradictory observations, we have studied the dynamics of water (D2O) dissociation on a crystalline Zr surface by probing the rotational and vibrational energy distributions of the D2 produced using resonant enhanced multiphoton ionization spectroscopy. The internal-state energy distribution of the D2 product was found to be rotationally cold and vibrationally hot with respect to the temperature of the surface. The rotational distribution shows slight deviations from Boltzmann's law, with a mean rotational temperature of 426 K while the surface is at 800 K. The population of the nu"=1 vibration is at least four times higher than a 800 K temperature would allow, this corresponding to a vibrational temperature of 1100 K. Information on the translational energy of the D2 product have also been obtained by time-of-flight spectroscopy and it is found to be nearly thermally equilibrated with the surface temperature. Similar results were obtained from studies of D2 scattered from a clean Zr surface, and of D2 released by a slow thermal desorption process which involves dissolved hydrogen as the source. The reconciliation of the present results with those for thermal desorption of preadsorbed hydrogen implies a role for both surface and subsurface adsorption sites on the Zr surface and clearly demonstrates that at high temperatures, the release of D2 arises from the recombinative desorption of adsorbed hydrogen formed by the complete dissociation of D2O.

Triplet electronic states in d(2) and d(8) complexes probed by absorption spectroscopy: a CASSCF/CASPT2 analysis of [V(H2O)6]3+ and [Ni(H2O)6]2+.

Octahedral complexes of transition metal ions with d(2) and d(8) electron configurations have triplet electronic states with identical T(2g), A(2g), T(1g)((3)F), and T(1g)((3)P) symmetry labels. CASSCF and CASPT2 calculations indicate the predominant electronic configurations for each triplet state. The two (3)T(1g) states show strong configuration mixing in the d(8) complex [Ni(H(2)O)(6)](2+), but much weaker mixing occurs between these states in the d(2) compound [V(H(2)O)(6)](3+). Calculated vibrational frequencies and equilibrium geometries for the triplet states are used to obtain theoretical absorption spectra that are in agreement with the experimental data.

[Schizophrenia, special approach and continuity of care : The first episode program of Hôtel-Dieu Hospital in Lévis, Québec.]. / Schizophrénie, approche spécialisée et continuité de soins. Le programme spécifique d'intervention Premier-Episode de l'Hôtel-Dieu de Lévis.

Schizophrenia is a complex illness with an evolutive character. Based on a conceptual framework of cognitive orientation, the specific intervention program First Episode of Hôtel-Dieu in Lévis includes a complete and standardized assessment to an individualized and family plan. Different methods of treatment acording to an individualized approach (psyhco-education, psychotherapy) as well as group therapy (psychological intervention at the cognitive level or Brenner's Integrated psychological therapy) are then proposed. Psycho-education intervention for families is also offered. Structures and different steps described here, harmonize with those already in place before the program's creation thus offering a continuity in care. The underlying conceptual framework and the different methods of functioning of the program are also presented.

[Very-high-dose droperidol and brain stem injuries]. / Dropéridol a très haute posologie et traumatismes du tronc cérébral

Treating four comatose children with severe injuries of the brain stem, suffering from severe autonomic disorders without any indications for neurosurgery, we were led to increase gradually the doses of neuroleptics used as basis of treatment, the main one being Droperidol. The increase in dosage, often reaching very high doses, was rendered necessary owing to a phenomenon comparable to that of addiction, a steadily increasing dose was necessary each day to obtain the same beneficial effects of autonomic stabilization. A complete cure was obtained on each occasion, at the end of a coma varying between 20 days and two and a half months. The extreme case was the last case in which we were led to give in a single day, 7 grams of the drug to a 12 years old child, who completely recovered his motor and intellectual functions after a coma lasting thirty five days. Comparison of the four cases led us to suppose that the result is all the better when treatment with neuroleptics is started soon after the accident, in low dosage but regularly increased without fixing any other ceiling than the effect obtained, the toxicity of Droperidol seemed to us very low, even in very high dosage, provided the conditions of gradualness are respected. Although it is classical to say that the prognosis of trauma of the brain stem is more favourable in children than in adults, we are certain that such treatment contributed considerably to avoid a fatal issue or chronic invalidism.