A brief review of established methods shows that only with the Berthelot technique is it possible to see a finite volume of liquid in sustained mechanical tension. A short discussion of the practice and theory reveals two uncertainties with the conventional technique : that of the determination of a true filling temperature, and the influence of compliance by the glass on the tension developed. A description is then given of a modified apparatus with which these difficulties do not arise. The tube is formed into a coil which deflects sufficiently to indicate internal pressure or tension, and by monitoring these deflections with a distance meter a record of pressure/ tension against temperature can be made. The course of a typical run is shown from which the excess pressure, filling temperature and limiting tension may all be estimated with much greater precision than befoie. The orders of magnitude of the results obtained are indicated, and a possible influence of non-uniform gaseous supersaturation is suggested.

Abstract. The influence of water molecule symmetry on hindered rotation has been investigated for H20-He,HzO(D20)-C02 systems, where CO2 molecule is treated as an atom. A strong coupling model has been used for calculating the energy spectra. The eigenfunctions of Morse oscillator and asymmetric top have been used as a basis set. The results show that experimentally observed effect of spin-selective water vapour codensation may be explained by the differences between binding energies of para-and orthomodifications for H20(DzO) molecules.PACS: 34.50.I This is precisely the reason for unequilibrium spinmodification distribution of H2 (D2) molecules in free jet expansion [6,7]. From this viewpoint it is interesting to understand why CO2-HzO (D20) dimers are formed mainly with that water molecule modification which contains ground rotational state (for H20 this is the para-and for D20 this is the orthomodification) [8,9]. This property of water molecules manifests itself not only under heterogeneous condensation [8,9] but under adsorbtion as well [10,11].It is the aim of this work to explore an effect of water molecule symmetry on hindered rotation in atom-molecule van der Waal complex.

Oxynitride films were formed on a hydrogen-terminated Si wafer and on a 2 nm Si oxide film wafer using nitrous oxide, nitric monoxide, and ammonia as nitrogen sources in a vertical furnace with a vacuum load-lock function. Thickness of the oxynitride films and their chemical depth profiles were studied by ellipsometry, angle-resolved X-ray photoelectron spectroscopy (AR-XPS), and secondary ion mass spectrometry (SIMS). Results revealed that the majority of nitrogen in oxynitride films is unevenly distributed at the interface between the Si wafer and the oxide film. The dissociation energies of the nitrogen sources were evaluated using the density functional theory. Nitrogen concentration was found to be related to the nitrogen sources in the following order, ammonia > nitric monoxide > nitrous oxide, which is the order of the dissociation energies of the nitrogen sources where ammonia exhibited the smallest dissociation energy and nitrous oxide the largest.

No abstract

No abstract