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  • 1
    Electronic Resource
    Electronic Resource
    Microbore high-performance liquid chromatography/Fourier transform infrared interface for normal- or reverse-phase liquid chromatography (1985)
    s.l. : American Chemical Society
    Analytical chemistry 57 (1985), S. 1969-1974 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00286a041
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal Structure of Benzene: a New Type of Systematic Error in Precision X-Ray Crystal Analysis (1955)
    [s.l.] : Nature Publishing Group
    Nature 175 (1955), S. 766-766 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have carried out, on the University of Manchester electronic computor, five cycles of refinement of the anisotropic thermal parameters of the carbon atoms, and find that the mean values of the components of the atomic temperature-factor B are: Perpendicular to the plane of the ring 4-8 x 10-" ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/175766a0
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal Structure of Benzene at −3° C. (1954)
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 75-75 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Adjustments to the carbon atom co-ordinates of the original analysis were first made by a Fourier transform method and by plotting difference projections on (100) and (001). The process was completed by five cycles of three-dimensional refinement on the University of Manchester electronic computor, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/173075a0
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  • 4
    Electronic Resource
    Electronic Resource
    Nuclear quadrupole resonance spectroscopy (1977)
    [s.l.] : Nature Publishing Group
    Nature 270 (1977), S. 663-663 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Fourth International Symposium on Nuclear Quadrupole Resonance Spectroscopy was held on 13-16 September, 1977 at the Takarazuka Hotell, near Osaka, Japan. The local Chairman was Professor H. Chihara of Osaka University. THESE symposia review progress in a branch of radiofrequency spectroscopy ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/270663a0
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  • 5
    Electronic Resource
    Electronic Resource
    Hydrogen Bonding in Calcium Orthophosphates (1962)
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 1090-1091 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In dicalcium 6is(dihydrogen phosphate) mono-hydrate3, Ca(H2PO4)2.H2O, we find that the distances between oxygens in phosphate groups which we believe to be hydrogen-bonded cover the range from 2-48 0-03 A to 2-87 0-05 A with infra-red peaks at 2,320, 2,430, 2,670, 2,920, 3,160, and 3,450 cm-1. In ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1951090a0
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  • 6
    Electronic Resource
    Electronic Resource
    Spectral studies of products of reaction between phosphorylacetaldehyde thiosemicarbazones and bromoacetal (1996)
    Springer
    Chemistry of heterocyclic compounds 32 (1996), S. 721-727 
    Details
    ISSN: 1573-8353
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We have obtained thiazoline hydrobromides by reacting unsubstituted thiosemicarbazones of phosphoryl-acetaldehydes with bromoacetal. These thiazoline hydrobromides have the structure of the azine of phosphorylacetaldehyde and 1,3-thiazoln-2-one in the crystal phase. Their dissolution is accompanied by thiazoline-thiazole tautomeric conversion to the hydrobromide of phosphorylacetaladehyde thiazolylhydrazone. Reaction of the 2-methyl-substituted phosphorylacetaldehyde thiosemicarbazone with bromoacetal leaas to the hydrobromide of phosphorylacetaldehyde N-methyl-N-2-(1,3-thiazolyl)hydrazone, the thiazole structure of the heterocycle of this compound is also retained when it is dissolved, due to the impossibility of tautomeric conversions due to the structural features. In all cases, salt formation occurs at the endocyclic nitrogen atom. The conversion of salt-like compounds to free bases does not lead to a change in the thiazole structure of the heterocycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01164874
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  • 7
    Electronic Resource
    Electronic Resource
    Muon addition to nitrogen, oxygen and other atoms: Considerations for level crossing resonance studies (1991)
    Springer
    Hyperfine interactions 65 (1991), S. 987-992 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The purpose of this note is to examine the conditions under which muon level crossing resonance with quadrupolar nuclei may be used to characterise the elusive diamagnetic fraction which is formed when positive muons are stopped in various media and associated chemically with the host molecules. A potential difficulty is identified for nuclei having integral spin, which may explain why cross polarisation to14N has not yet been detected. The general suitability of nuclei with half-integral spin (I≥3/2) is illustrated with the case of17O, and suggestions are made for future studies with other nuclei, including species such as molecular ions and defect complexes (muon-impurity pairs).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397754
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  • 8
    Electronic Resource
    Electronic Resource
    Measurement of17O quadrupole interactions and identification of the diamagnetic fraction in ice by muon level crossing resonance (1991)
    Springer
    Hyperfine interactions 65 (1991), S. 993-1003 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By means of Level Crossing Resonance in a sample of ice which is enriched in H2 17O, the final diamagnetic state of implanted positive muons is determined to be the muonium-substituted molecule HMuO, accommodated in the regular and fully relaxed Ih structure. The17O quadrupole coupling constant is measured to be 6.1 MHz at 200 K assuming an asymmetry parameter close to unity, a decrease of about 5% relative to that in normal ice Ih at 77 K. The isotope effect is attributed to a greater polarization in the vicinity of a muonium (as opposed to a normal hydrogen) bond. At 50 K, an additional resonance is observed which could correspond to a precursor state, so far not definitely identified. One possibility is a muon trapped at a Bjerrum L-defect, giving a {H2O−Mu−OH2}+ species with an,17O quadrupole coupling constant of 8.2 MHz and asymmetry parameter of 0.55. Above this temperature, the fall in the (Gaussian) line-width parameter is attributed to the increasing rate of proton or muon migration, the correlation time dropping from 4 μs at 80 K to 1 μs near the melting-point. The increase in the diamagnetic fraction with rise in temperature is attributed to the increasing proportion of trapping sites available for muon capture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397755
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  • 9
    Electronic Resource
    Electronic Resource
    Level crossing resonance in ice: Identification of two diamagnetic muon states (1994)
    Springer
    Hyperfine interactions 86 (1994), S. 747-752 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Level crossing resonance studies of ice, doped with HF and NH3 to enhance and suppress the concentration of orientational defects, support the hypothesis that muons can trap at such defects to form complexes of the type H2O-Mu+-OH2. The doping alters the partition of the total diamagnetic fraction between this state, which is stable against charge migrationvia proton rearrangement at low temperature, and the neutral HMuO state, the isotopically substituted water molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068974
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