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  • 1
    Electronic Resource
    Electronic Resource
    VAPOR PHASE BROMINATION OF ALKYL HALIDES (1955)
    s.l. : American Chemical Society
    The @journal of organic chemistry 20 (1955), S. 1430-1442 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01127a023
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  • 2
    Electronic Resource
    Electronic Resource
    Choice of scans in X-ray diffraction (1972)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 28 (1972), S. 143-151 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In a recent paper (Werner, S. A. Acta Cryst. (1971). A27, 665) it was pointed out that the choice of scans in a neutron diffraction experiment should be based on the criterion that the diffracted beam enters the detector on its centerline for each angular setting of the crystal. The same criterion should be applied in X-ray diffraction. Since the spectral distribution of a source of X-rays and neutrons is quite different, conclusions regarding the optimum coupling between the detector and crystal motions are different in these two cases. In this paper, formulas are derived (within the framework of certain gaussian approximations) for the optimum scanning ratio g in equatorial plane X-ray diffraction experiments on single crystals. For the case when a monochromator is not used, g is independent of scattering angle 2θB for a large range of instrumental parameters and Bragg angles θB. It is found that a θ–2θ scan is essentially never advisable. An expression for g is derived for the case when a planar monochromator is used in symmetric Bragg reflection. The optimum scan is found to depend on the scattering angle, but not in such a marked way as in the neutron case. Coupling the detector and crystal motions in the manner suggested allows one to decrease the acceptance aperture to its minimum width, thus keeping the background due to thermal diffuse scattering (TDS) and incoherent scattering as low as possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739472000300
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  • 3
    Electronic Resource
    Electronic Resource
    Choice of scans in neutron diffraction (1971)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 27 (1971), S. 665-669 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Neutron-diffraction experiments on single-crystal samples are generally carried out using either an ω-scan (crystal rotating, detector fixed) or a θ–2θ scan (detector coupled 2:1 to the crystal). In order for the center of the diffracted beam to enter the detector on its centerline at all angular settings of the crystal during the scan of a Bragg reflection, neither of these conventional scanning techniques is optimum. A formula is derived which gives the optimum coupling between the detector and the crystal motions, and it is suggested this mode of scanning should be implemented in performing neutron-diffraction experiments on single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739471001414
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  • 4
    Electronic Resource
    Electronic Resource
    Optimum scanning ratio in neutron diffraction (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 577-578 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The formula for the optimum scanning ratio, g [Werner, S. A. (1972). Acta Cryst. A27, 665-669] in equatorial-plane, neutron-diffraction experiments has been experimentally verified. This ratio gives the correct coupling between the detector and crystal motions such that the diffracted beam always enters the detector on its centerline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473001415
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  • 5
    Electronic Resource
    Electronic Resource
    The dependence of the intensities of diffuse peaks on scattering angle in neutron diffraction (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 372-382 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The variation of the intensity of diffuse peaks with scattering angle, 2θs, in neutron diffraction is investigated analytically. It is found that the intensity of a diffuse peak relative to a Bragg peak for a polycrystalline sample is much larger than for a single crystal. However, the diffuse intensity drops off much more rapidly with 2θs in the polycrystalline case than in the single-crystal case. If the resolution of the instrument is 'sharp' in comparison with the extent of the diffuse scattering in reciprocal space, it is found that there is almost no variation of the intensity from one Brillouin zone to the next in a single-crystal experiment. These results are applied to the interpretation of an experiment on a Cu-Mn alloy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473000975
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  • 6
    Electronic Resource
    Electronic Resource
    Streaks of instrumental origin near a Bragg point (1988)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 44 (1988), S. 383-392 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: It is predicted that, at some sufficiently high level of sensitivity, two streaks intersecting at the Bragg point and symmetrically situated about the reciprocal-lattice vector G should always be observable in a diffraction experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767388001096
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  • 7
    Electronic Resource
    Electronic Resource
    On Zachariasen's 1967 paper on the general theory of X-ray diffraction in crystals (1969)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 25 (1969), S. 639-639 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: It is believed that there is an error in the paper by W. H. Zachariasen [Acta Cryst. (1967) 23, 558] and attention is drawn to relevant work published elsewhere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739469001434
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  • 8
    Electronic Resource
    Electronic Resource
    The Optical Spectrum of Hafnium (1923)
    [s.l.] : Nature Publishing Group
    Nature 111 (1923), S. 322-322 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DURING the progress of the work of Coster and Hevesy on the concentration and isolation of the new element hafnium (atomic number 72), the discovery of which was announced in NATURE of January 20, p. 79, we have examined spectroscopically a large number of their preparations in order to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/111322a0
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  • 9
    Electronic Resource
    Electronic Resource
    The Optical Spectrum of Hafnium (1923)
    [s.l.] : Nature Publishing Group
    Nature 112 (1923), S. 618-619 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN our letter to NATURE of March 10, 1923, we gave a preliminary list of the most prominent lines between 2500 and 3500 Å. U. in the arc spectrum of the new element hafnium, discovered by Coster and Hevesy (see NATURE, January 20, February 24, April 7, 1923). In this list we included only lines ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/112618b0
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  • 10
    Electronic Resource
    Electronic Resource
    On Urbain's Celtium Lines (1923)
    [s.l.] : Nature Publishing Group
    Nature 111 (1923), S. 461-461 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN a previous letter (NATURE, March 10, p. 322) we have shown that the optical spectrum of the new element hafnium, of atomic number 72, which was discovered a short time ago by Coster and Hevesy, does not contain any of the lines belonging to the characteristic spectrum ascribed by Urbain ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/111461a0
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