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  • American Institute of Physics (AIP)  (2)
  • Nature Publishing Group  (2)
  • Institute of Physics  (1)
  • Geological Society of America (GSA)
  • Periodicals Archive Online (PAO)
  • 2000-2004
  • 1995-1999  (2)
  • 1970-1974
  • 1960-1964
  • 1950-1954  (4)
  • 1997  (2)
  • 1954  (4)
Collection
Publisher
Years
  • 2000-2004
  • 1995-1999  (2)
  • 1970-1974
  • 1960-1964
  • 1950-1954  (4)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Fragment rotational distributions from the dissociation of NeBr2: Experimental and classical trajectory studies (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 5454-5467 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Br2 fragment rotational distributions that result from the vibrational predissociation of NeBr2 in the B electronic state have been measured for several initial vibrational levels. In each case, the rotational distributions extend to the effective energetic limit determined by the amount of energy available (Eavl) for disposal into the fragment rotational and translational degrees of freedom. Analysis of the data allows refinement of the NeBr2 dissociation energy; we find that D0=70.0±1.1 cm−1 for the X electronic state, v=0. Both Δv=−1 and −2 dissociation events have been examined. For dissociation pathways with approximately the same value of Eavl the Δv=−2 pathways are observed to have a higher fraction of the fragment energy in rotational excitation. The overall shape of the Δv=−1 distributions are insensitive to the value of Eavl, suggesting that a Franck–Condon model for the dissociation may have some validity, though quantitative quantum mechanical calculations demonstrate that this model does not reproduce the large degree of fragment rotational excitation. Two classical models for the dissociation also fail to reproduce the extent of fragment rotational distribution. This result is discussed in light of previous experimental and theoretical investigations, focusing on the apparent agreement of classical models with the IBr fragment rotational distributions that result from the dissociation of NeIBr. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473570
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Morphology of porous media studied by nuclear magnetic resonance (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 7802-7809 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The filling processes of water and cyclohexane in porous silica (40 Å, 60 Å and 112 Å pore size samples) were studied using T2 nuclear magnetic resonance (n.m.r.) experiments. The silica pores contained water or cyclohexane and the experiments were performed at room temperature and at filling fractions ranging from 0.02 to 1.0 (that is, completely full). Two distinct processes were observed which depended on the hydrophilicity of the silica surface (or the surface adhesion of the liquid). Water was found to collect in small puddles in the silica interstices, and to form a surface layer over the silica before the remaining pore volume was filled. Water in a surface-treated porous silica and cyclohexane in regular porous silica appeared to completely fill the smaller before the larger pores, and not form a separate surface-coating layer. This work also presents the techniques used to calculate quantitative information about the filling process; specifically, determination of the volume to surface-area ratio of the liquid puddles as well as the number of these puddles, is demonstrated. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473780
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  • 3
    Electronic Resource
    Electronic Resource
    Presence and Absence of the Pre-Natal Check in Lambs' Birthcoats (1954)
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 878-879 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sickle-fibres constitute the most easily perceived evidence of the pre-natal check3-5. Of ten N/ + Aggrade lambs studied in a number of body regions, all had sickle-fibres on the shoulder patch and shoulder, and they were present on several necks, withers, sides and o backs, but not on any ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/173878b0
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  • 4
    Electronic Resource
    Electronic Resource
    Caution in the Use of Liquid Propane for freezing Biological Specimens (1954)
    [s.l.] : Nature Publishing Group
    Nature 174 (1954), S. 235-235 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] On one occasion when I was slowly condensing propane in a flask chilled with liquid nitrogen, I obtained what appeared to be such a mixture : that is, I obtained two distinct layers of liquid in the flask, one of which had the characteristic appearance of liquid oxygen. This experience suggested ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/174235b0
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  • 5
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    The Wrexham Experiment (1954)
    Liverpool : Periodicals Archive Online (PAO)
    The Town planning review. 24:4 (1954:Jan.) 271 
    Details
    ISSN: 0041-0020
    Topics: Architecture, Civil Engineering, Surveying , Sociology
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5341-1954-024-04-000003
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  • 6
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    Photoelectric observations of occultations (1954)
    Institute of Physics
    Details
    Publication Date: 1954-12-01
    Print ISSN: 0004-6256
    Electronic ISSN: 1538-3881
    Topics: Physics
    Published by Institute of Physics
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