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  • Electronic Resource  (4)
  • 1995-1999  (4)
  • 1996  (4)
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  • Electronic Resource  (4)
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  • 1995-1999  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Far-wing excitation study of the reactions in the Hg–H2 collisional quasimolecules. II. Rovibrational distributions of HgH, HgD (X 2Σ+) formed from Hg–H2, D2, HD (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 7474-7479 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have applied the laser-pump/probe and double-beam absorption/dispersion approaches to the far wings of the Hg 3P1–1S0 resonance line broadened by collisions with H2, D2, and HD. Absolute reduced absorption coefficients of the Hg–D2 quasimolecules have been determined as a function of the wave-number shift Δ from the resonance-line center both in the red and blue wings. The nascent rotational distributions have been determined for the v=0 and 1 levels of HgH (X 2Σ+) and the v=0 level of HgD (X 2Σ+) formed from the Hg*(3P1)–H2, D2, and HD collisional–quasimolecular states A˜ and B˜ attained by the red- and blue-wing excitation, respectively. Both of the intermediate states A˜ and B˜ give quite similar rotational distributions peaking around N(approximately-equal-to)18 for HgH and N(approximately-equal-to)25 for HgD insensitive to the excitation-wave-number shift Δ. However, a small difference is found: the red-wing excitation gives larger populations in the low-N levels than the blue-wing one. The departing atom isotope effect is observed in these low-N populations of HgD from Hg–D2 and Hg–HD. The absolute ratio of the nascent yields of v=1 to 0 has been measured to be 0.3, being nearly constant against Δ in both the red and blue wings. These observations indicate that HgH is formed predominantly from a bent H–Hg–H configuration on both the pathways via the A˜ and B˜ states. The different type of transition state, however, may be encountered on the pathways producing the minor components in the low-N levels. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472602
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Far-wing excitation study of the reactions in the Hg–H2 collisional quasimolecules. I. Transit-state selectivity in HgH formation and three-body dissociation (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 7464-7473 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Laser-pump/probe and double-beam absorption/dispersion approaches have been applied to the far wings of the Hg 3P1–1S0 resonance line broadened by collisions with H2. Absolute reduced absorption coefficients of the Hg–H2 quasimolecules have been determined as a function of the wave-number shift Δ from the resonance-line center both in the red and blue wings. Decay probabilities of the excited Hg*(3P1)–H2 quasimolecule into the reactive channel (hGH formation) or into the elastic channel (Hg*(3P1) formation) have been determined as a function of Δ both for the red-wing excited A˜i and blue-wing excited B˜ states. The rest of these decay probabilities have been attributed to three-body dissociation Hg(1S0)+H+H. These results indicate that (a) the A˜-state surface serves more effectively in HgH formation than the B˜-state surface by a factor of about 2.3; but (b) three-body dissociation, in turn, proceeds far more efficiently on the B˜-state surface than on the A˜-state surface. Discussions about the energy barriers and the orbital correlations for HgH formation are presented, based on the Δ dependence of these decaying probabilities. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472609
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Morphological analysis of the cervical spinal canal, dural tube and spinal cord in normal individuals using CT myelography (1996)
    Springer
    Neuroradiology 38 (1996), S. 148-151 
    Details
    ISSN: 1432-1920
    Keywords: Key words Developmental spinal canal stenosis ; Myelopathy ; CT myelography ; Spinal cord
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To verify the conventional concept of “developmental stenosis of the cervical spinal canal”, we performed a morphological analysis of the relations of the cervical spinal canal, dural tube and spinal cord in normal individuals. The sagittal diameter, area and circularity of the three structures, and the dispersion of each parameter, were examined on axial sections of CT myelograms of 36 normal subjects. The spinal canal was narrowest at C4, followed by C5, while the spinal cord was largest at C4/5. The area and circularity of the cervical spinal cord were not significantly correlated with any parameter of the spinal canal nor with the sagittal diameter and area of the dural tube at any level examined, and the spinal cord showed less individual variation than the bony canal. Compression of the spinal cord might be expected whenever the sagittal diameter of the spinal canal is below the lower limit of normal, that is about 12 mm on plain radiographs. Thus, we concluded that the concept of “developmental stenosis of the cervical spinal canal” was reasonable and acceptable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00604802
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Morphological analysis of the cervical spinal canal, dural tube and spinal cord in normal individuals using CT myelography (1996)
    Springer
    Neuroradiology 38 (1996), S. 148-151 
    Details
    ISSN: 1432-1920
    Keywords: Developmental spinal canal stenosis ; Myelopathy ; CT myelography ; Spinal cord
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To verify the conventional concept of “developmental stenosis of the cervical spinal canal”, we performed a morphological analysis of the relations of the cervical spinal canal, dural tube and spinal cord in normal individuals. The sagittal diameter, area and circularity of the three structures, and the dispersion of each parameter, were examined on axial sections of CT myelograms of 36 normal subjects. The spinal canal was narrowest at C4, followed by C5, while the spinal cord was largest at C4/5. The area and circularity of the cervical spinal cord were not significantly correlated with any parameter of the spinal canal nor with the sagittal diameter and area of the dural tube at any level examined, and the spinal cord showed less individual variation than the bony canal. Compression of the spinal cord might be expected whenever the sagittal diameter of the spinal canal is below the lower limit of normal, that is about 12 mm on plain radiographs. Thus, we concluded that the concept of “developmental stenosis of the cervical spinal canal” was reasonable and acceptable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00604802
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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