ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (5)
  • Positronium  (5)
  • Springer  (5)
  • International Union of Crystallography (IUCr)
  • 2020-2020
  • 1970-1974  (5)
  • 1955-1959
  • 1945-1949
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (5)
  • Media Resources and Communication Sciences, Journalism
Collection
  • Articles  (5)
Source
Keywords
Publisher
  • Springer  (5)
  • International Union of Crystallography (IUCr)
Years
  • 2020-2020
  • 1970-1974  (5)
  • 1955-1959
  • 1945-1949
Year
Topic
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (5)
  • Media Resources and Communication Sciences, Journalism
  • Physics  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Positronium in molecular substances (1974)
    Springer
    Applied physics 3 (1974), S. 1-7 
    Details
    ISSN: 1432-0630
    Keywords: Positronium ; Molecular substances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The progress of research into the behavior of the positronium in molecular substances in the last several years is reviewed. The Ps atom can be treated as a solute in a liquid. The repulsive exchange force is the dominant force which reacts against the van der Waals attractive force. One of the most useful general relationships found is the one between the pick-off quenching rate and the surface tension of the liquid. The pick-off quenching rate is found, in general, to be an additive property of the functional groups of a molecule. The quenching of theo-Ps atom by an active quenching agent in an inert solvent has been found to be primarily diffusion controlled. Some deviations from the simple Arrhenius equation have been found. For gases, more theoretical work on the collision problems of Ps with atoms or molecules is needed. For amorphous molecular solids, it is likely that the property of pick-off quenching ofo-Ps is similar to that in liquids. However, in crystalline molecular solids, the situation is quite different. A few definite cases have been found where a Ps atom does not form or exist. Further work in this area should be very interesting. The foregoing leads us to believe that positronium or positron annihilation can be useful in the study of fundamental properties of molecular liquids and solids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00892327
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Positronium quenching reactions and diffusion in solutions (1974)
    Springer
    Applied physics 3 (1974), S. 31-35 
    Details
    ISSN: 1432-0630
    Keywords: Positronium ; Diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The temperature effect on positronium quenching rates for p-benzoquinone and iodine in several solvents was determined. The quenching rate constantk 1 follows ak 1∝1/η relationship better than thek 1∝T/η one, predicted by ordinary theory. A simple theoretical treatment based on diffusion theory shows that the temperatureT of the solute, positronium, may not be the same as the temperature of the solvent if the positronium is not fully thermalized. This temperature is found to be about twice the room temperature for the solvents investigated. The findings further support the theory that positronium reactions are “diffusion controlled” in liquid solutions. The activation energies of all the positronium reactions studied are either negligible or less than 0.1 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00892331
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Temperature dependence of the narrow component for positronium in Ice (1974)
    Springer
    Applied physics 5 (1974), S. 49-52 
    Details
    ISSN: 1432-0630
    Keywords: Positronium ; Ice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The detailed shape of the Ps momentum distribution in ice, as given by the 2-photon angular correlation, has been obtained for several temperatures between −40 and 0°C. The narrow component was analyzed in terms of 2 parts, one caused by delocalized and the other by localized Ps. The latter one is interpreted in terms of Ps trapped by thermally excited defects with a formation energy of about 0.4 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01193394
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Positronium formation in ice (1974)
    Springer
    Applied physics 5 (1974), S. 179-180 
    Details
    ISSN: 1432-0630
    Keywords: Positronium ; Molecular substances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Applying a new method, based on integral measurements, we demonstrate that there is a broadening of the narrow component in the gamma angular distribution curve when positrons annihilate in ice. This broadening seems to be imputable to the existence of Bloch states and justifies the discordance between theoretical and experimental values of the magnetic quenching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00928233
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    An improved wave function for positronium hydride: Preliminary report (1974)
    Springer
    Applied physics 3 (1974), S. 159-160 
    Details
    ISSN: 1432-0630
    Keywords: Positronium ; Positronium hydride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An improved wave function for positronium hydride is reported. The new wave function, which is of the same form as previously reported [Lebeda, C. F., Schrader, D. M.: Phys. Rev.178, 24 (1969)] yields a total energy of −0.7792 a.u., the lowest and hence most accurate value yet reported. This total energy indicates that positronium hydride is more stable than separated positronium and hydrogen atoms by 0.794 eV. The calculated annihilation rate, 2.22 nsec−1, is compared with available experimental evidence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00884415
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...