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  • 1995-1999  (3)
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Material
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Year
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  • 1
    Electronic Resource
    Electronic Resource
    High nuclear polarization in 3He and 3He–4He gas mixtures by optical pumping with a laser diode (1996)
    Springer
    Applied physics 63 (1996), S. 629-633 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 32.80B; 67.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract.  New diode lasers delivering 50 mW output power at 1083 nm are shown to be efficient sources for optical pumping of helium. They can polarize nuclei in a 3He gas up to M=50% over the pressure range 0.4–1.6 torr. Larger nuclear polarizations M of 3He nuclei, of order 80%, can be obtained in 3He–4He mixtures when the laser frequency is tuned to a 4He line. A standard optical measurement of nuclear polarization M has been extended to the case of 3He–4He mixtures. The effect of various parameters on the steady-state polarization M and on the pumping time T p is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01831004
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    High nuclear polarization in3He and3He-4He gas mixtures by optical pumping with a laser diode (1996)
    Springer
    Applied physics 63 (1996), S. 629-633 
    Details
    ISSN: 1432-0649
    Keywords: 32.8013 ; 67.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New diode lasers delivering 50 mW output power at 1083 nm are shown to be efficient sources for optical pumping of helium. They can polarize nuclei in a3He gas up toM = 50% over the pressure range 0.4–1.6 torr. Larger nuclear polarizationsM of3He nuclei, of order 80%, can be obtained in3He-4He mixtures when the laser frequency is tuned to a4He line. A standard optical measurement of nuclear polarizationM has been extended to the case of3He-4He mixtures. The effect of various parameters on the steady-state polarizationM and on the pumping timeT p is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01831004
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Wetting properties of liquid helium on rubidium metal (1995)
    Springer
    Journal of low temperature physics 98 (1995), S. 91-113 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Wetting properties of liquid helium on rubidium metal have been investigated in the temperature range 1.0–1.7 K using a heat conduction method. The rubidium surface is found to be wetted under saturated vapor conditions. Prewetting transitions have been observed for rather weak offsets from saturation, indicating that rubidium is close to the nonwetting limit at T = 0 K. Presumably because of substrate inhomogeneities, the prewetting transitions are experimentally found to be continuous and hysteretic. No evidence for the prewetting critical point has been found up to 1.7 K. The prewetting line verifies a simple linear relation between the liquid-vapour surface tension and the two third power of the chemical potential offset, but does not conform quantitatively to the simple model currently used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00754070
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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