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  • 67.40Yv  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Optical studies of atoms and ions in superfluid helium using a ccd-camera system (1995)
    Springer
    The European physical journal 98 (1995), S. 399-404 
    Details
    ISSN: 1434-6036
    Keywords: 32.70Jz ; 67.40Yv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spectroscopic study ions and atoms immersed into liquid helium can contribute to the understanding of the structure of pointlike defects in helium and their interaction with the superfluid phase as well. Ions and atoms serve as microprobes in the form of so calledbubble orsnowball type defects in the quantum fluid. The optical emission of these structures is recorded. From the optical spectra of previous experiments the influence of the surrounding helium on the electronic configuration of the impurity atoms or ions was examined. In this experiment the light emitted from the defect atoms is observed by a camera. The pictures obtained yield information about the distribution and the motion of the defect particles in the superfluid. As an example the fluorescence light resulting from the recombination of magnesium, barium and thallium ions with excess electrons in superfluid helium was recorded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338414
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Atoms and ions in superfluid helium (1995)
    Springer
    The European physical journal 97 (1995), S. 425-432 
    Details
    ISSN: 1434-6036
    Keywords: 32.70Jz ; 67.40Yv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Optical spectra of atomic impurities in liquid helium have been investigated. Comparison is made between the wavelength of the free atomic and ionic lines and those in the liquid helium matrix. Simultaneously, the line width and a possible asymmetry is recorded. Presence and absence of radiative transitions depend on the species of the atom implanted in the quantum fluid. The absence of any optical transitions from states lying as low as 1,8 eV below the ionization limit will be explained in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317225
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    Paper (German National Licenses)
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