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  • 32.20.J  (2)
  • Brain tumour  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    The stark effect in the 6snf Rydberg series of barium (1985)
    Springer
    The European physical journal 322 (1985), S. 211-219 
    Details
    ISSN: 1434-601X
    Keywords: 32.20.J ; 32.60.S
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The polarizabilities of the barium 6snf 3 F 2 levels with principal quantum numbern ranging from 11 to 40 have been measured in a high resolution laser-atomic-beam experiment. In Coulomb approximation the contributions to the polarizabilities of all known even-parity levels connected with the3 F 2 levels via the electric dipole operator have been calculated. In this way information on the to a large extent unknown 6sng 3 G 3 Rydberg series is extracted. The results support earlier observations of a perturbation of this series in betweenn = 18 and 19, but no evidence has been found for a perturbation nearn = 14.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411885
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The spectral dependence of the optical properties of human brain (1989)
    Springer
    Lasers in medical science 4 (1989), S. 221-227 
    Details
    ISSN: 1435-604X
    Keywords: Optical properties ; Photodynamic therapy ; Glioma ; Brain tumour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics , Technology
    Notes: Abstract The in vitro optical properties of slices of human brain tissue were measured. The experiments were performed with an integrating sphere and covered the wavelength range from 400 to 1100 nm. Both normal brain tissue (white and grey matter) and tumour tissue (a malignant glioma and a melanotic melanoma) were investigated. From the experimental data the Kubelka-Munk absorption and scattering coefficients were determined. From these data we calculated the transport absorption and scattering coefficients by using the diffusion approximation. Blood and water appeared to be the dominant chromophores. In the wavelength range mentioned, the absorption coefficients varied over more than two orders of magnitude. The scattering coefficients increased slowly towards the shorter wavelengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02032451
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Avoided level crossings in bound Rydberg states of barium in an electric field (1989)
    Springer
    The European physical journal 13 (1989), S. 107-113 
    Details
    ISSN: 1434-6079
    Keywords: 32.60.S ; 32.70 ; 32.20.J ; 32.80.B
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In a CW laser experiment on bound Rydberg states of barium electric-field-induced level crossings were studied. A regular type of avoided crossing of 6snf 3 F 2 and 6s (n+4)s 3 S 1 levels (n≈60,M=0) was observed under circumstances where the minimum separation was larger than the linewidth involved. This type of crossing could be reproduced using a diagonalisation procedure of the total energy matrix in the presence of the field. However, in the case of avoided crossings of the 6snf 3 F 2 and 6s(n+4)p 1 P 1 sublevels, where the minimum separation was smaller than the linewidth of the3 F 2 level, an interference-like profile was recorded. An important feature in the explanation of this interference-like profile turned out to be the broadening of the3 F 2 level by small field inhomogeneities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01398579
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    Paper (German National Licenses)
    Fulltext
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