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  • 1
    Electronic Resource
    Electronic Resource
    Single-crystal YBa2Cu3O7−x and Bi2Ca1+xSr2−xCu2O8+y surfaces and Ag adatom-induced modification (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3130-3135 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Comparison of x-ray photoemission results for single crystal and polycrystalline YBa2Cu3O7−x allows us to identify oxygen vacancies in the Cu-O chains and determine their effects on the Cu, Ba, and Y core level line shapes. The deposition of adatoms of Ag onto single crystals of YBa2Cu3O7−x and Bi2Ca1+xSr2−xCu2O8+y leads to changes in the Cu 2p3/2 emission indicative of slight Cu2+ to Cu1+ surface reduction, with greater modification for the 1-2-3's than the 2-1-2-2's. O 1s core level results show Ag-induced broadening because of these surface effects. The Ba 3d and Y 3d structures showed minimal changes for the 1-2-3 surface. Ag deposition onto the 2-1-2-2 samples also leads to Bi dissociation and subsequent surface segregation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342709
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  • 2
    Electronic Resource
    Electronic Resource
    A new red shift mechanism with possible applications to astrophysical problems such as quasars (1975)
    Springer
    International journal of theoretical physics 13 (1975), S. 417-418 
    Details
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new red shift mechanism is proposed based on a succession of hyperfine atomic Raman interactions of a photon with hydrogen atoms. The possibility that this atomic Raman effect may be the cause of any given astronomically observed red shift can be observationally tested as follows. The hydrogen 21 cm line from the same source willnot be shifted by this hyperfine interaction (since it is a resonance process), while visible and ultraviolet lines are shifted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01808323
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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