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  • 1
    ISSN: 1432-0630
    Keywords: 35 ; 42.55 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A saturated absorption technique, using an actively stabilized cw dye laser has been developed to measure the saturation intensities of hyperfine transitions in a gaseous medium. Hyperfine lines belonging to theB-X system of molecular iodine have been investigated. The experimental method proposed, provides a means for measurement of the absolute value of the saturation parameter of the transition with an accuracy better than 10%. The behavior of the saturation intensity of some transitions with iodine pressure has been investigated in the range 30 m Torr→90mTorr.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 100 (1998), S. 314-323 
    ISSN: 1432-2234
    Keywords: Key words: Infinite periodic spin lattices ; Spin function ; Spin blocks ; Heisenberg Hamiltonian ; Valence bond
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract. An approximate spin function for infinite periodic spin lattices is introduced. The “encapsulated spin function” is built from spin blocks variationally determined on open clusters. It gives a zeroth-order description of the short-range spin correlation while insuring a proper translational symmetry with an appropriate projection of the local spin function over the entire lattice. A recursion expression is derived that removes the normalization difficulty that arises in the projection. The one-dimensional Heisenberg regular Hamiltonian is tested in the present paper but the model allows for more complicated topologies of the interactions, including long-range exchange and three-spin exchange.
    Type of Medium: Electronic Resource
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