Browsing by Author "Lu, Fan"

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    Collisional ionization in RB (NS,ND) -SF [backward], collisions
    (1985) Lu, Fan; Dunning, F. Barry; Walters, G. King; Jeys, Thomas H.
    Tbe thereotical work of Matsnzawa based on the essentially free electron model suggests that the rate constant for collisional ionization of a high rydberg atom is essentially the same as that for attachment of free electron haying the same momentum distribution. In the present work we test the essentially free electron model by comparing rate constants measured for the following reaction with those expected on the basis of free electron studies. The data are in good agreement indicating that studies of Rydberg atom collisions can provide information on very-low-energy electron interaction.
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    Use of neutron resonant scatterers as phasors to study molecular dynamics
    (1989) Lu, Fan; Trammell, George T.
    Neutron resonant scattering in the epithermal regime provides a potential tool for studying molecular dynamics. The theory is established by expressing the scattering function in terms of the Fourier and Laplace transforms of correlation functions which relate to the different positions of two coherent scatterers at different times. The correlation between resonant and non-resonant scatterers is especially useful in solving the scattering "phase" problem and obtaining further dynamic information. The theory is applied to the dynamic study of polyhedron and macro molecules in the linear regime (harmonic).