THE PHONON DENSITY OF STATES AND THE NEUTRON SCATTERING FACTOR FOR A DISORDERED POLYMER CHAIN |
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| Authors: | CRU Xiao-lin YAO Kai-lun |
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| Institution: | 1. Huazhong University of Science and Technology, Wuhan, China;
2. University of Minnesota, U. S. A |
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| Abstract: | In this paper we calculated the phonon density of states and the neutron scattering factor in a model of a random polymer chain embedded as a self-avoiding walk on a diamond lattice by using the equation of motion method of Green's function. The Iiadltonian of the mdel includes stretching force, bending force and dihedral force. The result showea that the gap near ω=0 disappeared,which is in good agreement with experiment. It is also found that peaks of the spectrunr at low frequencies are sensitive to the degree of crystallization. This indicates that they are related only to the vibration of the crystalline region. |
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