Localized vibration states in molecular lattices
Localized vibration states in molecular lattices
In molecular lattices besides small translational motions of the molecules small librational motions are possible. In general there is a coupling between the two types of motion. If there are defects in the lattice, localized vibrational states can occur, both for translational and librational modes...
| Personal Name(s): | Dettmann, K. |
|---|---|
| Ludwig, W. | |
| Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
| Imprint: |
Jülich
Kernforschungsanlage Jülich, Verlag
1965
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| Physical Description: |
p. 689-707 |
| Document Type: |
Report Book |
| Research Program: |
ohne Topic |
| Series Title: |
Berichte der Kernforschungsanlage Jülich
307 |
| Link: |
OpenAccess OpenAccess |
| Publikationsportal JuSER |
|
In molecular lattices besides small translational motions of the molecules small librational motions are possible. In general there is a coupling between the two types of motion. If there are defects in the lattice, localized vibrational states can occur, both for translational and librational modes. These modes are investigated using the simple model of a linear lattice of dumpbell-molecules. From a general discussion of the Green's function it follows that the frequencies of the localized librational states can occur in the region of the spectrum which in the ideal lattice is dominated by the translational modes and vice versa. Also both kinds of Iocalized state can have frequencies in regions where there are no ideal Iattice frequencies. Further, it is possible to have more localized Iibrational than translational states. |