| Autor: |
Mikhailin, A., Slutsker, I. |
| Zdroj: |
Soviet Physics Journal; 1991, Vol. 34 Issue 5, p421-425, 5p |
| Abstrakt: |
A mechanism for the generation of strong energy fluctuations in a chain of harmonically and anharmonically coupled atoms in a state of thermodynamic equilibrium has been investigated by a molecular dynamics method. Energy fluctuations multiply exceeding the mean value were localized in a group of three to five atoms with lifetime on the order of an atomic vibrational period. They arise as a consequence of collisions of density waves propagating along the chain. A collision of waves of the same density sign leads to a fluctuation of the potential energy, while for differing signs a fluctuation in the kinetic energy occurs. In particular, collision of dilitatin waves leads to thermal breaking of the chain. The energy concentration at the moment of collision is 30% greater in a harmonic chain than in an anharmonic one. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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