For a thermal distribution of noninteracting anharmonic oscillators, the quantum echo response function differs from the classical mechanical limit in exhibiting recurrences and in the existence of a quantum mechanical frequency shift. Both of these effects are reproduced by the semiclassical approach. In a large system with dissipation, effectively irreversible dephasing processes can obscure the differences between classical and quantum calculations.
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy
- Physical and Theoretical Chemistry