Anharmonic quantum contribution to vibrational dephasing
Debashis Barik, Deb Shankar Ray
Abstract
Based on a quantum Langevin equation and its corresponding Hamiltonian within a c-number formalism we calculate the vibrational dephasing rate of a cubic oscillator. It is shown that leading order quantum correction due to anharmonicity of the potential makes a significant contribution to the rate and the frequency shift. We compare our theoretical estimates with those obtained from experiments for small diatomics N2, O2 and CO.
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