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Effect of anharmonicity on energy relaxation of a dissipative quantum oscillator

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Abstract

The effect of anharmonicity on the energy relaxation of excited state has been studied by means of a dissipative oscillator. The present study also sheds light on the recent femtosecond stimulated Raman spectroscopy results of Kovalenko et al. (J. Chem. Phys. 139 011101 2013) on optical cooling of trans-stilbene. It has been shown that anharmonicity plays a crucial role in explaining the time-dependent frequency shift as well as the time evolution of bandwidth of \(\nu _{C=C}\) mode of trans-stilbene in excited state, found in experiment.

Graphical abstract

The effect of anharmonicity on the energy relaxation of a vibrationally excited state is presented in this paper. The paper also suggest that at initial stage IVR plays a key role in changing the effective temperature of optically excited molecule.

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Acknowledgements

RK acknowledges DST, Govt. of India for financial assistance. PK acknowledges DST, Govt. of India for the financial support through sanctioned project [No. ECR/2016/000279 ]. We also thank Prof N. Ernsting for sending us experimental data of Figure 5.

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  1. Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India

    Ramesh Kumar & Pradeep Kumar

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  1. Ramesh Kumar
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  2. Pradeep Kumar
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Correspondence to Pradeep Kumar.

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Kumar, R., Kumar, P. Effect of anharmonicity on energy relaxation of a dissipative quantum oscillator. J Chem Sci 131, 23 (2019). https://doi.org/10.1007/s12039-019-1599-4

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  • DOI: https://doi.org/10.1007/s12039-019-1599-4

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