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Vibration‐induced energy relaxation in two‐level system
Author(s) -
Menšík Miroslav,
Nešpůrek Stanislav
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200450871
Subject(s) - physics , vibrational energy relaxation , vibration , diagonal , relaxation (psychology) , molecular vibration , atomic physics , displacement (psychology) , electron , coupling (piping) , basis (linear algebra) , quadratic equation , amplitude , harmonic , quantum mechanics , materials science , raman spectroscopy , mathematics , excited state , psychology , social psychology , geometry , metallurgy , psychotherapist
Energy decay in a general two‐level electronic system coupled to a vibrational harmonic mode interacting with a thermal bath is studied theoretically. The model assumes a general form of the off‐diagonal elements (in the electronic basis) of the vibrational‐electronic interaction. The cases for constant, linear, and quadratic dependence with respect to the vibrational displacement are investigated. For short‐time regime, fast oscillations corresponding to a coherent energy exchange between electrons and vibrations appear. Their frequency Ω corresponds to the energy difference ( ħ Ω) between electronic levels. Additionally, for the case of linear or quadratic coupling, the amplitude modulation of the oscillations with the frequency ω equal to that of vibrational motion is found.