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Non-lorentzian single-molecule line shape: pseudolocal phonons and coherence transfer
1Physical Chemistry Laboratory, Swiss Federal Institute of Technology, ETH-Zentrum, CH-8092 Zurich, Switzerland.
Physical Review Letters
|September 6, 2000
Summary
Investigating terrylene molecules in naphthalene crystals revealed a unique excitation line shape. This deviation from the standard Lorentzian is caused by a pseudolocal phonon, creating a quasiresonant transition and coherence transfer.
Area of Science:
- Molecular Spectroscopy
- Solid-State Physics
- Quantum Optics
Background:
- Single-molecule spectroscopy provides insights into localized excitations.
- The interaction between chromophores and host lattices influences optical properties.
Purpose of the Study:
- To investigate the excitation line shape of a single terrylene molecule in a naphthalene crystal.
- To understand the origins of deviations from the conventional Lorentzian line shape.
Main Methods:
- High-resolution single-molecule spectroscopy.
- Analysis of optical transition line shapes.
- Theoretical modeling of chromophore-phonon interactions.
Main Results:
- Observed excitation line shape deviates from a pure Lorentzian.
- Identified a dispersive component and a sideband in the line shape.
- Attributed the deviation to a pseudolocal phonon induced by molecular substitution.
Conclusions:
- A pseudolocal phonon leads to a quasiresonant transition in the terrylene molecule.
- Coherence transfer between optical transitions causes the non-Lorentzian line shape.
- This study elucidates the complex optical dynamics in molecular crystals.