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The phonon wings in the (S1 <-- S0) spectra of tetracene, pentacene, porphin and phthalocyanine in liquid helium droplets

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Toennies,  J. P.
Emeritus Group Molecular Interactions, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Hartmann, M., Lindinger, A., Toennies, J. P., & Vilesov, A. F. (2002). The phonon wings in the (S1 <-- S0) spectra of tetracene, pentacene, porphin and phthalocyanine in liquid helium droplets. Physical Chemistry Chemical Physics, 4(20), 4839-4844.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-17B8-A
Abstract
The vibronic spectra of the large organic molecules tetracene (C18H12), pentacene (C24H14), base-free porphin (C20H14N4) and base-free phthalocyanine (C32H18N8) have been investigated in large (N = 103-104) 4He droplets using laser induced fluorescence. The spectra show sharp zero phonon lines (Δν ≤ 0.2 cm-1), accompanied by weaker phonon wings on the blue side. The very small inhomogeneous broadening of the zero phonon lines supports the unique properties of liquid He as an extremely gentle ultra-cold matrix for high resolution spectroscopy of larger molecules. Pronounced structures in the phonon wings, which are characteristic for each molecule, are attributed to the excitation of vibrational modes of the helium atoms located in shells surrounding the molecule.