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Journal Article

Anomalously sharp phonon excitations in He-3 droplets


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

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Poertner, N., Toennies, J. P., & Vilesov, A. F. (2009). Anomalously sharp phonon excitations in He-3 droplets. Europhysics Letters, 88(2), 26007-1-26007-6. doi:10.1209/0295-5075/88/26007.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-12BB-A
The absorption spectra of the S-1 <- S-0 electronic transition of a glyoxal molecule (C2H2O2) embedded inside a pure Fermionic He-3 droplet shows a sharp zero-phonon excitation line followed by a slowly decreasing wing extending to higher frequencies. Superimposed upon the wing, a small but sharp peak is observed at Delta E = 0.99 meV. The wing is shown to be due to the continuum of particle-hole pair excitations while the sharp peak results from the excitation of localized phonons of the snowball shell of He-3 atoms surrounding the chromophore molecule. The exceptional sharpness of the observed phonon peak (at least 10 times narrower than the ordinary bulk phonon peak at the same energy) is attributed to the localization associated with Friedel-like oscillations of the He-3 liquid density. Copyright (c) EPLA, 2009