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  Anomalous fine structures of the 000 band of tetracene in large He droplets and their dependence on droplet size

Portner, N., Toennies, J. P., Vilesov, A. F., & Stienkemeier, F. (2012). Anomalous fine structures of the 000 band of tetracene in large He droplets and their dependence on droplet size. Molecular Physics, 110(15-16): 679633, pp. 1767-1780. doi:10.1080/00268976.2012.679633.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-10E1-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-10E2-D
Genre: Journal Article

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 Creators:
Portner, Nikolas, Author
Toennies, Jan Peter1, Author              
Vilesov, Andrey F., Author
Stienkemeier, Frank, Author
Affiliations:
1Emeritus Group Molecular Interactions, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063297              

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Free keywords: spectroscopy; tetracene; He dropletsPhysics, Atomic, Molecular & Chemical
 Abstract: The spectrum of the 000 band of the S1 <-- S0 transition of tetracene molecules embedded in superfluid helium droplets is studied via laser induced fluorescence spectroscopy. Measurements are reported for droplets of different average sizes from about 103 to 107 helium atoms. In agreement with previous observations in small droplets the 000 band shows two components designated as alpha and beta peaks split by about 1 cm-1. In addition the higher energy beta-peak shows some sharp superimposed peaks separated by about 0.05 cm -1. A very similar fine structure of the 000 band is found in the tetracene-argon complex and in pentacene which challenges a simple explanation in terms of a free molecule Hamiltonian. Presumably the rotational-translational coupling of very anisotropic molecules, such as tetracene in superfluid helium has a noticeable affect on the spectra. In droplets larger than about Ñ= 106, obtained in supercritical expansions, the beta peak has a broad feature shifted by 0.1 cm -1 towards higher energies from the maximum found at smaller sizes which dominates the spectrum at Ñ = 107. Several mechanisms including the interaction with the phonons in the interior of the droplets and trapping by quantum vortices are discussed as possible explanations for the unexpected spectral behaviour in the large droplets.

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Language(s): eng - English
 Dates: 2012-05-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 633808
DOI: 10.1080/00268976.2012.679633
 Degree: -

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Title: Molecular Physics
  Alternative Title : Mol. Phys.
Source Genre: Journal
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Pages: - Volume / Issue: 110 (15-16) Sequence Number: 679633 Start / End Page: 1767 - 1780 Identifier: -