Hannover 2010 – scientific programme

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MO: Fachverband Molekülphysik

MO 4: Spectroscopy in He droplets

MO 4.2: Talk

Monday, March 8, 2010, 17:00–17:15, F 142

Spectroscopy of PTCDA oligomers in helium nanodroplets — •Jan Roden and Alexander Eisfeld — MPIPKS, Dresden, Germany

During the past few decades there has been intensive experimental and theoretical research into energy transfer [1] and optical properties [2] of molecular aggregates (molecules interact via dipole-dipole interaction), where coupling to vibrations often plays an important role. This research addresses e.g. the prominent light absorption of J- and H-aggregates or the transfer of electronic excitation energy in photosynthetic units and organic solar cells.

The helium nanodroplet isolation (HENDI) spectroscopy enables measuring fully vibrational resolved spectra of single molecules and aggregates with varying number N of molecules at temperatures below 1 K [3].

Including vibrational modes of the molecules, we calculate N-dependent oligomer spectra of 3,4,9,10-perylene-tetracarboxylic dianhydride (PTCDA). Comparison of the calculated spectra with experimental results shows good agreement.

[1] J. Roden, G. Schulz, A. Eisfeld, J. Briggs, J. Chem. Phys. 131(2009) 044909

[2] J. Roden, A. Eisfeld, W. Wolff, W. Strunz, PRL 103 (2009) 058301

[3] M. Wewer, F. Stienkemeier, Phys. Rev. B 67 (2003) 125201