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Fr 18. 5. 2007, 17.10–17.30 A Kurzvortrag - Hauptthema 8 CW and time-domain spectroscopy of semiconducting carbon nanotubes Tobias Hertel Vanderbilt University We present detailed CW and time-domain spectroscopic studies of surfactant stabilized nanotube suspensions consisting of individual tubes and small nanotube bundles. Poyldisperse nanotube samples are fractionated by tube diameter, metallicity and aggregate size in density gradients. Apart from the obvious benefit of this technique for tube type specific spectroscopic studies we also find that PL quantum yields of surfactant suspended tubes are at least a factor of 5 higher than what previous measurements in polydisperse samples suggested. Time resolved ensemble and single tube studies allow to identify mechanisms for non-radiative exciton decay and ground state recovery. We also compare isolated tubes with bundles of variable size where the character of excited states evolves from one dimensionally confined to more delocalized.
A Fr 18. 5. 2007, 17.30–17.50 9 Kurzvortrag - Hauptthema Tracing exciton formation and relaxation in (6,5) enriched single walled carbon nanotubes with sub-10 fs resolution Larry Lüer 1 , Calogero Sciascia 1 , Christoph Gadermaier 1,2 , Guglielmo Lanzani 1 , Jared Crochet 3 , and Tobias Hertel 3 (1) CNR-INFM, Dipartimento di Fisica, Politecnico di Milano, Milano, Italy (2) Department of Complex Matter, Joˇzef Stefan Institute, Ljubljana, Slovenia (3) Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA We perform pump and probe spectroscopy on (6,5) enriched single walled carbon nanotubes (obtained by the CoMoCat technique) with near-transform limited broadband visible pulses of 7 fs duration. Apart from the direct photogeneration of the E22 exciton, we find a delayed channel which is operative at higher pump intensities during the first 20 fs after photoexcitation. It results in i) a saturation of the maximum population of the E22 exciton and ii) a strong retardation of the relaxation kinetics of E22 into E11, that cannot be accounted for by considering regeneration of E22 states by annihilation of E11 states. We suggest free carrier recombination as origin of the delayed E22 formation channel. The G mode oscillation of the nanotubes is traced via coherent oscillations as function of probe wavelength. It exhibits an abrupt phase jump at the maximum of the E22 absorption band, clearly demonstrating the oscillation of the E22 transition energy exerted by the G mode vibrational distorsion. Mapping the oscillatory amplitudes and phases against probe wavelength allows us to separate oscillations in the ground state from those in the excited state.
Page 1 and 2: Bunsentagung 2007 Graz 106. Hauptve
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tron donor cytochrome c [3]. As an
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molecule. Furthermore, a dipole lay
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Au atoms on the MgO(001) surface. W
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porphyrin-coordinated metal ion and
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in the c-direction. This clearly in
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spectroscopic data will be discusse
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auf. Die elektrischen Eigenschaften
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increase in the damping of the quar
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[2] Y.-G. Guo, Y.-S. Hu, and J. Mai
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elektrochemischen in-situ Methoden
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Die Bildung von Blasen während ano
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der Kraftkonstante im Minimum des e
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erhöhte Reaktionsrate in denjenige
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Schaltzeiten möglich wird. Hierzu
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technique, a sharp tip is scanned o
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[1] T.W. Kim, R. Ryoo, K.P. Giersza
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applications. Controlled modificati
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(< 200 m 2 /g). In order to overcom
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[1] A. Bornschlegl and U. Boesl, Ch
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verlustes von Temperatur und Sauers
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complete trajectory of the oscillat
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tems for the study the behaviour of
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geben daher Aufschluss über die so
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chemically active Fe 3 O 4 support.
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while the opposite deposition order
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stimmen. Vergleiche mit dem Radius
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coordinated surface elements that a
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Particular attention is paid to how
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ermöglicht die Vorhersage der beob
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Here we report the influence of ads
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P Fr 18. 5. 2007, 18.30-22.00 100 P
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P Fr 18. 5. 2007, 18.30-22.00 107 P
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et al. in flüssigem Hexadecylamin
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P Fr 18. 5. 2007, 18.30-22.00 114 P
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P Fr 18. 5. 2007, 18.30-22.00 116 P
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P Fr 18. 5. 2007, 18.30-22.00 123 P
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P Fr 18. 5. 2007, 18.30-22.00 127 P
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propanol, attaches relatively stron
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[2] Mäkelä, R.; Vuolle, M. Journa
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from methane (Appearance Potential
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P Fr 18. 5. 2007, 18.30-22.00 132 P
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P Fr 18. 5. 2007, 18.30-22.00 133 P
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P Fr 18. 5. 2007, 18.30-22.00 135 P
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P Fr 18. 5. 2007, 18.30-22.00 136 P
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P Fr 18. 5. 2007, 18.30-22.00 138 P
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P Fr 18. 5. 2007, 18.30-22.00 140 P
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P Fr 18. 5. 2007, 18.30-22.00 141 P
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P Fr 18. 5. 2007, 18.30-22.00 143 P
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P Fr 18. 5. 2007, 18.30-22.00 144 P
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P Fr 18. 5. 2007, 18.30-22.00 146 P
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P Fr 18. 5. 2007, 18.30-22.00 148 P
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P Fr 18. 5. 2007, 18.30-22.00 150 P
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P Fr 18. 5. 2007, 18.30-22.00 152 P
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Index Ackermann P112 Adeagbo P79 Ad
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Fischer J.-H. P58, P60 Flechtner C8
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Koeppe B2 Köhler A. P116 Köhler M
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Paschek P145 Patchkovskii A21 Patzk
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Tran P17 Trettenhahn C28 Trimmel P7
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