We study the enhanced charge generation from higher excited states in a conjugated polymer via a modification of transient differential transmission spectroscopy. The first excited state S1 is reexcited via a second laser pulse towards a higher state Sn. The relaxation dynamics of Sn as well as the kinetics of the states created from Sn is revealed by a broad-band probe pulse. The push and probe durations below 20 fs allow the time-resolution of the Sn relaxation and enables us to identify the two main contributions to enhanced charge generation from S n, energy migration and vibrational relaxation. © 2003 Elsevier B.V. All rights reserved.
Dynamics of higher photoexcited states in m-LPPP probed with sub-20 fs time resolution
Gadermaier, C.;Cerullo, G.;Manzoni, C.;Lanzani, G.
2004-01-01
Abstract
We study the enhanced charge generation from higher excited states in a conjugated polymer via a modification of transient differential transmission spectroscopy. The first excited state S1 is reexcited via a second laser pulse towards a higher state Sn. The relaxation dynamics of Sn as well as the kinetics of the states created from Sn is revealed by a broad-band probe pulse. The push and probe durations below 20 fs allow the time-resolution of the Sn relaxation and enables us to identify the two main contributions to enhanced charge generation from S n, energy migration and vibrational relaxation. © 2003 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
