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. 2010 Apr 26;11(4):1888–1929. doi: 10.3390/ijms11041888

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© 2010 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.

This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 21. — Schemes of relaxation processes when the set of Cars (n = 9–11) is coherently excited with ∼30 fs pulses to the 1B_u⁺(0) + X⁻(υ) diabatic pairs (for the notation of X⁻(υ), see the caption of Figure 19): The initial set of stimulated emissions can be explained in terms of quantum beat. In Car (n = 10), for example, it consists of (i) the persistent stimulated emission from the 1B_u⁺(0) + 1B_u⁻(2) diabatic pair as the coherent cross term, (ii) the short-lived 1B_u⁺(0) stimulated emission as one of the split incoherent terms and (iii) the short-lived 1B_u⁻(0) stimulated emission as the other split incoherent term. Also, the 1B_u⁺(0) species internally-converts to 1B_u⁻(2) and, then, vibrationally-relaxes to the 1B_u⁻(0) species, which gives rise to transient absorption. In Car (n = 11), 1B_u⁻(2) is replaced by 3A_g⁻(1) in (i) and (iii).