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Issue 25, 2010
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Branching relaxation pathways from the hot S2 state of 8′-apo-β-caroten-8′-al

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Abstract

We present infrared and visible transient absorption measurements of 8′-apo-β-caroten-8′-al following one-photon excitation at 405 nm. An excess vibrational energy of ∼4000 cm−1 in the S2 state is created with 405 nm excitation. Relaxation from this vibronic region shows distinct relaxation pathways from those observed for 490 nm excitation which excites S2 near its origin. Infrared and visible transient absorption measurements show long-lived transient signals that persist longer than 1 ns. These transient spectra are identical to those observed in previous two-photon excitation measurements at 1275 nm. Our results are consistent with at least two minima on the S1 surface and a branched decay from hot S2 molecules to at least two of these minima.

Graphical abstract: Branching relaxation pathways from the hot S2 state of 8′-apo-β-caroten-8′-al

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Publication details

The article was received on 29 Jan 2010, accepted on 01 Apr 2010 and first published on 06 May 2010


Article type: Paper
DOI: 10.1039/C001322F
Phys. Chem. Chem. Phys., 2010,12, 6782-6788

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    Branching relaxation pathways from the hot S2 state of 8′-apo-β-caroten-8′-al

    Y. Pang and G. R. Fleming, Phys. Chem. Chem. Phys., 2010, 12, 6782
    DOI: 10.1039/C001322F

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