Issue 25, 2010

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

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

Article information

Article type
Paper
Submitted
29 Jan 2010
Accepted
01 Apr 2010
First published
06 May 2010

Phys. Chem. Chem. Phys., 2010,12, 6782-6788

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements