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Issue 21, 2016
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Spectral watermarking in femtosecond stimulated Raman spectroscopy: resolving the nature of the carotenoid S* state

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Abstract

A new method for recording femtosecond stimulated Raman spectra was developed that dramatically improves and automatizes baseline problems. Instead of using a narrowband Raman source, the experiment is performed using shaping of a broadband source. This allows locking the signal into carefully crafted watermarks that can be recovered from measured data with high fidelity. The approach uses unique properties of Raman scattering, thus allowing a direct recording of stimulated Raman signals with robust rejection of baselines and fixed-pattern-noise. Low cost technology for generating required pulse-shapes was developed and demonstrated. The methodology is applicable to any Raman experiment but primarily targets Femtosecond Stimulated Raman spectroscopy (FSRS) where a lack of robust methods for parasitic signal rejection has been a major obstacle in the practical development of the field in the last decade. The delivered improvement in FSRS experiments was demonstrated by recording evidence that the so-called S* state of carotenoids in solution corresponds to the optically forbidden S1 state of a sparsely populated carotenoid conformation.

Graphical abstract: Spectral watermarking in femtosecond stimulated Raman spectroscopy: resolving the nature of the carotenoid S* state

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Publication details

The article was received on 02 Mar 2016, accepted on 29 Apr 2016 and first published on 29 Apr 2016


Article type: Paper
DOI: 10.1039/C6CP01464J
Citation: Phys. Chem. Chem. Phys., 2016,18, 14619-14628
  • Open access: Creative Commons BY-NC license
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    Spectral watermarking in femtosecond stimulated Raman spectroscopy: resolving the nature of the carotenoid S* state

    M. Kloz, J. Weißenborn, T. Polívka, H. A. Frank and J. T. M. Kennis, Phys. Chem. Chem. Phys., 2016, 18, 14619
    DOI: 10.1039/C6CP01464J

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