Abstract
A novel soft X-ray and optical short-pulse double resonance spectroscopic technique tailor-made to elucidate processes involving the optically forbidden S 1 (2 1A g) state of carotenoids in native biological samples (e.g., photosynthetic antenna complexes) is described. The principle relies on probing the near carbon K-edge absorption of the optically excited sample with soft X-rays generated by a laser-induced plasma. A first application concerns location of the 2 1A g state of β-carotene in vitro. Further applications are proposed.
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