Publication

The Occurrence of Non-Gaussian Spectral Line Shapes of Molecules in Electrostatically Disordered Media

Majed Chergui
2001
Journal Articles

Abstract

We calc. the effects of relatively strong elec. fields, corresponding to typical values for the fields inside glasses and proteins, on the spectroscopic properties of a simple two-level mol. Disorder in the elec. field strength is employed as a phys. source for inhomogeneous broadening. A striking result is that a Gaussian probability distribution for the field over the ensemble does not give rise to a Gaussian spectral line shape. The results are used to describe the absorption spectra of the B800 band of the B800-850 light-harvesting complex of photosynthetic purple bacteria. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/70b579f1-81ca-420c-abe4-06378543392b

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Majed Chergui
2001
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/70b579f1-81ca-420c-abe4-06378543392b

About this result

Related concepts (30)

Spectral line

A spectral line is a weaker or stronger region in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies. Spectral lines are often used to identify atoms and molecules. These "fingerprints" can be compared to the previously collected ones of atoms and molecules, and are thus used to identify the atomic and molecular components of stars and planets, which would otherwise be impossible.

Absorption spectroscopy

Absorption spectroscopy refers to spectroscopic techniques that measure the absorption of electromagnetic radiation, as a function of frequency or wavelength, due to its interaction with a sample. The sample absorbs energy, i.e., photons, from the radiating field. The intensity of the absorption varies as a function of frequency, and this variation is the absorption spectrum. Absorption spectroscopy is performed across the electromagnetic spectrum.

Photosynthetic reaction centre

A photosynthetic reaction center is a complex of several proteins, pigments and other co-factors that together execute the primary energy conversion reactions of photosynthesis. Molecular excitations, either originating directly from sunlight or transferred as excitation energy via light-harvesting antenna systems, give rise to electron transfer reactions along the path of a series of protein-bound co-factors. These co-factors are light-absorbing molecules (also named chromophores or pigments) such as chlorophyll and pheophytin, as well as quinones.

Related publications (3)

The Occurrence of Non-Gaussian Spectral Line Shapes of Molecules in Electrostatically Disordered Media

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