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Intrinsic Fluorescence of Monomeric Chlorophyll-α at 674 nm: Stokes Shift–Linewidth Equivalence and the Vibronic Regime

Author:

Peled, Aaron

Category:

Research Papers

Sub-Category:

Biology / Medicine

Language:

English

Date Published:

April 20, 2026

File:

/Research Papers-Biology / Medicine/Download/10524

Downloads:

Keywords:

Monomeric Chl-α, Intrinsic Fluorescence, Stokes shift, Homogeneous linewidth, Qy transition.

Abstract:

Chlorophyll-α (Chl-α) fluoresces at 674 nm under monomeric conditions in ethanol, exhibiting a reproducible emission peak with a narrow homogeneous linewidth. This study analyzes the spectral parameters of this fluorescence using vibronic theory, interpreting the observed emission as resulting from an intrinsic balance between vibronic coupling and environmental dephasing. The near-equality of the Stokes shift and homogeneous linewidth, both ≈ 0.04 ???????? are treated as an empirical relation, suggesting that the same low-frequency environmental modes influence both nuclear relaxation and dephasing. The Huang–Rhys factor ???? ≈ 0.225 supports weak-to- intermediate vibronic coupling of the Qy excited state, placing Chl-α in a regime compatible with efficient energy transfer in photosynthetic systems. This work not only elucidates the spectroscopic properties of monomeric Chl-α but also provides a molecular baseline for determining how protein environments modulate spectral behavior and energy transfer.

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