dorsal/arxiv
View SchemaA Quantum Yield Map for Synthetic Eumelanin
| Authors | Stephen Nighswander-Rempel, Jennifer Riesz, Joel Gilmore, Paul Meredith |
|---|---|
| Categories | |
| ArXiv ID | physics/0505202 |
| URL | https://arxiv.org/abs/physics/0505202 |
| DOI | 10.1063/1.2075147 |
Abstract
The quantum yield of synthetic eumelanin is known to be extremely low and it has recently been reported to be dependent on excitation wavelength. In this paper, we present quantum yield as a function of excitation wavelength between 250 and 500 nm, showing it to be a factor of 4 higher at 250 nm than at 500 nm. In addition, we present a definitive map of the steady-state fluorescence as a function of excitation and emission wavelengths, and significantly, a three-dimensional map of the specific quantum yield: the fraction of photons absorbed at each wavelength that are subsequently radiated at each emission wavelength. This map contains clear features, which we attribute to certain structural models, and shows that radiative emission and specific quantum yield are negligible at emission wavelengths outside the range of 585 and 385 nm (2.2 and 3.2 eV), regardless of excitation wavelength. This information is important in the context of understanding melanin biofunctionality, and the quantum molecular biophysics therein.
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"abstract": "The quantum yield of synthetic eumelanin is known to be extremely low and it\nhas recently been reported to be dependent on excitation wavelength. In this\npaper, we present quantum yield as a function of excitation wavelength between\n250 and 500 nm, showing it to be a factor of 4 higher at 250 nm than at 500 nm.\nIn addition, we present a definitive map of the steady-state fluorescence as a\nfunction of excitation and emission wavelengths, and significantly, a\nthree-dimensional map of the specific quantum yield: the fraction of photons\nabsorbed at each wavelength that are subsequently radiated at each emission\nwavelength. This map contains clear features, which we attribute to certain\nstructural models, and shows that radiative emission and specific quantum yield\nare negligible at emission wavelengths outside the range of 585 and 385 nm (2.2\nand 3.2 eV), regardless of excitation wavelength. This information is important\nin the context of understanding melanin biofunctionality, and the quantum\nmolecular biophysics therein.",
"arxiv_id": "physics/0505202",
"authors": [
"Stephen Nighswander-Rempel",
"Jennifer Riesz",
"Joel Gilmore",
"Paul Meredith"
],
"categories": [
"physics.chem-ph"
],
"doi": "10.1063/1.2075147",
"title": "A Quantum Yield Map for Synthetic Eumelanin",
"url": "https://arxiv.org/abs/physics/0505202"
},
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