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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.10903 |
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| _version_ | 1866912026361593856 |
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| author | Jędrak, Jakub Angulo, Gonzalo |
| author_facet | Jędrak, Jakub Angulo, Gonzalo |
| contents | When encountering complex fluorescence decays that deviate from exponentiality, a very appealing and powerful approach is to use lifetime (or equivalent rate constant) distributions. These are related by Laplace transform to multi-exponential functions, stretched exponentials, Becquerel's law, and others. In the case of bimolecular quenching, time-independent probability distributions of the rate constants have occasionally been used. Here we show that this mathematical formalism has a clear physical interpretation only when the fluorophore and quencher molecules are immobile, as in the solid state. However, such an interpretation is no longer possible once we consider the motion of fluorophores with respect to quenchers. Therefore, for systems in which the relative motion of fluorophores and quenchers cannot be neglected, it is not appropriate to use the time-independent continuous reaction rate or decay time distributions to describe, fit, or rationalize experimental results. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_10903 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Limitations of the rate-distribution formalism in describing luminescence quenching in the presence of diffusion Jędrak, Jakub Angulo, Gonzalo Chemical Physics When encountering complex fluorescence decays that deviate from exponentiality, a very appealing and powerful approach is to use lifetime (or equivalent rate constant) distributions. These are related by Laplace transform to multi-exponential functions, stretched exponentials, Becquerel's law, and others. In the case of bimolecular quenching, time-independent probability distributions of the rate constants have occasionally been used. Here we show that this mathematical formalism has a clear physical interpretation only when the fluorophore and quencher molecules are immobile, as in the solid state. However, such an interpretation is no longer possible once we consider the motion of fluorophores with respect to quenchers. Therefore, for systems in which the relative motion of fluorophores and quenchers cannot be neglected, it is not appropriate to use the time-independent continuous reaction rate or decay time distributions to describe, fit, or rationalize experimental results. |
| title | Limitations of the rate-distribution formalism in describing luminescence quenching in the presence of diffusion |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2405.10903 |