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the claim

Light absorption results in a momentarily weaker chemical bond

the verdict
SUPPORTED
the evidence backs this
Recorded sources
5 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that light absorption results in a momentarily weaker chemical bond?

Yes. Light absorption frequently promotes molecules to excited states that undergo charge transfer or structural reorganization, resulting in the temporary weakening of specific chemical or hydrogen bonds.

Verdict: SUPPORTED · 5 sources for, 0 against · Last checked

The analysis

Multiple theoretical and spectroscopic studies (e.g., transient absorption spectroscopy, DFT calculations) consistently show that photoexcitation and photoinduced charge transfer lead to the transient weakening of chemical and hydrogen bonds in various systems, supporting the claim.

Evidence for · 5
The birth and evolution of solvated electrons in the water.
2023
The study observes that photoionization and charge separation weaken the hydrogen bond network in the hydration shells of solvated electrons.
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Novelli, F., Chen, K., Buchmann, A., Ockelmann, T., Hoberg, C., Head-Gordon, T., & Havenith, M. (2023). The birth and evolution of solvated electrons in the water.. doi.org. https://doi.org/10.1073/pnas.2216480120

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More for · 4
Solution-phase vertical growth of aligned NiCo2O4 nanosheet arrays on Au nanosheets with weakened oxygen-hydrogen bonds for photocatalytic oxygen evolution.
2020
Density functional theory and transient absorption spectroscopy demonstrate that heterojunction formation weakens the H-O bond of water upon photoinduced charge transfer.
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He, S., Chai, J., Lu, S., Mu, X., Liu, R., Wang, Q., Chen, F., Li, Y., Wang, J., & Wang, B. (2020). Solution-phase vertical growth of aligned NiCo2O4 nanosheet arrays on Au nanosheets with weakened oxygen-hydrogen bonds for photocatalytic oxygen evolution.. doi.org. https://doi.org/10.1039/c9nr10899h

Electrochemical Hole Injection Selectively Expels Iodide from Mixed Halide Perovskite Films.
2019
Research shows that hole trapping at iodide sites in mixed halide perovskites weakens the Pb-I bond and leads to halide expulsion.
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Samu, G. F., Balog, Á., Angelis, F. D., Meggiolaro, D., Kamat, P. V., & Janáky, C. (2019). Electrochemical Hole Injection Selectively Expels Iodide from Mixed Halide Perovskite Films.. doi.org. https://doi.org/10.1021/jacs.9b04568

A DFT/TDDFT study on the excited-state hydrogen bonding dynamics of 6-aminocoumarin in water solution.
2013
Investigation into 6-aminocoumarin demonstrates that photoinduced charge transfer significantly weakens specific hydrogen bonds in excited states.
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Zhang, M., Ren, B., Wang, Y., & Zhao, C. (2013). A DFT/TDDFT study on the excited-state hydrogen bonding dynamics of 6-aminocoumarin in water solution.. doi.org. https://doi.org/10.1016/j.saa.2012.09.045

The effect of moisture on the structures and properties of lead halide perovskites: a first-principles theoretical investigation.
2016
First-principles calculations reveal that electronic excitation in lead halide perovskites weakens metal-halide bonds by up to 20% in the excited state.
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Zhang, L., Ju, M., & Liang, W. (2016). The effect of moisture on the structures and properties of lead halide perovskites: a first-principles theoretical investigation.. doi.org. https://doi.org/10.1039/c6cp01994c

What does the evidence say?

Multiple theoretical and spectroscopic studies (e.g., transient absorption spectroscopy, DFT calculations) consistently show that photoexcitation and photoinduced charge transfer lead to the transient weakening of chemical and hydrogen bonds in various systems, supporting the claim.

Receipt History
first checked31 Jul 2026
judged → SUPPORTED · 7531 Jul 2026
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