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Published on: March 24, 2018
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High-Mobility Electrons in Aqueous Iodide Solutions
Fabio Novelli1, Adrian Buchmann1, Iqra Yousaf1
1Department of Physical Chemistry II, Ruhr University Bochum, Bochum 44801, Germany.
ACS Omega
|February 17, 2025
Summary
Two-photon absorption of iodide solutions generates delocalized electrons in water, differing from localized precursors. These electrons exhibit significantly higher mobility and diffusivity than relaxed solvated electrons.
Area of Science:
- Physical Chemistry
- Photochemistry
- Spectroscopy
Background:
- Photoexcitation of aqueous iodide solutions serves as a model for generating electrons in liquid water.
- One-photon excitation produces localized electron precursors near the parent ion.
Purpose of the Study:
- To investigate the nature of electrons generated via two-photon absorption in aqueous iodide solutions.
- To characterize the properties of these impulsively generated electrons using advanced spectroscopic techniques.
Main Methods:
- Transient absorption spectroscopy across terahertz, near-infrared, and visible frequencies.
- Utilizing ∼400 nm pulses for two-photon excitation.
- Employing transient terahertz spectroscopy for detailed analysis.
Main Results:
- Two-photon absorption impulsively generates short-lived (∼250 fs), delocalized electrons.
- These delocalized electrons are released further from the parent ion compared to one-photon excitation.
- Proposed electronic transitions (5p → 6p) suggest frustrated Rydberg orbitals or large radius excitons.
- Delocalized states exhibit electronic mobility and diffusivity approximately 500 times greater than relaxed electrons.
Conclusions:
- Two-photon excitation offers a distinct pathway to generate highly mobile, delocalized electrons in water.
- The observed delocalized states represent a unique transient species with significant implications for understanding electron dynamics in condensed phases.
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