Charge Transfer Reactions from I^- to Polar Protic Solvents Studied Using Ultrafast Extreme Ultraviolet Photoelectron...

Area of Science:

• Physical Chemistry
• Chemical Physics
• Spectroscopy

Background:

• Understanding charge transfer reactions in solvents is crucial for chemical dynamics.
• Previous time-resolved photoelectron spectroscopy (TRPES) methods suffered from spectral broadening due to electron inelastic scattering in liquids.
• Solvation and thermalization dynamics of electrons play key roles in chemical reactions.

Purpose of the Study:

• To investigate charge transfer reactions from iodide ions (I-) to water, methanol, and ethanol.
• To utilize extreme ultraviolet time-resolved photoelectron spectroscopy (EUV-TRPES) to overcome spectral broadening limitations.
• To elucidate the temporal evolution of electron binding energy distributions and subsequent processes.

Main Methods:

• Employing extreme ultraviolet time-resolved photoelectron spectroscopy (EUV-TRPES).
• Analyzing electron binding energy distributions, including peak position, width, and intensity.
• Applying a diffusion equation and global fitting analysis based on a kinetics model for geminate recombination.

Main Results:

• EUV-TRPES enabled clear observation of spectral shape evolution, free from inelastic scattering broadening.
• The study tracked electron detachment, solvation, and thermalization processes.
• Geminate recombination dynamics between electrons and iodine atoms were analyzed.

Conclusions:

• EUV-TRPES is a powerful technique for studying ultrafast charge transfer in liquids.
• The research provides detailed insights into electron dynamics following charge transfer in various alcohol solvents.
• The findings contribute to a fundamental understanding of electron solvation and recombination mechanisms.