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Area of Science:

  • Physical Chemistry
  • Radiation Chemistry
  • Molecular Dynamics

Background:

  • Complex chemical and biochemical systems face damage from ionizing radiation.
  • The influence of the surrounding chemical environment (hydrophobic/hydrophilic domains) on radiation damage is not fully understood.
  • Understanding initial radiation response dynamics is crucial for mechanistic insights.

Purpose of the Study:

  • To investigate X-ray induced charge delocalization and proton dynamics in amphiphilic molecules.
  • To explore these dynamics on the femtosecond timescale in different chemical environments.
  • To utilize methanol as a model system for studying radiation effects in amphiphilic compounds.

Main Methods:

  • Acquisition of carbon and oxygen 1s Auger spectra for liquid methanol and d4-methanol.
  • Analysis of X-ray induced charge delocalization.
  • Investigation of proton dynamics on the few femtosecond timescale.

Main Results:

  • Observed X-ray induced charge delocalization and proton dynamics in liquid methanol.
  • Found a similar propensity for proton dynamics at both carbon and oxygen sites within the core-hole lifetime.
  • Demonstrated femtosecond timescale dynamics in a simple amphiphilic molecule.

Conclusions:

  • Methanol exhibits significant proton dynamics at both C and O sites following core excitation.
  • The findings suggest that proton dynamics are not confined to specific domains in simple amphiphiles.
  • This study provides a model for understanding radiation-induced decay processes in more complex amphiphilic systems.