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Electronic Stark Effect in Isolated Ion Pairs.

Jeremy Donon1, Sana Habka1, Vanesa Vaquero-Vara1

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Researchers studied isolated molecular ion pairs to measure strong electric fields. This work enables calibration of molecular probes in gas-phase environments, mimicking conditions in condensed media.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Molecular Physics

Background:

  • Molecular probes are used to estimate local electric fields in condensed media.
  • Reported electric fields are often difficult to reproduce, limiting probe calibration.
  • Calibration is typically limited to fields below 0.1 GV m⁻¹.

Purpose of the Study:

  • To investigate gas-phase, isolated molecular ion pairs for electric field studies.
  • To chemically tune electric field intensity and monitor molecular response.
  • To demonstrate characterization of molecular probes in solvent-free, high-field environments.

Main Methods:

  • Utilized UV spectroscopy to monitor the response of a phenyl ring.
  • Investigated molecular ion pairs with the phenyl ring immersed in an electric field.
  • Chemically tuned electric field intensity (up to 1 GV m⁻¹) by varying cations.

Main Results:

  • Observed a quadratic Stark effect in the molecular ion pairs.
  • Demonstrated the feasibility of studying molecular probes in a solvent-free environment.
  • Showcased the ability to probe very large electric fields (1 GV m⁻¹ range).

Conclusions:

  • Molecular probes can be characterized in solvent-free conditions.
  • This method allows for calibration in the high electric field ranges relevant to condensed media.
  • Provides a pathway for understanding molecular behavior in extreme electric fields, such as in biological systems.