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Researchers developed a new method using scanning tunneling microscopy to record molecular probability distributions, enabling direct measurement of thermodynamic quantities for single molecules. This technique allows for information encoding and decoding via temperature modulation.

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Area of Science:

  • Thermodynamics
  • Single-molecule physics
  • Materials science

Background:

  • Ensemble averaging is crucial for determining thermodynamic quantities.
  • Single-molecule studies at equilibrium face challenges in determining free energy, entropy, and enthalpy using only ensemble averaging.
  • Directly recording time-averaged equilibrium probability distributions is needed.

Purpose of the Study:

  • To develop a method for directly recording time-averaged equilibrium probability distributions of single molecules.
  • To assess real-space-projected thermodynamic quantities using these distributions.
  • To explore the potential for encoding and decoding information using position-temperature space.

Main Methods:

  • Confining individual molecules to a nanoscopic pore within a two-dimensional metal-organic nanomesh.
  • Utilizing temperature-controlled scanning tunneling microscopy for direct recording of probability distributions.
  • Associating distributions with partition function projections and employing computational modeling for analysis.
  • Using molecular dynamics-based analysis to reproduce experimentally observed projected microstates.
  • Customizing in silico energy landscapes to demonstrate temperature-dependent probability distributions.

Main Results:

  • Successfully recorded time-averaged equilibrium probability distributions for single molecules.
  • Accurately reproduced experimentally observed projected microstates using molecular dynamics-based analysis.
  • Demonstrated that distinct probability distributions can be encrypted at different temperatures by customizing energy landscapes.
  • Showcased the ability to encode and decode information into position-temperature space.

Conclusions:

  • The developed method enables direct measurement of thermodynamic quantities for single molecules.
  • Computational modeling and molecular dynamics are powerful tools for analyzing single-molecule experimental data.
  • The ability to modulate probability distributions with temperature opens new avenues for information storage and retrieval at the molecular level.