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Atomically resolved single-molecule triplet quenching.

Jinbo Peng1, Sophia Sokolov2, Daniel Hernangómez-Pérez3

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Researchers measured the triplet lifetime of single pentacene molecules, finding that nearby oxygen molecules significantly shorten it. This work enables control over molecular spin interactions for applications in advanced materials.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Molecular Physics

Background:

  • The nonequilibrium triplet state is crucial for applications like photocatalysis, organic photovoltaics, and photodynamic therapy.
  • Understanding and controlling molecular triplet states is essential for optimizing these technologies.

Purpose of the Study:

  • To directly measure the triplet lifetime of an individual pentacene molecule on an insulating surface with atomic resolution.
  • To investigate the effect of coadsorbed oxygen molecules on the triplet lifetime of pentacene.
  • To establish a correlation between molecular arrangements and triplet state quenching.

Main Methods:

  • Development and application of an electronic pump-probe method integrated with atomic force microscopy (AFM).
  • Utilizing single-molecule manipulation techniques for precise arrangement of pentacene and oxygen molecules.
  • Atomic-resolution characterization of molecular configurations and their impact on triplet lifetimes.

Main Results:

  • Direct measurement of the triplet lifetime of individual pentacene molecules achieved.
  • Significant quenching of the triplet lifetime observed when oxygen molecules are in close proximity to pentacene.
  • Precise correlation established between specific molecular arrangements and the degree of triplet state quenching.

Conclusions:

  • The study demonstrates a method for electrically addressing and controlling long-lived triplet states in single molecules.
  • Atomic-scale manipulation combined with lifetime measurements provides new insights into local spin-spin interactions.
  • This approach opens avenues for designing and controlling molecular properties for advanced quantum and materials applications.