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Related Experiment Videos

Dynamics of individual atomic kinks during crystal dissolution

Magnussen1, Vogt

  • 1Abteilung Oberflachenchemie und Katalyse, Universitat Ulm, 89069 Ulm, Germany.

Physical Review Letters
|September 16, 2000
PubMed
Summary

Novel scanning tunneling microscopy directly observes atom removal and deposition during solid dissolution and crystallization. This reveals significant fluctuations at individual kinks during copper dissolution, providing direct kinetic measurements.

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Area of Science:

  • Surface science
  • Electrochemistry
  • Materials science

Background:

  • Solid dissolution and crystallization involve fundamental steps of atom removal and deposition.
  • Understanding kink dynamics is crucial for controlling these processes.
  • Direct observation of these atomic-scale dynamics has been challenging.

Purpose of the Study:

  • To directly observe and quantify the dynamics of kink motion during solid dissolution.
  • To investigate the role of atom removal/deposition at individual kinks.
  • To measure the kinetic properties of electrochemical reactions at the atomic level.

Main Methods:

  • Utilized a novel scanning tunneling microscopy (STM) technique.
  • Studied the electrochemical dissolution of Copper(100) in Hydrochloric acid (HCl) solution.

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  • Monitored local dissolution/redeposition fluctuations at individual kinks.

    • Main Results:

    • Observed pronounced local dissolution/redeposition fluctuations at individual kinks.
    • Detected these fluctuations even at the onset of copper dissolution.
    • Measured average kink propagation rates of approximately 10^3 atoms/s.
    • Measured average kink reaction rates in the range of 10^5 atoms/s.

    Conclusions:

    • The novel STM technique provides direct access to kink motion dynamics.
    • Electrochemical dissolution of Cu(100) exhibits significant atomic-level fluctuations.
    • This method allows for direct measurement of fundamental kinetic properties in electrochemical reactions.