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Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.

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Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
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Published on: October 13, 2011

Stretching single atom contacts at multiple subatomic step-length.

Yi-Min Wei1, Jing-Hong Liang, Zhao-Bin Chen

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China.

Physical Chemistry Chemical Physics : PCCP
|April 27, 2013
PubMed
Summary

This study reveals subatomic jumps in single-atom contacts during scanning tunneling microscopy experiments. These jumps, occurring at multiples of 0.075 nm, provide new insights into atomic-scale mechanics and conductance.

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Area of Science:

  • Surface Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Understanding atomic-scale mechanics is crucial for nanotechnology.
  • Single-atom contacts are fundamental building blocks in nanoscale devices.
  • Previous studies lacked detailed statistical analysis of atomic jump distances.

Purpose of the Study:

  • To investigate the statistical distribution of last-step lengths in single-atom contacts.
  • To explore the subatomic distances involved in atomic rearrangements.
  • To develop a model explaining the observed step-length behavior.

Main Methods:

  • Utilizing jump-to-contact scanning tunneling microscopy (STM) break junction technique.
  • Performing experiments on single-atom contacts of Iron (Fe) and Copper (Cu).
  • Analyzing last-step length histograms to identify discrete jumps.

Main Results:

  • Observed multiple peaks in last-step length histograms for Fe (up to five) and Cu (up to three).
  • Identified peaks at integral multiples close to 0.075 nm, a subatomic distance.
  • Demonstrated a novel statistical distribution of atomic jump lengths.

Conclusions:

  • Atomic rearrangements involve gliding between hollow sites on adjacent atomic planes.
  • Tip stretching plays a role in accommodating subatomic jumps.
  • The findings offer a new model for atomic-scale friction and contact mechanics.