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Related Experiment Video

Updated: Jul 11, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

Image of a sulfur atom.

F P Ottensmeyer, E E Schmidt, A J Olbrecht

    Science (New York, N.Y.)
    |January 12, 1973
    PubMed
    Summary

    Two-dimensional signal averaging revealed the sulfur atom in tetraacetoxymercurithiophene molecules. This technique enhances dark field electron microscopy images, making previously unseen atoms visible.

    Area of Science:

    • Materials Science
    • Chemistry
    • Microscopy

    Background:

    • Dark field electron microscopy is a powerful tool for visualizing molecular structures.
    • Resolving individual atoms within complex organic molecules can be challenging due to signal-to-noise limitations.

    Purpose of the Study:

    • To investigate the utility of two-dimensional signal averaging for enhancing atomic resolution in electron micrographs.
    • To visualize the sulfur atom in 2,3,4,5-tetraacetoxymercurithiophene molecules.

    Main Methods:

    • Acquisition of dark field electron micrographs of 2,3,4,5-tetraacetoxymercurithiophene.
    • Application of two-dimensional signal averaging to a set of 64 individual micrographs.
    • Photographic superposition of individual images to create a composite image.

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    Main Results:

    • Single micrographs primarily showed images of mercury atoms.
    • The composite image, generated through signal averaging, clearly revealed the presence and location of the sulfur atom.
    • Enhanced signal-to-noise ratio allowed for the visualization of lighter elements.

    Conclusions:

    • Two-dimensional signal averaging significantly improves the visibility of atoms in electron microscopy.
    • This technique enables the detection of elements like sulfur, which are difficult to resolve individually.
    • Signal averaging is a valuable method for advancing molecular imaging and structural analysis.