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  2. Molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Molecular_geometry

    Some common shapes of simple molecules include: Linear: In a linear model, atoms are connected in a straight line. The bond angles are set at 180°. For example, carbon dioxide and nitric oxide have a linear molecular shape. Trigonal planar: Molecules with the trigonal planar shape are somewhat triangular and in one plane (flat). Consequently ...

  3. High-resolution transmission electron microscopy - Wikipedia

    en.wikipedia.org/wiki/High-resolution...

    The aperture function cuts off beams scattered above a certain critical angle (given by the objective pole piece for ex), thus effectively limiting the attainable resolution. However it is the envelope function E(u) which usually dampens the signal of beams scattered at high angles, and imposes a maximum to the transmitted spatial frequency ...

  4. Scanning transmission electron microscopy - Wikipedia

    en.wikipedia.org/wiki/Scanning_transmission...

    A scanning transmission electron microscope (STEM) is a type of transmission electron microscope (TEM). Pronunciation is [stɛm] or [ɛsti:i:ɛm]. As with a conventional transmission electron microscope (CTEM), images are formed by electrons passing through a sufficiently thin specimen. However, unlike CTEM, in STEM the electron beam is focused ...

  5. Immune electron microscopy - Wikipedia

    en.wikipedia.org/wiki/Immune_electron_microscopy

    When electrons pass through the microscope, they hit this gold particle. The dense gold atom reflects the electrons being emitted from the electron microscope and causes the appearance of the target particle within the specimen. [1] Another possible process involves Protein A, which is derived from a bacterium. It permanently coats the gold ...

  6. Atomic force microscopy - Wikipedia

    en.wikipedia.org/wiki/Atomic_force_microscopy

    For imaging, the reaction of the probe to the forces that the sample imposes on it can be used to form an image of the three-dimensional shape (topography) of a sample surface at a high resolution. This is achieved by raster scanning the position of the sample with respect to the tip and recording the height of the probe that corresponds to a ...

  7. Scanning helium microscopy - Wikipedia

    en.wikipedia.org/wiki/Scanning_helium_microscopy

    Geometry of a scanning helium microscope in its zone plate configuration showing the variables used in this article. Image taken from [27] (uploaded by the author). The zone plate microscope uses a zone plate (that acts roughly like as a classical lens) instead of a pinhole to focus the atom beam into a small focal spot. This means that the ...

  8. Low-energy electron microscopy - Wikipedia

    en.wikipedia.org/wiki/Low-energy_electron_microscopy

    A low-energy electron microscope used for surface science studies at University of Illinois' Frederick Seitz Materials Research Laboratory in Urbana, IL, USA. Low-energy electron microscopy, or LEEM, is an analytical surface science technique used to image atomically clean surfaces, atom-surface interactions, and thin (crystalline) films. [1]

  9. Shape factor (image analysis and microscopy) - Wikipedia

    en.wikipedia.org/wiki/Shape_factor_(image...

    The dimensionless quantities often represent the degree of deviation from an ideal shape, such as a circle, sphere or equilateral polyhedron. [1] Shape factors are often normalized, that is, the value ranges from zero to one. A shape factor equal to one usually represents an ideal case or maximum symmetry, such as a circle, sphere, square or cube.

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