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Related Concept Videos

Scanning Electron Microscopy01:07

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Published on: May 28, 2016

Single electron counting by self-scanning diode array in a Kron camera.

S B Mende, F H Chaffee

    Applied Optics
    |February 23, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates a 512-element diode array in a Kron tube can resolve single photoelectrons for high-resolution spectroscopy of faint objects, with minimal signal-to-noise ratio loss.

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    Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2

    Published on: December 8, 2016

    Area of Science:

    • Spectroscopy
    • Electron Optics
    • Detector Technology

    Background:

    • Kron camera tubes offer a demountable design for photocathode and electron focal plane separation.
    • Diode arrays are crucial for high-resolution signal detection in advanced imaging.

    Purpose of the Study:

    • To evaluate the performance of a linear self-scanning diode array within a Kron camera tube.
    • To assess the feasibility of resolving single photoelectron events for spectroscopic applications.

    Main Methods:

    • A 512-element diode array was integrated into the electron optical focal plane of a demountable Kron camera tube.
    • The array was subjected to photoelectron bombardment with electron energies ranging from 30 keV to 35 keV.
    • Video signal amplitude distributions were analyzed to differentiate single electron events from background noise.

    Main Results:

    • The study successfully resolved the signal amplitude distributions of single electrons from those with no photoelectrons.
    • The signal-to-noise ratio (SNR) impairment due to imperfect resolution was found to be minimal, representing only a few percent loss of photoelectrons.
    • The performance indicates high fidelity in detecting individual photoelectron events.

    Conclusions:

    • The tested diode array Kron tube system demonstrates excellent potential for high-resolution spectroscopy.
    • The technology is well-suited for the analysis of extremely faint astronomical or scientific objects.
    • Immediate application in spectrographic analysis of faint targets is encouraged.