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Related Concept Videos

Atomic Emission Spectroscopy: Instrumentation01:22

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Atomic Emission Spectroscopy: Interference01:30

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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Three-dimensional Super Resolution Microscopy of F-actin Filaments by Interferometric PhotoActivated Localization Microscopy iPALM
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Orbiting stellar interferometer for astrometry and imaging.

M M Colavita, M Shao, M D Rayman

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    This summary is machine-generated.

    The Orbiting Stellar Interferometer (OSI) concept proposes a space interferometer for astrometry and imaging. It aims for high-precision measurements, enabling detailed astronomical observations from space.

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    Area of Science:

    • Space-based interferometry
    • Astrometry and astronomical imaging

    Background:

    • The Orbiting Stellar Interferometer (OSI) concept addresses recommendations for a space-based astrometric interferometer mission.
    • Developed at JPL, OSI is a triple Michelson interferometer with advanced optical components.

    Purpose of the Study:

    • To present two point designs for the OSI instrument.
    • To detail the astrometric and imaging capabilities of the proposed space interferometer.

    Main Methods:

    • Utilizes a triple Michelson interferometer design with articulating siderostats and optical delay lines.
    • Incorporates laser metrology and controlled-optics technology for high performance.
    • Two designs are presented: an 18-m baseline and a 7-m baseline version.

    Main Results:

    • The 18-m design targets 10 microarcsecond wide-field astrometric accuracy for 16th magnitude objects in 100s.
    • Achieves synthesis imaging resolution of 5 marcseconds, matching the diffraction limit.
    • The 7-m design offers a simpler deployment option.

    Conclusions:

    • The OSI concept provides a viable pathway for a first-generation space interferometer.
    • The proposed instrument is capable of unprecedented astrometric precision and imaging resolution.
    • OSI technology is feasible for future space-based astronomical observatories.