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  2. X-ray background - Wikipedia

    en.wikipedia.org/wiki/X-ray_background

    The galactic X-ray background is produced largely by emission from hot gas in the Local Bubble within 100 parsecs of the Sun. Deep surveys with X-ray telescopes, such as the Chandra X-ray Observatory , have demonstrated that around 80% of the cosmic X-ray background is due to resolved extra-galactic X-ray sources, the bulk of which are ...

  3. X-ray laser - Wikipedia

    en.wikipedia.org/wiki/X-ray_laser

    This article describes the x-ray lasers in plasmas, only. The plasma x-ray lasers rely on stimulated emission to generate or amplify coherent , directional, high-brightness electromagnetic radiation in the near X-ray or extreme ultraviolet region of the spectrum, that is, usually from ~3 nanometers to several tens of nanometers (nm) wavelength .

  4. Moiré pattern - Wikipedia

    en.wikipedia.org/wiki/Moiré_pattern

    A universal moiré effect and application in X-ray phase-contrast imaging "The Moiré Effect Lights That Guide Ships Home", an article on YouTube by Tom Scott about the Moiré Inogon light in Southampton "The Moiré Museum", interactive vector graphics with links to the physics and mathematics of the Moiré effect and artistic contributions

  5. Free-electron laser - Wikipedia

    en.wikipedia.org/wiki/Free-electron_laser

    The lack of mirror materials that can reflect extreme ultraviolet and x-rays means that X-ray free electron lasers (XFEL) need to work without a resonant cavity. Consequently, in an X-ray FEL (XFEL) the beam is produced by a single pass of radiation through the undulator. This requires that there be enough amplification over a single pass to ...

  6. X-ray emission spectroscopy - Wikipedia

    en.wikipedia.org/wiki/X-ray_emission_spectroscopy

    X-ray emission spectroscopy (XES) is a form of X-ray spectroscopy in which a core electron is excited by an incident x-ray photon and then this excited state decays by emitting an x-ray photon to fill the core hole. The energy of the emitted photon is the energy difference between the involved electronic levels.

  7. Characteristic X-ray - Wikipedia

    en.wikipedia.org/wiki/Characteristic_X-ray

    However, X-ray science has special terminology to describe the transition of electrons from upper to lower energy levels: traditional Siegbahn notation, or alternatively, simplified X-ray notation. In Siegbahn notation, when an electron falls from the L shell to the K shell, the X-ray radiation emitted is called a K-alpha (Kα) emission.

  8. X-ray - Wikipedia

    en.wikipedia.org/wiki/X-ray

    Natural color X-ray photogram of a wine scene. Note the edges of hollow cylinders as compared to the solid candle. William Coolidge explains medical imaging and X-rays.. An X-ray (also known in many languages as Röntgen radiation) is a form of high-energy electromagnetic radiation with a wavelength shorter than those of ultraviolet rays and longer than those of gamma rays.

  9. X-ray reflectivity - Wikipedia

    en.wikipedia.org/wiki/X-ray_reflectivity

    X-ray reflectivity (sometimes known as X-ray specular reflectivity, X-ray reflectometry, or XRR) is a surface-sensitive analytical technique used in chemistry, physics, and materials science to characterize surfaces, thin films and multilayers.

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