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  2. X-ray fluorescence - Wikipedia

    en.wikipedia.org/wiki/X-ray_fluorescence

    Figure 1: Physics of X-ray fluorescence in a schematic representation. When materials are exposed to short- wavelength X-rays or to gamma rays, ionization of their component atoms may take place. Ionization consists of the ejection of one or more electrons from the atom, and may occur if the atom is exposed to radiation with an energy greater ...

  3. X-ray crystallography - Wikipedia

    en.wikipedia.org/wiki/X-ray_crystallography

    As a rule of thumb, R free should be approximately the resolution in angstroms divided by 10; thus, a data-set with 2 Å resolution should yield a final R free ~ 0.2. Chemical bonding features such as stereochemistry, hydrogen bonding and distribution of bond lengths and angles are complementary measures of the model quality.

  4. X-Ray (Amazon) - Wikipedia

    en.wikipedia.org/wiki/X-Ray_(Amazon)

    X-Ray is a reference tool, introduced in September 2011, [1] that is incorporated in the Amazon Kindle Touch and later models, Kindle apps for mobile platforms, Amazon Fire tablets, Fire TVs and Amazon Prime Video streaming apps, and the discontinued Fire Phone. On the Kindle, general reference information is preloaded into a small file on the ...