Physics of X-Rays

The X-ray region is normally considered to be that part of the electromagnetic spectrum lying between 0.1-100 Å, being bounded by the γ-ray region to the short wavelength side and the vacuum ultra-violet region to the long wavelength side. The actual boundary between the X-ray and vacuum ultra-violet region is not clearly defined and for many years the 50–500 Å mid-region has not been exploited by practical spectroscopists to any great degree. Over the last few years however this wavelength range has been examined both from the short wavelength end by the X-ray spectroscopist and from the long wavelength end by workers in the fields of plasma and astrophysics. It is now common practice to refer to this particular region as the soft X-ray and vacuum ultra-violet region.

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