X-ray
X-rays are high-energy photons. They can be used for scattering experiments, because their wavelike nature causes interference from scattered radiation. Their small wavelength makes them ideal for probing small length-scales (atomic, molecular, and nano), while their high-energy allows them to penetrate through samples.
Production
X-rays can be generated in labscale instruments; e.g. using a rotating anode (see Cu K-alpha). High-flux x-ray beams can be generated using synchrotrons.