K-alpha is typically by far the strongest X-ray spectral line for an element bombarded with energy sufficient to cause maximally intense X-ray emission.

Molybdenum - Absorbs Bremsstrahlung - Leaving K-Beta & K-Alpha.

Twin spectroheliographs giving 6 cm diameter full disc photographs of the Sun in K-alpha and H-alpha spectral lines are in regular use.

The two prism K-alpha spectroheliographs were acquired in 1904 and the H-alpha Diffraction grating spectroheliograph was operational in 1911.

Thus, Moseley's two given formulae for K-alpha and L-alpha lines, in his original semi-Rydberg style notion, (squaring both sides for clarity), are:

At best, it can make predictions about the K-alpha and some L-alpha X-ray emission spectra for larger atoms, if two additional ad hoc assumptions are made (see Moseley's law above).

Monochromatic aluminium K-alpha X-rays are normally produced by diffracting and focusing a beam of non-monochromatic X-rays off of a thin disc of natural, crystalline quartz with a orientation.

A K-alpha, or K, line analogous to the Lyman-alpha line for hydrogen, occurs in the high-energy induced emission spectra of all chemical elements, since it results from the same electron transition as in hydrogen.

When using high energy resolution experiment settings on an XPS equipped with a monochromatic Al K-alpha X-ray source, the FWHM of the major XPS peaks range from 0.3 eV to 1.7 eV.