The instrument used here is K alpha which is summarized here.
Several other instruments are available from various vendors. Probably the most powerful instruments are created by users and ideally high intensity, high resolution (narrow bandwidth) X-ray sources are prefered choices therefore best instruments are at synchrotrons.
From commercial sources I list here in alphabetical order some providers :
Jeol
Kratos Analytical
Physical Electronics (PHI)
Thermo Scientific