E Ka 1 = W K À W L III due to K to L III transition
and E Ka 2 = W K À W L II due to K to L II transition
where k K a 1
ð Þ¼ 1.54051 ˚
A
and k K a 2
ð Þ¼ 1.54433 ˚
A
Thus to excite K radiation from the target material, for example, the bombarding electrons must have the energy equal to W K . Therefore,
Fig. 7.1 X-ray spectra of
tungsten at various
accelerating potentials
Fig. 7.2 Electron orbits in an
atom, showing transitions
associated with the production
of characteristics X-rays
264
7 Diffraction of Waves and Particles by Crystal
and E Ka 2 = W K À W L II due to K to L II transition
where k K a 1
ð Þ¼ 1.54051 ˚
A
and k K a 2
ð Þ¼ 1.54433 ˚
A
Thus to excite K radiation from the target material, for example, the bombarding electrons must have the energy equal to W K . Therefore,
Fig. 7.1 X-ray spectra of
tungsten at various
accelerating potentials
Fig. 7.2 Electron orbits in an
atom, showing transitions
associated with the production
of characteristics X-rays
264
7 Diffraction of Waves and Particles by Crystal