The X-Ray Spectrum (Changes in Voltage) The continuous spectrum is from electrons decelerating rapidly in the targe and transferring their energy to single photons,Bremsstrahlung. E=ev V.peak voltage across the X-ray tube The characteristic lines are a result of electrons ejecting orbital electrons from the innermost shells.When electrons from outer shells fall down to the level of the inner ejected electron,they emit a photon with an energy that is characteristic to the atomic transition. Changes in the voltage: L When the voltage is increased: 200k 1)Emar os Vp 2)peak of continuous spectrum moves to higher energy 3)total output intensiryVp2 4)more characteristic lines may appear 100 200