X-ray continuum Increase beam energy Max continuum energy increases (short λ limit decreases) Intensity at given energy increases Intensity is a function of Z and photon energy Kramers' Law I (continuum) ~ i p Z (E 0 –E v )/E v i p = probe current Z = atomic # E 0 = beam energy E v = continuum photon energy Background intensity is a determining factor in detection limits
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