Background
is Extrinsic Noise
Spectrum Background Noise  (produced by inelastically scattering of photo-electrons)
Spectrum Background Noise is an Extrinsic effect. Not part of any Intrinsic Effects.
Extrinsic Background Noise  (produced by inelastically scattered photo-electrons – gray zone)
Anatomy of a Survey Spectrum of pure Carbon (HOPG)
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