peak-to-background ratio
peak-to-background ratio
The "peak-to-background ratio" is defined as the ratio of the peak intensity to the background intensity in a spectrum. (1) In an ELNES spectrum of EELS, the ratio is low because of its high-background signal. As the accelerating voltage of the incident electron beam is increased, the peak-to-background ratio is improved, because multiple scattering is decreased and the effective acceptance angle is increased. (2) In an EDS spectrum measured in a TEM, the ratio of the characteristic X-ray peak intensity to the background intensity is very high. When the accelerating voltage is increased, the ratio is further improved because the probability of bremsstrahlung (background) is decreased.
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