Peak-to-background Ratio in EELS
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Similar to EDS spectra, the peak-to-background ratio (P/B ratio) in EELS spectra increase with the accelerating voltages from 100 kV to 400 kV, resulting in an increase in the detection sensitivity of any trace elements.

The P/B ratio in EELS also varies with specimen thickness. For instance, Figure 3413 shows that the background increases dramatically with increase of the thickness of TEM specimen, while the signal of Pt M4,5 edge decreases significantly. The highest signal in the range of these TEM specimen thicknesses for Pt occurs at 20 nm.

EELS of Pt M4,5 edg

Figure 3413. EELS of Pt M4,5 edge.