Peak, asymmetry height, definition

FIG. 16-32 Exponentially modified Gaussian peak with Xq/Gq = 1.5. The graph also shows the definition of the peak asymmetry factor at 10 percent of peak height. 

Figure 1.12. The 10% peak height definition of the asymmetry factor. The asymmetry factor is equal to the ratio A / B.

Peak asymmetry can also be measured using the U.S. Pharmacopoeia (USP) definition, which defines the first section of the peak as/and the peak width as the value at 5% of the peak height (see Figure 2.17) ... 

The observed asymmetry of a peak is measured by two parameters, the skewing factor a measured at 10 per cent of its height and the tailing factor TF measured at 5 per cent (for the definition of these terms, see Figure 1.4) ... 

Time averaging is symmetrical in time, which means that it will not induce asymmetry into an otherwise symmetrical input signal. Also, the peak height is not necessarily altered. The same is valid for pointwise time averaging, that is, the determination of the arithmetic mean of accumulated data during a given time interval at constant A. After this step the scan continues with a definite increment AA, accumulation starts at A + AA, etc. Both methods are applicable if the samples are stable and not damaged by radiation. 

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See also in sourсe #XX -- [ ]

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