FAIMS waveform bisinusoidal

Though FAIMS waveforms of all classes have been implemented with various / values (1 for the rectangular, 2-A for bisinusoidal,and 2.9-4.8 for... 

All comparisons in this section have assumed the ideal rectangular waveforms for both FAIMS (3.1.2) and HOD IMS. For FAIMS, the ideal F(t) provides higher Eq than the harmonic-based profiles by 2-2.2 times (3.1.3). Hence HOD IMS with the optimum F(t) would appear more effective by that factor if compared to commercial FAIMS using bisinusoidal or clipped This creates an allowance to use nonideal waveforms in HOD IMS and still meet the present benchmarks versus commercial FAIMS systems. 

Prieto, M. Tsai, C.W. Boumsellek, S. Ferran, R. Kaminsky, . Harris, S. Yost, R.A., Comparison of rectangular and bisinusoidal waveforms in a miniature planar FAIMS, Arud Chem. 2011, 83, 9237-9243. 

The quantity (F2) has been encountered in the formulas for average ion diffusion in FAIMS (3.1.2), which reflects the proportionality of diffusion coefhcient to ion temperature. Based on (F2) values for rectangular and bisinusoidal F t) with/=2 and clipped F t) with /= 2.51 that are optimum for K E/N) expansions tmncated to the first term (3.1.2 and 3.1.3), the maximum instantaneous Th at waveform peaks (Fn.max) exceeds Th by 2 times for the rectangular and 3.6 times for the harmonic-based F t). Profiles optimized for real K E/N) expansions including > 1 terms (3.1.4) may lead to somewhat lower or higher T H,max/ H values, depending on/by Equations 3.25 and 3.28. 

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