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Chapter 12 linewidth can be negative (to improve resolution), but the Gaussian linewidth must be positive. h( t ) = e − πWt − ( πWt ) 2 ln 2 Sinebell h(t ) = sin πt t max Cosine h(t ) = cos πt 2t max Hanning h( t ) = πt 1 1 + cos 2 t max Hamming h(t ) = 0.54 + 0.46 cos πt t max Kaiser 2 t I 0 πϑ 1 − t max h( t ) = I 0 ( πϑ ) where I0 is the zero-order modified Bessel function, and typical values of θ are 0.5-2.5. If you click the Update button in the dialog, the current weighting function and weighted FID will be displayed in the FID window. Spectrum processing 173
