Deconvolution and measurement of spin-spin splittings by modified J doubling in the frequency domain.
A new implementation of J doubling in the frequency domain is proposed. This modified J doubling uses novel sets of delta functions [..., +1, -1, +1, +1, -1, +1, ...] for in-phase multiplets and [..., -1, -1, -1, +1, +1, +1, ...] for antiphase multiplets. The convolution process together with the couplings found by it generates a deconvoluted multiplet that preserves the integral and the position of the original one. If the number of delta functions tends to infinity, the whole operation behaves like a formal deconvolution of the multiplet, which is a linear process. Modified J doubling allows for multistage procedures. This makes it possible to analyze 2D multiplets and to measure coupling constants as small as 0.11 Hz with an accuracy of +/-0.03 Hz.
Garza-García
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A
Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, D.F, 04510, México.
Ponzanelli-Velázquez
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G
del Río-Portilla F