Multiplet-Matched Filtering of 103Rh Signal Using Information Contained in 31P Spectrum of AA′XX′ 31P–103Rh Spin System

Splitting parameters measured in the sensitive 31P part of an AA′XX′ 31P–103Rh spectrum make it possible to perform a multiplet-matched digital filtering of the weak 103Rh free induction decay signal. Compared to the conventional matched exponential weighting, this multiplet-matched filtering has provided a gain of 1.8 ± 0.4 in the signal-to-noise ratio of the experimental rhodium spectrum. The maximum gain predicted theoretically is equal to 2.