BANDWIDTH EXTENSION IN NOISE SPECTROSCOPY

Noise spectroscopy has previously been demonstrated to provide broad-b andwidth excitation with minimal applied RF field strengths. Nonethele ss, its application to broadline solid-state NMR spectroscopy has appe ared limited by the need to have unrealistically short probe- and rece iver-recovery times after pulses. In this Communication, we explain th eoretically and demonstrate experimentally that accurate lineshapes ca n be observed in H-2 solid-state NMR spectroscopy even where the probe ringdown time greatly exceeds the required time between sampled data points. Moreover, accurate lineshapes can be observed to +/- 125 MHz u sing RF fields as weak as a few hundred hertz. (C) 1998 Academic Press .