Author/Authors :
McCarthy، M. J. نويسنده , , Walton، J. H. نويسنده , , Ropp، J. S. de نويسنده , , Shutov، M. V. نويسنده , , Goloshevsky، A. G. نويسنده , , Smith، R. L. نويسنده , , Collins، S. D. نويسنده ,
Abstract :
A double-tuned NMR microprobe with dual RF microcoil assemblies was fabricated and tested. The coils for the proton and X (low frequency) nuclei were a variant of a loop gap resonator and Helmholtz pair, respectively. 1-D 31P spectra of phosphoric acid and 13C-labeled spectra of methanol were recorded from 1.4-(mu)L samples. Signal was easily observable in one scan. A COSY spectrum of 13C-labeled acetic acid was acquired in ~1 h, demonstrating sufficient sensitivity to perform 2-D 13C direct detect experiments. Thus, the ability to obtain direct detection spectra of low-(gamma) nuclei is demonstrated.
