โ Scribed by Y. Hsieh; J.C. Koo; E.L. Hahn
No coin nor oath required. For personal study only.
A sensitive nuclear double reson,~.nce method enables measurement of naturally abundant 170 nuclear quadrupole resonance t_ransition frequencies in powdered o~anic compounds. The nuclear quadrupole parameters enable the identification of resonances from C=O, C-O-H, and C-O-C groups in a set of compounds.
The pure nuclear quadrupole resonance (NQR) of 170 in its natural abundance (0.037%) is obtained in powdered samples by a nuclear double resonan.ce method [1]. Oxygen-17 with nuclear spin I = 5/2 yields two principally allowed NQR transition fre-quenciesfm~rn, in zero magnetic field: f5/~3/2 and
๐ SIMILAR VOLUMES
## Abstract ^17^O chemical shifts of four amino acids at natural abundance have been obtained. Sensitivity was enhanced by accumulating a large number of scans or employing high concentrations at elevated temperature. Routine memory overflow was avoided by using a combination of solvent suppression
Goldman's spin-1/2 formalism has been used for describing the response of an I=3/2 spin system to a two-pulse sequence in a pure nuclear quadrupole resonance experiment. A detailed analysis of the polarization evolution and quadrupolar echo generation is carried out through the use of explicit expre
The double resonance pure quacirupolc spectrum of N,IAI~C~~ due to 23N.~, and around 1.89, 2.11. and 4.00 Ml11 due to -2&O displays four frcqucncy bands: around 1.33 \ItIz "0. The hither frequency b.md d~spl.~ys fmc structure that is mtcrpretcd in terms of the mtrdmolccular dlpolar mtcractton\ wlthm