Back to Search
Start Over
Double-quantum homonuclear correlation magic angle sample spinning nuclear magnetic resonance spectroscopy of dipolar-coupled quadrupolar nuclei.
- Source :
-
Journal of Chemical Physics . 2/8/2004, Vol. 120 Issue 6, p2835-2845. 11p. 2 Diagrams, 2 Charts, 8 Graphs. - Publication Year :
- 2004
-
Abstract
- A double-quantum homonuclear correlation nuclear magnetic resonance experiment for dipolar-coupled half-integer quadrupolar nuclei in solids is presented. The experiment is based on rotary resonance dipolar recoupling and uses bracketed spin-lock pulses to excite double-quantum coherence and later to convert it to the zero-quantum one. A central-transition-selective π pulse at the beginning of the t[sub 1] evolution period differentiates coherence transfer pathways of double-quantum coherences arising from coupled spins and from a single spin, so that the latter can be efficiently filtered out by phase cycling. The experiment was tested on an aluminophosphate molecular sieve AlPO[sub 4]-14, a material with a variety of aluminum quadrupolar coupling constants, isotropic chemical shifts and homonuclear distances. In a two-dimensional spectrum aluminum dipolar couplings with internuclear distances between 2.9 and 5.5 Å were resolved. Although the experiment requires an application of weak radio-frequency fields, frequency offsets did not affect its performance crucially. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CELL nuclei
*QUANTUM theory
*CHEMISTRY
*PHYSICS
*PHYSICAL sciences
*SCIENCE
Subjects
Details
- Language :
- English
- ISSN :
- 00219606
- Volume :
- 120
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Journal of Chemical Physics
- Publication Type :
- Academic Journal
- Accession number :
- 12202198
- Full Text :
- https://doi.org/10.1063/1.1638741