Nuclear Double Resonance in the Rotating Frame

@article{citeulike:2099140, abstract = {A double nuclear resonance spectroscopy method is introduced which depends upon effects of magnetic dipole-dipole coupling between two different nuclear species. In solids a minimum detectability of the order of 10 14 to 10 16 nuclear Bohr magnetons/cc of a rare b nuclear species is predicted; to be measured in terms of the change in a strong signal displayed by an abundant a nuclear species. The a magnetization is first oriented by a strong radio-frequency field in the frame of reference rotating at its Larmor frequency. The b nuclear resonance is obtained simultaneously with a second radio-frequency field; and with the condition that the a and b spins have the same Larmor frequencies in their respective rotating frames; a cross relaxation will occur between the two spin systems. The cross-relaxation interaction; which lasts for the order of a long spin-lattice relaxation time of the a magnetization; is arranged to produce a cumulative demagnetization of the a system when maximum sensitivity is desired. Final observation of the reduced a magnetization indicates the nuclear resonance of the b system. The concepts of uniform spin temperature; when it is valid; and of nonuniform spin temperature where spin diffusion is important; are applied. The density matrix method formulates the double resonance interaction rate in second order. Preliminary tests of the double resonance effect are carried out with a nuclear quadrupole system.}, author = {Hartmann, S. R. and Hahn, E. L. }, citeulike-article-id = {2099140}, doi = {10.1103/PhysRev.128.2042}, journal = {Physical Review}, keywords = {cp, nmr, solid-state}, month = {December}, number = {5}, pages = {2042+}, posted-at = {2007-12-12 15:33:10}, priority = {2}, publisher = {American Physical Society}, title = {Nuclear Double Resonance in the Rotating Frame}, url = {http://dx.doi.org/10.1103/PhysRev.128.2042}, volume = {128}, year = {1962} }

TY - JOUR ID - citeulike:2099140 L3 - citeulike-article-id:2099140 TI - Nuclear Double Resonance in the Rotating Frame JF - Physical Review VL - 128 IS - 5 SP - 2042 PB - American Physical Society N2 - A double nuclear resonance spectroscopy method is introduced which depends upon effects of magnetic dipole-dipole coupling between two different nuclear species. In solids a minimum detectability of the order of 10 14 to 10 16 nuclear Bohr magnetons/cc of a rare b nuclear species is predicted; to be measured in terms of the change in a strong signal displayed by an abundant a nuclear species. The a magnetization is first oriented by a strong radio-frequency field in the frame of reference rotating at its Larmor frequency. The b nuclear resonance is obtained simultaneously with a second radio-frequency field; and with the condition that the a and b spins have the same Larmor frequencies in their respective rotating frames; a cross relaxation will occur between the two spin systems. The cross-relaxation interaction; which lasts for the order of a long spin-lattice relaxation time of the a magnetization; is arranged to produce a cumulative demagnetization of the a system when maximum sensitivity is desired. Final observation of the reduced a magnetization indicates the nuclear resonance of the b system. The concepts of uniform spin temperature; when it is valid; and of nonuniform spin temperature where spin diffusion is important; are applied. The density matrix method formulates the double resonance interaction rate in second order. Preliminary tests of the double resonance effect are carried out with a nuclear quadrupole system. KW - cp KW - nmr KW - solid-state AU - Hartmann, SR AU - Hahn, EL PY - 1962/12/01/ UR - http://dx.doi.org/10.1103/PhysRev.128.2042 ER -